WO2023181104A1 - Matériau d'alliage de titane, matériau de fil d'alliage de titane, matériau de poudre d'alliage de titane et procédé de production de matériau d'alliage de titane - Google Patents

Matériau d'alliage de titane, matériau de fil d'alliage de titane, matériau de poudre d'alliage de titane et procédé de production de matériau d'alliage de titane Download PDF

Info

Publication number
WO2023181104A1
WO2023181104A1 PCT/JP2022/013076 JP2022013076W WO2023181104A1 WO 2023181104 A1 WO2023181104 A1 WO 2023181104A1 JP 2022013076 W JP2022013076 W JP 2022013076W WO 2023181104 A1 WO2023181104 A1 WO 2023181104A1
Authority
WO
WIPO (PCT)
Prior art keywords
less
titanium alloy
alloy material
phase
powder
Prior art date
Application number
PCT/JP2022/013076
Other languages
English (en)
Japanese (ja)
Inventor
健一 森
利行 奥井
Original Assignee
日本製鉄株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本製鉄株式会社 filed Critical 日本製鉄株式会社
Priority to PCT/JP2022/013076 priority Critical patent/WO2023181104A1/fr
Publication of WO2023181104A1 publication Critical patent/WO2023181104A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/25—Direct deposition of metal particles, e.g. direct metal deposition [DMD] or laser engineered net shaping [LENS]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/60—Treatment of workpieces or articles after build-up
    • B22F10/66—Treatment of workpieces or articles after build-up by mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y80/00—Products made by additive manufacturing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium

Definitions

  • the present invention relates to a titanium alloy material, a titanium alloy wire, a titanium alloy powder, and a method for producing a titanium alloy material.
  • Non-Patent Document 1 a new manufacturing method called three-dimensional additive manufacturing technology has been developed and is also being applied to metal materials.
  • Three-dimensional additive manufacturing technology is generally known as 3D printer technology, but recently it has been combined with various technologies that add materials sequentially to obtain three-dimensional shapes and manufacture practical parts such as industrial products. (AM, additive manufacturing) technology is attracting attention all over the world.
  • AM technology is defined as a process of joining materials to manufacture parts from 3D model data, and falls into the following categories: Binder Jetting (BJT) , Directed Energy Deposition (DED), Materials Extrusion (MEX), Material Jetting (MJT), Powder Bed Fusion n (PBF, powder bed fusion bonding), Sheet Lamination (SHL, sheet lamination ), Vat Photo Polymerization (VPP, liquid bath photopolymerization).
  • BJT Binder Jetting
  • DED Directed Energy Deposition
  • MEX Materials Extrusion
  • MX Material Jetting
  • PBF Powder Bed Fusion n
  • SHL Sheet Lamination
  • VPP Vat Photo Polymerization
  • target metals are attracting attention because they require fewer manufacturing steps than conventional metal processing methods, are expected to improve yields, and are expected to shorten manufacturing lead times and reduce manufacturing costs.
  • any of the above methods such as PBF (powder bed fusion bonding) will ultimately melt and solidify the metal, so the resulting metal The member has a solidified structure.
  • Such metal parts are further processed as necessary by HIP treatment, forging, heat treatment, cutting, etc. to reduce internal defects, improve material properties, and improve shape accuracy before being used as actual parts. be done.
  • titanium alloy which is a type of metal material, is lightweight and has high strength, and also has good affinity with living organisms, so it is used in the aircraft field and the medical field such as implants.
  • Ti-6Al-4V alloy which is an ⁇ + ⁇ type titanium alloy with high strength and excellent balance with ductility, is commonly used.
  • ⁇ + ⁇ type titanium alloys such as Ti-6Al-4V are produced by melting and solidifying raw materials mixed with titanium sponge and master alloy, and then producing ingots by forging and rolling.
  • Titanium alloy material is used as a titanium alloy material after being subjected to a drawing process to produce a drawn material such as a plate, wire rod, or profile.
  • the titanium alloy material is designed to have an equiaxed crystal structure for applications that require strength and ductility, and an acicular crystal structure for applications that require fracture toughness and creep resistance. , various processing and heat treatments are performed in the manufacturing process.
  • additive manufacturing technology is adopted as a means of manufacturing parts made of metal materials, and parts that are formed into a predetermined shape through melting and solidification and have a solidified structure. It has increased.
  • cast materials with a solidified structure obtained by melting and solidifying raw materials mixed with titanium sponge, master alloy, etc., or raw materials with a predetermined chemical composition have been used. It is being These titanium alloy materials manufactured through melting and solidification have not undergone rolling or heat treatment, and thus have a solidified structure with poor strength and toughness.
  • titanium alloys are described that can form objects. According to this, additively manufactured titanium alloys produce coarse columnar crystals resulting in undesirable anisotropic mechanical properties.
  • a beta eutectoid stabilizer an equiaxed crystal structure can be produced when the titanium alloy is melted or sintered during the additive manufacturing process.
  • the ⁇ eutectoid stabilizer may be selected from Fe, Ni, Cu, or combinations thereof.
  • Patent Document 2 Ti-Al-Fe based titanium alloys containing inexpensive Al and Fe are known instead of Ti-6Al-4V alloys. Furthermore, a Ti--Fe--Cu based titanium alloy is known that has improved high-temperature strength than industrially pure titanium by adding inexpensive Cu (Patent Document 3).
  • Patent Document 4 describes a titanium alloy that has higher strength, higher cold rollability, and workability than existing alloys that can be rolled into coils by adding amounts of Al, O, Cu, Sn, and Si. Controlled titanium alloys are described.
  • Patent Document 5 describes a titanium alloy in which the added amounts of Al, Cr, Fe, Cu, Ni, and C are controlled as a titanium alloy that exhibits strength, hot workability, and excellent machinability. There is.
  • Patent Document 6 discloses that by mixing Cu powder with titanium alloy powder and containing Cu up to a high concentration range of 1 to 10% using a raw powder mixing method, the tensile strength is 1000 to 1500 MPa, and the elongation is increased. A method for producing a titanium alloy that is 9-15% is described.
  • Patent Document 1 reduces the anisotropy of mechanical properties by reducing columnar crystals generated by melting or sintering to obtain an equiaxed crystal structure.
  • the titanium alloy described in Patent Document 2 is an alloy aimed at replacing the expensive V raw material of the Ti-Al-V alloy with cheap Fe, and although there is a description regarding tensile properties, there is no impact value.
  • Patent Document 3 relates to an inexpensive heat-resistant titanium alloy plate containing Cu, and although it describes tensile properties at room temperature and high temperature, it does not mention impact value.
  • Patent Document 4 relates to a titanium alloy with good cold rollability, and does not mention anything about a solidified structure with excellent strength and toughness.
  • Patent Document 5 relates to a titanium alloy with good cold rollability and a titanium alloy with excellent machinability, and is not a titanium alloy manufactured through melting and solidification.
  • Patent Document 6 describes a method for manufacturing a titanium alloy containing a high concentration of Cu by a raw powder mixing method, but does not mention the mechanical properties of a titanium alloy that has a solidified structure formed by melting and solidification. do not have.
  • a titanium alloy material having a solidified structure is required to have excellent strength and toughness, and to have an excellent balance between strength and toughness. Furthermore, titanium alloy materials manufactured through casting, hot working, heat treatment, etc. that have a processed structure different from the solidified structure have excellent strength and toughness, and also have an excellent balance between strength and toughness. That is what is required.
  • the present invention was made in view of the above-mentioned circumstances, and provides a titanium alloy material and a titanium alloy that have superior strength and toughness than conventional titanium alloys, and also have an excellent balance of both strength and toughness properties.
  • the object of the present invention is to provide a method for producing a wire rod, a titanium alloy powder, and a titanium alloy material.
  • the gist of the present invention for solving the above problems is as follows.
  • the titanium alloy material according to one aspect of the present invention has, in mass %, Al: 4.6% or more and 8.0% or less, Fe: 0.2% or more and 1.5% or less, Cu: 0.3 % or more and 2.0% or less, O: 0.03% or more and 0.20% or less, Sn: 0% or more and 3.0% or less, Nb: 0% or more and 8.0% or less, Si: 0% or more and 0.
  • the average length of the major axis approximated by an ellipse is 20 ⁇ m or more and 80 ⁇ m or less, the average aspect ratio of the ⁇ phase is 3.0 or more and 5.0 or less, and the impact absorption energy determined by the Charpy test at 25 ° C. is tested.
  • the impact value CIS which is the value divided by the cross-sectional area of the piece, is 40 J/cm 2 or more, the tensile strength TS is 900 MPa or more, and the impact value CIS and the tensile strength TS are 0.3 ⁇ TS+CIS ⁇ Satisfies 340.
  • the titanium alloy material described in [1] above contains Sn: 0.2% or more and 3.0% or less, Nb: 0.2% or more and 8.0% or less, and Si: 0.20% by mass. % or more and 0.80% or less, and Mo: 0.2% or more and 2.0% or less.
  • the titanium alloy powder according to yet another aspect of the present invention is a titanium alloy powder for producing the titanium alloy material described in [1] above, and has Al: 4.6% or more in mass %. 8.0% or less, Fe: 0.2% or more and 1.5% or less, Cu: 0.3% or more and 2.0% or less, O: 0.03% or more and 0.20% or less, Sn: 0% or more 3.0% or less, Nb: 0% or more and 8.0% or less, Si: 0% or more and 0.80% or less, and Mo: 0% or more and 2.0% or less, the remainder: Ti and impurities.
  • the average particle size is 10 ⁇ m or more and 100 ⁇ m or less, and the standard deviation of the particle size is 5 ⁇ m or more and 15 ⁇ m or less.
  • a method for manufacturing a titanium alloy material according to yet another aspect of the present invention is a method for manufacturing a titanium alloy material according to the above [1], wherein Al: 4 in mass % .6% or more and 8.0% or less, Fe: 0.2% or more and 1.5% or less, Cu: 0.3% or more and 2.0% or less, O: 0.03% or more and 0.20% or less, Sn : 0% or more and 3.0% or less, Nb: 0% or more and 8.0% or less, Si: 0% or more and 0.80% or less, and Mo: 0% or more and 2.0% or less, with the balance being
  • a first step in which Ti and titanium alloy powder as impurities are spread in layers to form a powder bed, and a part of the powder bed is melted and solidified by irradiating the surface of the powder bed with a high-energy beam, and the powder bed is
  • a method for producing a titanium alloy material according to yet another aspect of the present invention is a method for producing a titanium alloy material according to the above [1], wherein Al: 4% by mass .6% or more and 8.0% or less, Fe: 0.2% or more and 1.5% or less, Cu: 0.3% or more and 2.0% or less, O: 0.03% or more and 0.20% or less, Sn : 0% or more and 3.0% or less, Nb: 0% or more and 8.0% or less, Si: 0% or more and 0.80% or less, and Mo: 0% or more and 2.0% or less, with the balance being While supplying a titanium alloy material consisting of powder or wire, which is Ti and impurities, onto the base material, the titanium alloy material is irradiated with a high energy beam to melt and solidify the titanium alloy material on the base material.
  • the titanium alloy material obtained by the method for producing a titanium alloy material according to [5] or [6] above is heated.
  • One or more of machining, cold working, straightening, and cutting may be performed.
  • the present disclosure it is possible to obtain a titanium alloy material, a titanium alloy wire, and a titanium alloy powder that are superior in strength and toughness to conventional titanium alloys and have an excellent balance of both strength and toughness.
  • the present disclosure is not limited to a titanium alloy material having a solidified structure, but may also be a titanium alloy material having a processed structure. When the titanium alloy material has a processed structure, a titanium alloy material that can achieve a higher level of balance in both strength and toughness can be obtained.
  • the titanium alloy material of the present disclosure can be used in members for a wide variety of uses that are manufactured by additive manufacturing. Further, the titanium alloy material of the present disclosure is a titanium alloy material with an excellent balance of strength and toughness, and can contribute to energy and resource conservation by taking advantage of its lightweight and high strength characteristics.
  • the titanium alloy material is not limited to a titanium alloy material that partially or entirely has a solidified structure, but also includes a titanium alloy material that has a processed structure.
  • the present inventor has developed a chemical composition that has better strength and toughness than existing titanium alloys in various metal structure states such as solidified structure and processed structure, especially in the state of solidified structure, and also has an excellent balance between strength and toughness. After much research, we found a component system that would provide good properties.
  • solidified structure is used to refer to a metal structure obtained through a process of melting and solidification.
  • the term "worked structure” refers to metal structures other than solidified structures such as cast materials, specifically, processed structures obtained by further hot working or heat treatment, etc. It is used to refer to the metal structure such as the following structure.
  • the solidified structure can be exemplified by, for example, a structure composed of columnar crystal grains and equiaxed crystal grains.
  • an example of the processed structure is a structure composed of elongated crystal grains and equiaxed crystal grains formed by recrystallization. These are classified based on the difference in the shape of the crystal, as opposed to the classification based on the manufacturing process.
  • Columnar crystal grains are generally formed in a columnar shape from the surface of the titanium alloy material toward the center. Equiaxed grains may be formed in the center.
  • Stretched crystal grains are formed by elongating or contracting a solidified structure or equiaxed crystal grains in a specific direction by deformation, or by a combination thereof.
  • Equiaxed crystal grains are formed by recrystallization by applying heat treatment to stretched crystal grains after processing.
  • processed structures include acicular structures (mainly ⁇ phase and ⁇ phase), equiaxed structures (mainly ⁇ phase), and various shapes (mainly ⁇ phase) formed by heat treatment as described below, specifically heat treatment accompanied by transformation. Contains precipitates of equiaxed grains).
  • the aspect ratio of equiaxed crystal grains is approximately 1, whereas the aspect ratio of elongated crystal grains is a value other than 1.
  • the equiaxed crystal grains after heat treatment have a spherical shape
  • the equiaxed crystal grains have a perfect circular shape
  • the stretched crystal grains after processing have an elliptical shape.
  • the processed structure is not limited to those described above.
  • the impact value (CIS) obtained by dividing the impact absorption energy determined by the Charpy test at 25° C. by the cross-sectional area of the test piece was used.
  • conventional titanium alloys such as Ti-6Al-4V have a relationship between impact value (CIS, unit: J/cm 2 ) and tensile strength (TS, unit: MPa) of 0. It was found that 3 ⁇ TS+CIS ⁇ 340. That is, it was found that the total value of 0.3 times the tensile strength (MPa) and the impact value (J/cm 2 ) was less than 340 at most.
  • the titanium alloy material of this embodiment has, in mass %, Al: 4.6% or more and 8.0% or less, Fe: 0.2% or more and 1.5% or less, and Cu: 0.3% or more and 2.0%. Below, O: 0.03% or more and 0.20% or less, Sn: 0% or more and 3.0% or less, Nb: 0% or more and 8.0% or less, Si: 0% or more and 0.8% or less, and It has a chemical composition containing Mo: 0% or more and 2.0% or less, and the remainder: Ti and impurities. Further, the titanium alloy material of this embodiment is an ⁇ + ⁇ type titanium alloy material.
  • % for the content of each element in the chemical composition means “% by mass”.
  • the numerical range means a range that includes the numerical values written before and after " ⁇ ” as the lower limit and upper limit.
  • a numerical range in which "more than” or “less than” is attached to the numerical value written before and after " ⁇ ” means a range that does not include these numerical values as the lower limit or upper limit.
  • Al is an ⁇ -phase stabilizing element, and is an element that mainly strengthens the ⁇ -phase.
  • the Al content is less than 4.6%, it becomes difficult to secure a tensile strength of 900 MPa or more, which is equivalent to or higher than ⁇ + ⁇ type titanium alloy Ti-3Al-2.5V (ASTM grade 9).
  • the Al content exceeds 8.0%, the ductility decreases significantly and the toughness decreases.
  • the Al content is set to 4.6% or more and 8.0% or less.
  • the Al content is preferably 4.8% or more, more preferably 5.0% or more.
  • the Al content may be preferably 7.8% or less, more preferably 7.5% or less.
  • Fe is a ⁇ phase stabilizing element, and the amount of solid solution in the ⁇ phase is small compared to other elements, and when the amount of solid solution in the ⁇ phase is exceeded, it is It becomes two-phase and improves strength.
  • the titanium alloy material of the present disclosure since Cu, which is the same ⁇ stabilizing element, is added at the same time, the effect can be obtained if Fe is 0.2% or more.
  • the Fe content is set to 0.2% or more and 1.5% or less.
  • the Fe content may be preferably 0.3% or more, more preferably 0.5% or more. Further, the Fe content may be preferably 1.3% or less, more preferably 1.0% or less.
  • Cu is a ⁇ -stabilizing element, and like Fe, it transforms into two phases, an ⁇ phase and a ⁇ phase, to improve strength.
  • Cu can form a solid solution in the ⁇ phase up to a maximum of about 2.5%, improving the strength of the titanium alloy material.
  • it does not suppress twinning deformation, which is a type of deformation mechanism of the ⁇ phase, so it hardly impairs the ductility and toughness of the ⁇ phase, which is essential for improving the balance between strength and toughness.
  • It is an additive element.
  • Cu exceeds 2.0%, a compound of Ti and Cu will precipitate coarsely, resulting in a decrease in toughness.
  • Cu is less than 0.3%, the effect of improving the strength and ductility balance becomes poor.
  • the maximum solid solution amount of Cu in the ⁇ phase increases as the Al content increases, is hardly affected by the Fe content, and decreases as the O content increases. Therefore, in the titanium alloy material according to the present disclosure containing 4.6% or more of Al, the effects of Cu can be more greatly enjoyed. As mentioned above, when Al exceeds 8.0%, the strength increases, but the toughness decreases.
  • the Cu content is set to 0.3% or more and 2.0% or less.
  • the Cu content may be 0.5% or more. Further, the Cu content may be 1.5% or less.
  • O is an ⁇ -phase stabilizing element and is an element that strengthens the ⁇ -phase.
  • the O content is preferably 0.20% or less.
  • the O content is preferably 0.18% or less, more preferably 0.16% or less, even more preferably 0.15% or less.
  • O is an element that is difficult to remove in titanium smelting, and reducing it to less than 0.03% causes an excessive increase in cost. Therefore, the O content is preferably 0.03% or more.
  • the O content is more preferably 0.04% or more, even more preferably 0.05% or more.
  • Sn is an element that forms a solid solution in the ⁇ phase and ⁇ phase and strengthens both phases. When dissolved in the ⁇ phase, it can be strengthened without impairing ductility and toughness, similar to Cu, but its effect is smaller than that of Cu. If the Sn content exceeds 3.0%, toughness will decrease. Therefore, when Sn is contained, the Sn content is 3.0% or less.
  • the Sn content is preferably 2.0% or less. Moreover, when Sn is contained, the Sn content may be 0.2% or more, 0.5% or more, or 1.0% or more.
  • Nb is a ⁇ -stabilizing element, but a part of it is dissolved in the ⁇ phase to strengthen it. However, its strengthening ability per mass % is small compared to Fe, Cu, and Sn. When the Nb content exceeds 8.0%, the effect is saturated. Therefore, when Nb is contained, the Nb content should be 8.0% or less. The Nb content is preferably 5.0% or less. Further, when Nb is contained, the Nb content may be 0.2% or more, 0.5% or more, or 1.0% or more.
  • Si is a ⁇ -stabilizing element, it also forms a solid solution in the ⁇ phase and has a great effect of improving the strength of the alloy.
  • Si exceeds 0.80%, a compound of Ti and Si will precipitate coarsely, resulting in a decrease in toughness. Therefore, when containing Si, the Si content should be 0.80% or less.
  • the Si content is preferably 0.50% or less.
  • the Si content may be 0.20% or more, or may be 0.30% or more.
  • Mo is a ⁇ -stabilizing element and has a stronger strengthening ability per mass % than Cu, but if it exceeds 2.0%, the ⁇ phase precipitated in the ⁇ phase becomes too fine and the toughness significantly decreases. Therefore, when Mo is contained, the Mo content is set to 2.0% or less. Mo content is preferably 1.8% or less. Moreover, when Mo is contained, the Mo content may be 0.2% or more, 0.5% or more, or 1.0% or more.
  • the remainder in the chemical composition may be Ti and impurities.
  • Impurities refer to C, N, H and other impurities. These are impurities that do not need to be included in the titanium alloy material, but are inevitably mixed in, so their inclusion in the titanium alloy material is unavoidable. If the C content is 0.20% or less, the N content is 0.20% or less, and the H content is 0.0150% or less, there is no problem. Specific examples of other impurities include Cl, Na, Mg, and Ca that are mixed in during the refining process, and Zr, Ta, V, Pt, Pd, Mn, Co, Y, B, and Ru that are mixed in from scrap. , W, Cr, Ni, etc.
  • the content of elements other than C, N, and H as impurities is, for example, 0.1% or less each, and a total amount of 0.5% or less is at a level that does not cause any problem.
  • Cr or Ni which is a typical eutectoid ⁇ -stabilizing element, can be used as a partial or complete substitute for Fe, as it stabilizes the ⁇ phase and contributes to improving strength by forming two phases in the same way as Fe. It may happen.
  • Cr and Ni is contained in the Ti-Al-Fe-Cu-O system, which is the basic component system of the present disclosure, the amount of solid solution of Cu in the ⁇ phase will be reduced, and the strength due to Cu will decrease. and the effect of improving ductility balance cannot be obtained. Therefore, it is preferable to limit Cr or Ni to a level that is contained as an impurity in the titanium raw material, such as sponge titanium or titanium scrap. The level is preferably such that each concentration of Cr or Ni is 0.1% or less.
  • FIG. 1 shows an example of an Image Quality map of a titanium alloy material according to an embodiment of the present invention obtained by EBSD.
  • FIG. 2 shows an example of an image quality map of a conventional titanium alloy material obtained by EBSD.
  • the conventional titanium alloy material after hot working and heat treatment is composed of crystal grains of about several tens of micrometers, as shown in FIG. 2, and the solidification structure of the titanium alloy material according to the present embodiment shown in FIG. 1 is clearly different. different.
  • the titanium alloy material according to this embodiment has a solidified structure in a part thereof.
  • the solidified structure of the titanium alloy material according to this embodiment will be explained in detail. Note that the entire metal structure of the titanium alloy material according to this embodiment may be a solidified structure.
  • the titanium alloy material according to the present embodiment has a chemical composition of a titanium alloy generally called an ⁇ + ⁇ type titanium alloy, and its metal structure contains 70% or more of ⁇ phase and 30% or less of ⁇ phase at room temperature. . Further, depending on the elements contained and the manufacturing history, compounds of Ti and Cu, compounds of Ti and Fe, and compounds of Ti and Si may be present in a total amount of 3% or less.
  • a titanium alloy having a chemical composition according to the present embodiment When a titanium alloy having a chemical composition according to the present embodiment is solidified from a molten state, columnar crystals are formed continuously in the solidification direction, but a ⁇ phase (bcc structure) is first formed as a metal phase. As the temperature decreases, an ⁇ phase (hcp structure) is formed at the grain boundaries and within the grains of the ⁇ phase.
  • the crystal grain size of the ⁇ phase formed during solidification varies depending on the size of the titanium alloy material being manufactured, the holding time at high temperature, the cooling method, etc., but titanium alloys with a side of several tens of mm or less
  • the crystal grain size of the ⁇ phase when observed in a cross section perpendicular to the solidification direction is often about 2 mm or less.
  • the grain size of the ⁇ phase is often about 50 mm or less when observed in a cross section perpendicular to the solidification direction. .
  • the ⁇ phase formed at the grain boundaries of the ⁇ phase is generally called a grain boundary ⁇ .
  • grain boundaries ⁇ are not formed, and acicular ⁇ phases or ⁇ ' phases are formed within the grains of the ⁇ phase.
  • the acicular ⁇ phase formed within the ⁇ phase is generally called acicular ⁇ .
  • the acicular ⁇ often forms a colony structure in which grains having approximately the same crystal orientation are formed in layers. The size of the colony structure generally has a positive correlation with the grain size of the ⁇ phase.
  • the average length of the major axis of the ⁇ phase approximated to an ellipse is preferably 25 ⁇ m or more, more preferably 30 ⁇ m or more. Further, if the average long axis length of the ⁇ phase approximated to an ellipse is 80 ⁇ m or less, a high impact value can be obtained without excessively decreasing ductility.
  • the average length of the long axis of the elliptical approximation of the ⁇ phase is preferably 70 ⁇ m or less, more preferably 60 ⁇ m or less.
  • the average aspect ratio of the ⁇ phase is 3.0 or more and 5.0 or less.
  • the average aspect ratio of the ⁇ phase referred to here is the average of the aspect ratios of the grain boundaries ⁇ and the acicular ⁇ . If the average aspect ratio of the ⁇ phase is 3.0 or more, the impact value will improve due to the effect of crack deflection.
  • the average aspect ratio of the ⁇ phase is preferably 3.2 or more, more preferably 3.4 or more. Further, if the average aspect ratio of the ⁇ phase is 5.0 or less, a high impact value can be obtained without excessively decreasing ductility.
  • the average aspect ratio of the ⁇ phase is preferably 4.8 or less, more preferably 4.6 or less.
  • the average long axis length and average aspect ratio of the elliptical approximation of the ⁇ phase are measured by the following method.
  • An arbitrary rectangular parallelepiped test piece with a height of 3 to 20 mm, a width of 3 to 20 mm, and a length of 1/4 to 3/4 is taken from a titanium alloy material.
  • the height direction and width direction of the rectangular parallelepiped test piece are made to correspond to the height direction and width direction of the titanium alloy material, respectively, and the center of the surface consisting of the height direction and width direction of the rectangular parallelepiped test piece is set to the titanium alloy material.
  • the rectangular parallelepiped test is taken at a position corresponding to 1/2 the height and 1/2 the width.
  • the surface consisting of the height direction and width direction of the rectangular parallelepiped specimen is used as the observation surface, and the observation surface is roughly polished using emery paper.
  • the width direction is a direction perpendicular to the beam irradiation direction when manufacturing the titanium alloy material. If it is difficult to specify the width direction, the width direction is defined as the shorter length in a plane perpendicular to the stacking direction.
  • the height corresponds to the stacking direction.
  • SEM scanning electron microscope
  • EBSD electron backscatter diffraction
  • the measurement and analysis conditions were an accelerating voltage of 15 kV, a measurement magnification of 250 times, a measurement field of view of 300 ⁇ m square or more, a measurement step of 0.5 ⁇ m, a grain tolerance of 5°, and the shape of the crystal grains determined to be ⁇ phase from Kikuchi pattern analysis. Find the major axis length and aspect ratio obtained by ellipse approximation.
  • the ⁇ phase remains even at room temperature, and some of it may form an ⁇ '' phase or ⁇ phase, or a compound of Ti and Cu, a compound of Ti and Fe, or a compound of Ti and Si.
  • the titanium alloy material of this embodiment may have a solidified structure consisting of columnar and equiaxed crystal grains.
  • the metal structure of the titanium alloy material of this embodiment is not limited to having the above-mentioned solidified structure, but may have a processed structure.
  • Processed structures include, for example, elongated crystal grains obtained by applying processes that involve deformation such as hot rolling to a member having a solidified structure, such as a cast material, and equiaxed crystals obtained by further heat treatment. Examples include structures containing precipitates of various shapes, including grains, acicular crystal grains obtained by heat treatment accompanied by transformation as described above, and equiaxed grains.
  • the titanium alloy material of this embodiment has excellent toughness and strength regardless of whether the metal structure is a solidified structure, a processed structure, or another structure. That is, the titanium alloy material of this embodiment has an impact value (CIS, unit: J/cm 2 ) obtained by dividing the impact absorption energy determined by the Charpy test at 25° C. by the cross-sectional area of the test piece, and a tensile strength ( The relationship with TS (unit: MPa) is 0.3 ⁇ TS+CIS ⁇ 340, the toughness is CIS ⁇ 40, and the strength is TS ⁇ 900. Such toughness and strength can be achieved even if the titanium alloy material of this embodiment has a solidified structure.
  • CIS impact value
  • J/cm 2 a tensile strength
  • CIS is preferably 45 or more.
  • TS is preferably 950 MPa or more.
  • the titanium alloy material according to this embodiment is manufactured by the additive manufacturing technique described above, and the powder bed fusion method or the directed energy deposition method is applied to the method for manufacturing the titanium alloy material according to this embodiment.
  • a method for producing a titanium alloy material using a powder bed fusion bonding method and a directed energy deposition method will be described.
  • powder bed fusion bonding method In the case of the powder bed fusion bonding method, metal raw materials such as sponge titanium, aluminum, iron, and copper are mixed and compression molded as necessary, followed by consumable electrode vacuum arc melting (VAR), electron beam melting ( EBR), plasma arc melting (PAM), or the like, the titanium alloy powder is melted, forged or rolled as necessary to form a bar, and then, for example, by gas atomization or the like, titanium alloy powder is manufactured.
  • VAR vacuum arc melting
  • EBR electron beam melting
  • PAM plasma arc melting
  • the obtained titanium alloy powder is spread in a layer to form a powder bed, and a first step is performed in which a part of the powder bed is melted and solidified by irradiating the surface of the powder bed with a high-energy beam.
  • the thickness of the powder bed is, for example, from 20 to 150 ⁇ m.
  • titanium alloy powder is spread in a layer on top of the powder bed to form a new powder bed, and a part of the new powder bed is melted and solidified by irradiating the surface of this new powder bed with a high-energy beam.
  • the thickness of the powder bed in the second step is also, for example, 20 to 150 ⁇ m, similar to the powder bed in the first step.
  • the heat input amount of the laser beam in each of the first step and the second step is, for example, 5.0 to 30.0 J/mm 3 .
  • the scanning speed of the laser beam is, for example, 400 to 900 mm/sec, and the laser output is 70 to 200 W.
  • the laser beam diameter is, for example, 30 to 70 ⁇ m.
  • the laser beam irradiation interval is, for example, 50 to 150 ⁇ m.
  • the penetration depth is, for example, 10 to 150 ⁇ m.
  • the laser beam irradiation atmosphere in the first step and the second step is an inert gas atmosphere, for example, an argon atmosphere in order to prevent oxidation.
  • the powder used in the powder bed fusion bonding method can be titanium alloy powder, which will be described later, but is not limited to the titanium alloy powder, but may also include titanium powder, aluminum powder, iron powder, copper powder, and other powders.
  • a mixed powder prepared by adjusting a metal powder and an alloy powder containing a portion of each powder to have the chemical composition of a titanium alloy material may be used.
  • directed energy deposition method metal raw materials such as titanium sponge, aluminum, iron, and copper are mixed and compression molded as necessary, followed by consumable electrode vacuum arc melting (VAR), electron beam melting, etc. (EBR), plasma arc melting (PAM), etc., and if necessary, forge or roll the bar material, and then, for example, use gas atomization or other means to produce titanium alloy powder.
  • VAR vacuum arc melting
  • EBR electron beam melting, etc.
  • PAM plasma arc melting
  • titanium alloy powder after melting, it is solidified to form a slab, and this slab is forged, rolled, and wire-drawn to produce a titanium alloy wire rod.
  • These titanium alloy powders or titanium alloy wires are used as titanium alloy materials.
  • the titanium alloy material is irradiated with a high energy beam to melt and solidify the titanium alloy material on the base material.
  • a titanium alloy material having a predetermined shape can be manufactured.
  • High energy beams include, for example, electron beams, plasma arcs, or laser beams. Examples of cases in which an electron beam is irradiated and a plasma arc is used will be described below.
  • the titanium alloy material for example, a wire rod having a diameter of 1.0 to 8.0 mm or a square bar having a cross-sectional area equal to the cross-sectional area of the wire rod is used.
  • the current of the electron beam is, for example, 10 to 100 mA
  • the feeding speed of the titanium alloy material is, for example, 1000 to 3000 mm/min.
  • the thickness of the titanium alloy base material is, for example, 10 to 20 mm, and the titanium alloy base material is cooled.
  • the cooling rate when the temperature of the titanium alloy base material is in the range of 1000 to 700°C is, for example, 3.0°C/second or more.
  • the titanium alloy material for example, a wire rod having a diameter of 1.0 to 8.0 mm or a square bar having a cross-sectional area equal to the cross-sectional area of the wire rod is used.
  • the plasma current is, for example, 100 to 300 A
  • the feeding speed of the titanium alloy material is, for example, 10 to 400 mm/min.
  • the thickness of the titanium alloy base material is, for example, 10 to 20 mm, and the titanium alloy base material is cooled.
  • the cooling rate when the temperature of the titanium alloy base material is in the range of 1000 to 700°C is, for example, 3.0°C/second or more.
  • the cooling rate in the range of less than 700°C is, for example, 0.2°C/second or more and 3.0°C/second or less.
  • the plasma arc atmosphere is an inert gas atmosphere, such as an argon atmosphere, to prevent oxidation. Note that the cooling of the titanium alloy base material may be outside the above-mentioned range as long as deformation due to thermal effects is suppressed and a cooling rate of the laminate can be obtained.
  • the energy density, feed rate of the titanium alloy base material, cooling rate, and irradiation atmosphere may be determined depending on the characteristics required of the titanium alloy material to be manufactured.
  • a powdered titanium alloy material may be used, and the feeding speed of the powdered titanium alloy material is, for example, about 6 cm 3 /min in the case of electron beam irradiation, and in the case of plasma irradiation. In this case, it is about 1 cm 3 /min.
  • Titanium alloy materials manufactured by using the above-mentioned directed energy deposition method or powder bed fusion bonding method all have a solidified structure.
  • Titanium alloy materials manufactured by additive manufacturing technology may be further subjected to general processing such as HIP treatment, forging, extrusion, and rolling for the purpose of reducing internal defects and controlling shape.
  • the heating temperature during processing such as forging and rolling may be above the ⁇ transformation temperature or below the ⁇ transformation temperature. After the above processing, heat treatment is performed.
  • the surface of the titanium material is cooled at a cooling rate of 3.0°C/sec or more.
  • the holding time is preferably 30 minutes or less in order to prevent the crystal grains from becoming too coarse and reducing the strength.
  • the cooling rate is preferably 5.0° C./second or more.
  • the above processing before heat treatment may be omitted. Further, surface finishing such as cutting, cutting, or polishing may be performed. When surface finishing such as cutting, cutting, or polishing is performed, it is performed after processing and heat treatment.
  • the titanium alloy material according to the present embodiment has, in addition to the solidified structure containing columnar and equiaxed crystal grains, for example, a shape including elongated grain-like crystals, equiaxed grains, elongated grains, and rectangular shapes. It may be a tissue containing the above-mentioned compound consisting of. Furthermore, titanium alloy materials with the above-mentioned solidification structure can be further processed and heat treated for general titanium alloys such as forging, rolling, extrusion, bending, cutting, and heat treatment to produce plates, rods, tubes, etc. It can also be used as a wrought material.
  • the maximum diameter of the titanium alloy wire is 1.0 mm or more and 8.0 mm or less.
  • the maximum diameter of the titanium alloy wire is 1.0 mm or more.
  • the maximum diameter of the titanium alloy wire is preferably 1.2 mm or more, more preferably 1.4 mm or more.
  • the maximum diameter of the titanium alloy wire is 8.0 mm or less.
  • the maximum diameter of the titanium alloy wire When the maximum diameter of the titanium alloy wire is 4.8 mm or less, it can be melted more uniformly when irradiated with energy in the directional energy deposition method. Therefore, the maximum diameter of the titanium alloy wire is preferably 3.2 mm or less. The maximum diameter of the titanium alloy wire is more preferably 2.0 mm or less.
  • the maximum diameter of the titanium alloy wire is measured by the following method. That is, the diametrical dimension of the wire rod is measured at two or more locations per cross section and at least two cross sections for each lot using a micrometer or a caliper, and the maximum value is taken as the maximum diameter.
  • the tensile strength of the titanium alloy wire according to this embodiment is 900 MPa or more. This is because when the tensile strength of the titanium alloy wire according to the present embodiment is 900 MPa or more, a tensile strength higher than that of the titanium alloy Ti-3Al-2.5V manufactured by the conventional method can be obtained.
  • the tensile strength of the titanium alloy wire is preferably 920 MPa or more, more preferably 930 MPa or more.
  • the upper limit of the tensile strength of the titanium alloy wire is not particularly limited, and the tensile strength of the titanium alloy wire can be, for example, 1300 MPa or less, and may be 1400 MPa or less.
  • the tensile strength of titanium alloy wire is measured by the following method. For titanium alloy wire rods with a maximum diameter of 6.0 mm or more and 8.0 mm or less, a round bar test piece with a parallel part ⁇ 3 mm, a length of 20 mm, and a gauge distance of 10 mm made from the titanium alloy wire rod at room temperature (25 ° C.) It is carried out at a tensile speed of 10 mm/min. For titanium alloy wires with a maximum diameter of less than 6.0 mm, a round bar test piece with a distance between scores of 100 mm is cut from the titanium alloy wire, and the test is performed at room temperature (25° C.) at a tensile rate of 30 mm/min.
  • the Vickers hardness of the titanium alloy wire is preferably 320 Hv or more and 380 Hv or less.
  • the Vickers hardness is 380 Hv or less, cracking during wire drawing is suppressed.
  • the Vickers hardness is 320 Hv or more, high strength can be obtained when a titanium alloy material is manufactured using the wire.
  • the Vickers hardness of a titanium alloy wire is measured in accordance with JIS Z 2244:2020 at the center of a cross section perpendicular to the long axis of each material under a load of 1 Kgf (9.8 N).
  • the standard test piece has a length of 55 mm and a square cross section of 10 mm in length. At the center of the length, make a V-notch with a notch angle of 45 degrees, notch depth of 2 mm, and notch bottom radius of 0.25 mm. If a standard test piece cannot be taken, a sub-size test piece with a thickness of 7.5 mm, 5 mm or 2.5 mm may be used.
  • a method for manufacturing a titanium alloy wire After mixing metal raw materials such as sponge titanium, aluminum, iron, and copper and compression molding as necessary, the process can be performed using consumable electrode vacuum arc melting (VAR), electron beam melting (EBR), or plasma arc melting (PAM). ) etc. to produce ingots.
  • VAR vacuum arc melting
  • EBR electron beam melting
  • PAM plasma arc melting
  • a titanium alloy ingot is forged to produce a billet with a diameter of 100 mm, and the billet is heated to 950° C. and then rolled. After rolling, the titanium alloy is repeatedly annealed at 700 to 800°C for 5 to 60 minutes and wire drawn using a cassette roller die or die drawing to obtain a desired diameter. Thereafter, the titanium alloy after wire drawing is air-cooled annealed at a temperature of 700 to 750°C for 1 hour.
  • the titanium alloy powder used for manufacturing the titanium alloy material has a chemical composition similar to that of the titanium alloy material described above, has an average particle size of 10 ⁇ m or more and 100 ⁇ m or less, and has a standard deviation of particle size of 5 ⁇ m or more and 15 ⁇ m. It is as follows.
  • the average particle size of the titanium alloy powder is 10 ⁇ m or more and 100 ⁇ m or less. If the average particle size of the titanium alloy powder is less than 10 ⁇ m, fluidity will deteriorate.
  • the average particle size of the titanium alloy powder is preferably 15 ⁇ m or more, more preferably 20 ⁇ m or more. On the other hand, if the average particle size of the titanium alloy powder is more than 100 ⁇ m, defects due to unmelting are likely to occur.
  • the average particle size of the titanium alloy powder is preferably 90 ⁇ m or less, more preferably 80 ⁇ m or less.
  • the standard deviation of the particle size of the titanium alloy powder is 5 ⁇ m or more and 15 ⁇ m or less. If the standard deviation of the particle size of the titanium alloy powder is less than 5 ⁇ m, the yield will drop significantly due to sieving.
  • the standard deviation of the particle size of the titanium alloy powder is preferably 6 ⁇ m or more, more preferably 7 ⁇ m or more. On the other hand, if the standard deviation of the particle size of the titanium alloy powder is more than 15 ⁇ m, fluidity will decrease and defects will likely occur.
  • the standard deviation of the particle size of the titanium alloy powder is preferably 14 ⁇ m or less, more preferably 13 ⁇ m or less.
  • the average particle size and standard deviation of the particle size of the titanium alloy powder are measured by a method based on JIS Z 8825:2013 Particle size analysis - laser diffraction/scattering method.
  • titanium alloy powder is produced by mixing metal raw materials such as titanium sponge, aluminum, iron, and copper, compression molding as necessary, and then using consumable electrode vacuum arc melting (VAR) or electron beam melting ( EBR), plasma arc melting (PAM), etc. to produce a bar material, forging and rolling, and then, for example, gas atomization.
  • VAR vacuum arc melting
  • EBR electron beam melting
  • PAM plasma arc melting
  • titanium alloy materials were manufactured using a wire and arc-based additive manufacturing (WAAM) method or a powder bed fusion bonding method using a titanium alloy wire as a raw material.
  • WAAM wire and arc-based additive manufacturing
  • a powder bed fusion bonding method using a titanium alloy wire as a raw material.
  • a titanium alloy wire ( ⁇ 1.6 mm) having the chemical composition shown in Table 1 was prepared as a titanium alloy material.
  • a plasma welding torch was used for additive manufacturing, and the current value was 200A.
  • the base material was a titanium alloy plate with a thickness of 12.7 mm.
  • a modeling area set in advance on the base material was surrounded by a chamber and shielded with Ar gas at a flow rate of 15 L/min.
  • a titanium alloy material consisting of an additively manufactured sample with a width of 18 mm, a length of 100 mm, and a thickness of 15 mm was produced on a base material by performing a lamination process in which such operations were repeated multiple times.
  • Examples 23 to 26 are examples in which titanium alloy materials were manufactured by electron beam irradiation.
  • a wire rod with a diameter of 1.6 mm was used as the titanium alloy material.
  • the current of the electron beam was 50 mA, and the feeding speed of the titanium alloy material was 300 mm/min.
  • the thickness of the titanium alloy base material is 12.7 mm, the cooling rate is 5 °C/sec when the temperature of the titanium alloy base material is in the range of 1000 to 700 °C, and the cooling rate is 2 °C when the temperature is less than 700 °C. /second.
  • the pressure of the electron beam irradiation atmosphere was set to (1 ⁇ 10 ⁇ 2 ) Pa.
  • Examples 34 to 36 are examples using the powder bed fusion bonding method. Titanium alloy powder having the chemical composition shown in Table 1, an average particle size of 30 ⁇ m, and a standard deviation of 8 ⁇ m was spread to a thickness of 30 ⁇ m to form a powder bed. The surface of the powder bed was irradiated with a laser beam under an argon atmosphere. The heat input amount of the laser beam was 19.5 J/mm 3 , the scanning speed of the laser beam was 650 mm/sec, and the laser output was 95 W. The laser beam diameter was 50 ⁇ m. The laser beam irradiation interval was 100 ⁇ m. The penetration depth was 75 ⁇ m.
  • the above titanium alloy powder was spread in a layer on the powder bed after laser beam irradiation to form a new powder bed, and the surface of this new powder bed was irradiated with a laser beam under the same atmosphere and conditions as above.
  • a titanium alloy material consisting of an additively manufactured sample with a width of 18 mm, a length of 100 mm, and a thickness of 15 mm was produced.
  • titanium alloy materials consisting of additively manufactured samples with a width of 18 mm, a length of 100 mm, and a height of 30 mm were fabricated on a base material in the same manner as described above. After heating the titanium alloy material to 950° C., it was rolled down to a height of 15 mm at a strain rate of 0.5/sec. Thereafter, it was heated to 1100°C, held for 10 minutes, and then cooled with water. The cooling rate in the range of 1000 to 700°C during water cooling was about 5°C/sec.
  • a titanium alloy material consisting of an additively manufactured sample with a width of 18 mm, a length of 100 mm, and a height of 30 mm was produced on a base material in the same manner as above. After heating the titanium alloy material to 950° C., it was rolled down to a height of 15 mm at a strain rate of 0.5/sec. Thereafter, it was heated to 1100°C, held for 10 minutes, and then cooled in a furnace. The cooling rate in the range of 1000 to 700°C during furnace cooling was about 0.1°C/sec.
  • the average long axis length and average aspect ratio of the elliptical approximation of the ⁇ phase were measured using the following method.
  • a rectangular parallelepiped test piece measuring 10 mm in height x 10 mm in width x 5 mm in thickness was taken.
  • the height direction and width direction of the rectangular parallelepiped test piece were made to match the height direction and width direction of the titanium alloy material, respectively, and the thickness direction of the rectangular parallelepiped test piece was made to match the longitudinal direction of the titanium alloy material.
  • the height 1/2 and width 1/2 position of the rectangular parallelepiped specimen is matched with the height 1/2 and width 1/2 position of the titanium alloy material, and the surface (height
  • the above-mentioned rectangular parallelepiped test was taken with a thickness equal to the polishing allowance (approximately 1 mm) so that the surface (consisting of the direction and the width direction) coincided with the position of 1/2 of the longitudinal direction of the titanium alloy material.
  • the 10 mm height x 10 mm width surface of the rectangular parallelepiped test piece was used as the observation surface, and the observation surface was roughly polished using emery paper so that the observation surface was 1/2 in the longitudinal direction of the titanium alloy material.
  • observation surface was roughly polished, it was buffed using colloidal silica to give the observation surface a mirror finish.
  • SEM scanning electron microscope
  • EBSD electron backscatter diffraction
  • OIM analysis V7 was used.
  • the measurement conditions and analysis conditions were an accelerating voltage of 15 kV, a measurement magnification of 250 times, a measurement field of view of 468 ⁇ m in the X direction, 366 ⁇ m in the Y direction, and a measurement step of 0.5 ⁇ m.
  • test pieces used for the Charpy impact test were as follows.
  • the test piece dimensions were 10 mm x 10 mm x 55 mm, and the test piece had a 2 mm V-notch. Align the longitudinal direction of the test piece with the length direction of the titanium alloy material so that the longitudinal direction of the test piece is parallel to the base material and the notch is perpendicular to the base material.
  • Test pieces were taken from a range of 5 to 25 mm in the height direction of the laminated material, with the position corresponding to the 1/2 position in the width direction of the titanium alloy material.
  • the Charpy impact test was conducted at room temperature (25°C) in accordance with JIS Z 2242:2018.
  • the impact test results were evaluated by the impact value (J/cm 2 ) obtained by dividing the absorbed energy by the cross-sectional area of the test piece.
  • a round bar test piece with a parallel part of 6.25 mm x 32 mm and a gauge distance of 25 mm was taken.
  • the longitudinal direction of the test piece is aligned with the length direction of the titanium alloy material so that the longitudinal direction of the test piece is parallel to the base material, and the center position (1/2 position) in the width direction of the test piece is aligned with the titanium alloy material.
  • the round bar test piece was taken from a range of 5 to 25 mm in the height direction of the laminated material, matching the 1/2 position in the width direction of the material.
  • the tensile test was conducted at room temperature (25° C.) at a tensile rate of 1 mm/min up to 0.2% proof stress measurement and 10 mm/min thereafter.
  • Table 1 shows the chemical composition of the titanium alloy material, and Table 2 shows the results. Note that "-" in Table 1 indicates that the alloying element was not actively included.
  • the tensile strength TS was set at a standard value of 900 MPa, which is a tensile strength exceeding that of the existing alloy Ti-3Al-2.5V (JIS 61 type), and a value of 900 MPa or higher was considered a pass. Moreover, an impact value CIS of 40 J/cm 2 or more was considered to be acceptable. Furthermore, as an index of the balance between the properties of tensile strength and impact value, whether or not the following formula (1) was satisfied was used as a standard, and the case where the following formula (1) was satisfied was determined to be a pass.
  • Examples 1 and 2 are titanium alloy materials with a conventional chemical composition of Ti-Al-V system.
  • Example 1 does not contain Fe and Cu, has a small impact value CIS, and does not satisfy formula (1) indicating the relationship between strength (TS) and impact value (CIS), and therefore does not have desirable characteristics.
  • Ta has a small Al content, does not contain Fe and Cu, has a low average long axis length and low tensile strength, and shows the relationship between strength (TS) and impact value (CIS).
  • Formula (1) was also not satisfied and the passing range was not reached.
  • Example 3 is a Ti-Al-Fe based alloy, but it does not contain Cu and has an excessive O content, so the impact value is small, and the strength (TS) and impact value (CIS) are low. It did not satisfy Equation (1) showing the relationship, and was rejected.
  • Example 4 did not contain Cu and did not satisfy formula (1) indicating the relationship between strength and impact value, and was rejected.
  • Example No. 5 had a low tensile strength TS due to low Al content and was rejected.
  • Examples 6 to 17 have a chemical composition of Al: 4.6 to 8.0%, Fe: 0.2 to 1.5%, Cu: 0.3 to 2.0%, O: 0.03 to It contained 0.20% and satisfied all of the strength, impact value, and formula (1) showing the relationship between strength and impact value, and passed the test.
  • Example 19 the Fe content was excessive and the impact value was unacceptable.
  • Example 21 had too little O content and low tensile strength, and was rejected.
  • No. Examples 23 to 25 are examples in which the Ti-Al-Fe-Cu alloy further contains Sn.
  • Examples of No. 24 include Al: 4.6-8.0%, Fe: 0.2-1.5%, Cu: 0.3-2.0%, O: 0.03-0.20%, Sn : 5.0% or less, and satisfied the strength, impact value, and formula (1) representing the relationship between strength and impact value, and passed the test.
  • No. In example No. 25 the Sn content was excessive and the impact value was unacceptable.
  • Examples 26 to 28 are examples in which the Ti-Al-Fe-Cu alloy further contains Si.
  • Examples 26 and 27 are Al: 4.6-8.0%, Fe: 0.2-1.5%, Cu: 0.3-2.0%, O: 0.03-0.20% , Si: 0.80% or less, and satisfied all of the strength, impact value, and formula (1) showing the relationship between strength and impact value, and passed the test.
  • the Si content was excessive and the impact value was unacceptable.
  • Examples 29 and 30 are examples in which Nb is contained in a Ti-Al-Fe-Cu-Si alloy.
  • No. Examples 29 and 30 are Al: 4.6-8.0%, Fe: 0.2-1.5%, Cu: 0.3-2.0%, O: 0.03-0.20% , Si: 0.80% or less, Nb: 8.0% or less, and satisfied all of the strength, impact value, and formula (1) showing the relationship between strength and impact value, and was passed.
  • Examples 31 to 33 are examples in which the Ti-Al-Fe-Cu alloy further contains Nb.
  • Examples 31 and 32 are Al: 4.6-8.0%, Fe: 0.2-1.5%, Cu: 0.3-2.0%, O: 0.03-0.20% , Nb: 8.0% or less, and satisfied the strength, impact value, and formula (1) representing the relationship between strength and impact value, and was passed.
  • the Nb content was excessive and the impact value was unacceptable.
  • No. Nos. 34 to 36 are examples in which the Ti-Al-Fe-Cu alloy further contains Mo.
  • No. 34 and no. Examples of No. 35 include Al: 4.6-8.0%, Fe: 0.2-1.5%, Cu: 0.3-2.0%, O: 0.03-0.20%, Mo :2.0% or less, and satisfied the strength, impact value, and formula (1) representing the relationship between strength and impact value, and passed the test.
  • No. In example 36 the Mo content was excessive and the impact value was unacceptable.
  • Example No. 44 has a cooling rate of 0.1°C/sec in the range of 1000 to 700°C, a slow cooling rate, and an equation showing the average value of major axis length, strength, and the relationship between strength and impact value. (1) failed.
  • Example 2 A 200 kg ingot was forged to produce a billet with a diameter of 100 mm. Next, the billet with a diameter of 100 mm was heated to 950° C. and then rolled to produce a bar with a diameter of 9.5 mm. A bar with a diameter of 9.5 mm was repeatedly subjected to annealing at a temperature of 750° C. for 5 to 60 minutes and wire drawing using a cassette roller die or die drawing to obtain a bar with a diameter of 4.8 mm or 1.2 mm. Each material was annealed at a temperature of 750° C. for 1 hour, and then cooled in air to obtain a wire rod.
  • the maximum diameter of each manufactured wire was measured using the following method. That is, the diametrical dimension of the wire rod was measured at two or more locations per cross section and at least two cross sections for each lot using a micrometer or caliper, and the maximum value was taken as the maximum diameter.
  • a tensile test was conducted on each wire rod.
  • a round bar test piece with a parallel portion of 6.25 mm x 32 mm and a gauge distance of 25 mm was used.
  • the tensile speed was 10 mm/min at room temperature (25° C.).
  • a round bar test piece with a parallel portion of 3 x 20 mm was used.
  • the tensile speed was 6 mm/min and the test was carried out at room temperature (25°C).
  • test pieces with a gage distance of 100 mm were used without machining.
  • the tensile speed was 30 mm/min at room temperature (25° C.).
  • Vickers hardness was measured at the center of the cross section perpendicular to the long axis of each material under a load of 1 Kgf (9.8 N) in accordance with JIS Z 2244:2020.
  • Table 3 shows the chemical composition of each titanium material, and Table 4 shows the results of tensile strength and Vickers hardness measurements. Note that "-" in Table 3 indicates that the alloying element was not actively included.
  • the base material was a titanium alloy plate with a thickness of 12.7 mm.
  • a modeling area set in advance on the base material was surrounded by a chamber and shielded with Ar gas at a flow rate of 15 L/min. While supplying the titanium alloy wire produced in Example 2 at a speed of 200 mm/min, the wire was melted with a plasma welding torch and further solidified on the base material.
  • the cooling rate when the temperature of the titanium alloy base material was in the range of 1000 to 700°C was 10°C/sec.
  • the cooling rate in the range below 700°C was 2°C/sec.
  • a titanium alloy material consisting of an additively manufactured sample with a width of 18 mm, a length of 100 mm, and a thickness of 15 mm was produced on a base material by performing a lamination process in which such operations were repeated multiple times.
  • the aspect ratio of the ⁇ phase, the average long axis length of the ⁇ phase, the tensile strength, and the impact value of each titanium alloy material were evaluated in the same manner as in Example 1. The results are shown in Table 5.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un matériau de titane qui a une composition chimique prédéterminée, et comprend au moins partiellement une phase α et une phase β en tant que structures métalliques. Une moyenne des longueurs d'axe majeur d'approximations elliptiques de la phase α est comprise entre 20 µm (inclus) et 80 µm (inclus). Une moyenne des rapports d'aspect de la phase α est comprise entre 3,0 (inclus) et 5,0 (inclus). Une valeur d'impact CIS obtenue par division d'une énergie d'absorption d'impact obtenue par l'essai de Charpy à 25 °C par la surface de section transversale d'une éprouvette est supérieure ou égale à 40 J/cm2. Une résistance à la traction TS est supérieure ou égale à 900 MPa. La valeur d'impact CIS et la résistance à la traction TS satisfont 0,3 × TS + CIS ≥ 340.
PCT/JP2022/013076 2022-03-22 2022-03-22 Matériau d'alliage de titane, matériau de fil d'alliage de titane, matériau de poudre d'alliage de titane et procédé de production de matériau d'alliage de titane WO2023181104A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/013076 WO2023181104A1 (fr) 2022-03-22 2022-03-22 Matériau d'alliage de titane, matériau de fil d'alliage de titane, matériau de poudre d'alliage de titane et procédé de production de matériau d'alliage de titane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/013076 WO2023181104A1 (fr) 2022-03-22 2022-03-22 Matériau d'alliage de titane, matériau de fil d'alliage de titane, matériau de poudre d'alliage de titane et procédé de production de matériau d'alliage de titane

Publications (1)

Publication Number Publication Date
WO2023181104A1 true WO2023181104A1 (fr) 2023-09-28

Family

ID=88100201

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/013076 WO2023181104A1 (fr) 2022-03-22 2022-03-22 Matériau d'alliage de titane, matériau de fil d'alliage de titane, matériau de poudre d'alliage de titane et procédé de production de matériau d'alliage de titane

Country Status (1)

Country Link
WO (1) WO2023181104A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010007166A (ja) * 2008-06-30 2010-01-14 Daido Steel Co Ltd 鋳造用α＋β型チタン合金及びこれを用いたゴルフクラブヘッド
JP2021130861A (ja) * 2020-02-21 2021-09-09 日本製鉄株式会社 α＋β型チタン合金棒材の製造方法
WO2021251145A1 (fr) * 2020-06-10 2021-12-16 国立大学法人大阪大学 Alliage à système multi-constituant

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010007166A (ja) * 2008-06-30 2010-01-14 Daido Steel Co Ltd 鋳造用α＋β型チタン合金及びこれを用いたゴルフクラブヘッド
JP2021130861A (ja) * 2020-02-21 2021-09-09 日本製鉄株式会社 α＋β型チタン合金棒材の製造方法
WO2021251145A1 (fr) * 2020-06-10 2021-12-16 国立大学法人大阪大学 Alliage à système multi-constituant

Similar Documents

Publication Publication Date Title
US11555229B2 (en) High-strength aluminum alloy laminated molding and production method therefor
CN113862543B (zh) 合金部件的制造方法
JP7314184B2 (ja) アルミニウム合金からなる部品の製造方法
US11603583B2 (en) Ribbons and powders from high strength corrosion resistant aluminum alloys
US20170120386A1 (en) Aluminum alloy products, and methods of making the same
CN111699063B (zh) 制造铝-铬合金零件的方法
CN109072344B (zh) 钛、铝、钒和铁的bcc材料及由其制成的产品
US20220088681A1 (en) Method for manufacturing an aluminum alloy part
EP3844313B1 (fr) Alliage de titane à haute résistance pour fabrication additive
EP3481971A1 (fr) Rubans et poudres à base d'alliages d'aluminium haute résistance résistants à la corrosion
Hosseinzadeh et al. Severe plastic deformation as a processing tool for strengthening of additive manufactured alloys
EP4083244A1 (fr) Matériau à base d'aluminium en poudre résistant à la chaleur
CN113423524B (zh) 制造铝合金零件的方法
US11421303B2 (en) Titanium alloy products and methods of making the same
Casati et al. Effect of different heat treatment routes on microstructure and mechanical properties of AlSi7Mg, AlSi10Mg and Al-Mg-Zr-Sc alloys produced by selective laser melting
Gong et al. Laser energy density dependence of performance in additive/subtractive hybrid manufacturing of 316L stainless steel
EP3903971A1 (fr) Aciers auto-trempés pour la fabrication additive
WO2023181104A1 (fr) Matériau d'alliage de titane, matériau de fil d'alliage de titane, matériau de poudre d'alliage de titane et procédé de production de matériau d'alliage de titane
WO2019191450A1 (fr) Alliages d'aluminure de titane, produits en alliage d'aluminure de titane et leurs procédés de fabrication
Wen et al. Tailored microstructure and robust joint of Inconel 718/316L bimetallic multi-material fabricated by selective laser melting
JP2022110396A (ja) チタン合金材及びその製造方法
US20240158892A1 (en) Al-Mn-Zr BASED ALLOYS FOR HIGH TEMPERATURE APPLICATIONS
US20230313345A1 (en) Aluminum Alloy Compositions, Articles Therefrom, and Methods of Producing Articles Therefrom
US20230332278A1 (en) Alloy Material, Alloy Product Formed of Alloy Material, and Mechanical Device Including Alloy Product
Kannan et al. Understanding the microstructural evolution and fatigue behavior of aluminum 2319 fabricated by wire arc additive manufacturing

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22933253

Country of ref document: EP

Kind code of ref document: A1