WO2012115242A1 - 冷延性及び冷間での取扱性に優れたα+β型チタン合金板とその製造方法 - Google Patents
冷延性及び冷間での取扱性に優れたα+β型チタン合金板とその製造方法 Download PDFInfo
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- WO2012115242A1 WO2012115242A1 PCT/JP2012/054625 JP2012054625W WO2012115242A1 WO 2012115242 A1 WO2012115242 A1 WO 2012115242A1 JP 2012054625 W JP2012054625 W JP 2012054625W WO 2012115242 A1 WO2012115242 A1 WO 2012115242A1
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 76
- 238000004519 manufacturing process Methods 0.000 title claims description 24
- 238000005097 cold rolling Methods 0.000 claims abstract description 66
- 238000005098 hot rolling Methods 0.000 claims abstract description 55
- 239000013078 crystal Substances 0.000 claims abstract description 15
- 239000010936 titanium Substances 0.000 claims description 31
- 230000009466 transformation Effects 0.000 claims description 30
- 230000009467 reduction Effects 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 17
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 description 29
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 27
- 238000012360 testing method Methods 0.000 description 22
- 239000000463 material Substances 0.000 description 16
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- 238000005096 rolling process Methods 0.000 description 12
- 229910045601 alloy Inorganic materials 0.000 description 11
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
Definitions
- the present invention relates to an ⁇ + ⁇ type titanium alloy plate that is excellent in manufacturability such as a crack that is difficult to progress in the plate width direction in a coil during cold rolling or after cold rolling and that has low deformation resistance during cold rolling, and a method for manufacturing the same.
- ⁇ + ⁇ type titanium alloys have been used as aircraft components by utilizing high specific strength.
- the weight ratio of titanium alloys used for aircraft components has increased, and its importance has been increasing.
- ⁇ + ⁇ type titanium alloys characterized by high Young's modulus and light specific gravity have been widely used for applications for golf club faces.
- high-strength ⁇ + ⁇ -type titanium alloys is expected for automotive parts where weight reduction is important in the future, or geothermal well casings that require corrosion resistance and specific strength.
- titanium alloys are often used in the form of plates, there is a great need for high-strength ⁇ + ⁇ -type titanium alloy plates.
- Ti-6% Al-4% V (% is mass%, the same applies hereinafter) is the most widely used alloy. Inter-rolling is not possible, and it is generally manufactured by hot sheet rolling or pack rolling. However, in hot sheet rolling or pack rolling, it is difficult to obtain precise plate thickness accuracy, and in these manufacturing processes, product yield is low and high quality thin plate products can be manufactured at low cost. Was difficult.
- Patent Documents 1 and 2 propose low-alloy ⁇ + ⁇ -type titanium alloys containing Fe, O, and N as main additive elements.
- This titanium hot-rolled alloy is an alloy that secures a high strength and ductility balance by adding Fe as a ⁇ -stabilizing element and adding inexpensive elements such as O and N as ⁇ -stabilizing elements in an appropriate range and balance. It is.
- the titanium hot-rolled alloy is highly ductile at room temperature, so that it can be used for manufacturing cold-rolled products.
- Patent Document 3 adds Al that contributes to high strength but reduces ductility and decreases cold workability, while adding Si and C that are effective in increasing strength but do not impair cold rollability. A technique that enables cold rolling is disclosed. Patent Documents 4 to 8 disclose techniques for improving mechanical properties by adding Fe and O and controlling crystal orientation or crystal grain size.
- the broken plate If the plate breaks during cold rolling or during coil unwinding, the broken plate must be removed from the production line, but it takes time to perform this removal. Inhibited and production efficiency decreases. Furthermore, there is a safety problem such that the plate itself or a broken piece of the broken plate suddenly flies due to the impact at the time of breaking the plate.
- the deformation resistance at room temperature is high, and a high load is required to reduce the plate thickness by cold rolling.
- the material for cold rolling is a hot rolling texture in which the bottom surface of the titanium ⁇ phase is oriented in a direction close to the normal direction of the plate surface (“Basal-texture”). If it has a “texture”, deformation in the thickness direction becomes difficult.
- Patent Document 9 discloses a technology for starting hot rolling in the ⁇ region in order to refine crystal grains in pure titanium and prevent the generation of wrinkles and scratches.
- Patent Document 10 discloses a Ti—Fe—Al—O-based ⁇ + ⁇ type casting titanium alloy for a golf club head.
- Patent Document 11 discloses a Ti—Fe—Al based ⁇ + ⁇ type titanium alloy.
- Patent Document 12 discloses a titanium alloy for a golf club head in which Young's modulus is controlled by final finishing heat treatment.
- Non-Patent Document 1 discloses that in pure titanium, a texture is formed by unidirectional rolling in the ⁇ region after heating in the ⁇ region.
- the present invention suppresses the occurrence of plate breakage caused by the development of ear cracks during cold rolling or after cold rolling in the manufacture of ⁇ + ⁇ type titanium alloy plates, and reduces the thickness reduction rate during cold rolling.
- the object is to keep (%) high, and an object is to provide an ⁇ + ⁇ -type titanium alloy plate that solves the problem and a method for producing the same.
- the present inventors paid attention to a hot-rolled texture that greatly affects ductility, and conducted an intensive investigation on the relationship between the progress of cracks in the plate width direction and the hot-rolled texture in an ⁇ + ⁇ -type titanium alloy plate. did. As a result, I found the following.
- (X) A heat in which the titanium ⁇ phase having a hexagonal close packed structure is strongly oriented in the normal direction of the hexagonal bottom surface ((0001) plane), that is, the c-axis direction is in the TD direction (hot rolling width direction). If the rolled texture (the texture called “Transverse-texture”, hereinafter referred to as “T-texture”) is stabilized, cracks in the plate width direction will hardly progress in the coil during or after cold rolling. , The plate breakage hardly occurs. (Y) When the T-texture is stabilized, the deformation resistance during cold rolling is reduced and the ductility in the longitudinal direction is improved, so that the handleability when the coil is rewound cold is improved.
- T-texture Transverse-texture
- the present invention has been made based on the above findings, and the gist thereof is as follows.
- ⁇ + ⁇ type titanium alloy hot-rolled sheet (A) The normal direction of the hot rolled sheet is the ND direction, the hot rolling direction is the RD direction, the hot rolling width direction is the TD direction, and the normal direction of the (0001) plane of the ⁇ phase is the c-axis direction.
- the angle between the c-axis orientation and the ND direction is ⁇ , and the angle between the surface including the c-axis orientation and the ND direction and the surface including the ND direction and the TD direction is ⁇ , (B1) The strongest intensity among the (0002) reflection relative intensities of X-rays by crystal grains in which ⁇ is 0 degree or more and 30 degrees or less and ⁇ enters the entire circumference ( ⁇ 180 degrees to 180 degrees).
- XND XND
- (B2) Among the (0002) reflected relative intensities of X-rays by crystal grains in which ⁇ is 80 degrees or more and less than 100 degrees and ⁇ enters ⁇ 10 degrees, the strongest intensity is defined as XTD.
- (C) An ⁇ + ⁇ -type titanium alloy hot-rolled plate excellent in cold-rollability and cold handleability, wherein XTD / XND is 5.0 or more.
- Q (%) [O] + 2.77 ⁇ [N] + 0.1 ⁇ [Fe] (1) [O]: O content (% by mass) [N]: N content (% by mass) [Fe]: Fe content (% by mass)
- the plate breakage caused by the progress of the ear cracks during cold rolling or in the coil unwinding process after cold rolling is less likely to occur, the deformation resistance during cold rolling is small, and the plate thickness is reduced. It is possible to provide an ⁇ + ⁇ type titanium alloy plate capable of maintaining a high rate.
- FIG. 6 is a diagram showing crystal grains (hatched portions) where ⁇ between the c-axis orientation and the ND direction is 0 degree or more and 30 degrees or less and ⁇ enters the entire circumference ( ⁇ 180 degrees to 180 degrees). It is a figure which shows the crystal grain (hatching part) whose angle (theta) which c-axis azimuth
- FIG. 1A shows the relative orientation relationship between the crystal orientation and the plate surface.
- the normal direction of the hot rolled surface is the ND direction
- the hot rolled direction is the RD direction
- the hot rolled width direction is the TD direction
- the normal direction of the (0001) plane of the ⁇ phase is the c axis direction. Is defined as ⁇
- the angle between the plane including the c-axis direction and the ND direction and the plane including the ND direction and the TD direction is ⁇ .
- the heat that causes the hexagonal bottom surface ((0001) plane) of the titanium ⁇ phase having a hexagonal close packed structure (hereinafter sometimes referred to as “HCP”) to be strongly oriented in the plate width direction.
- HCP hexagonal close packed structure
- T-texture it has been found that cracks that propagate in the plate width direction tend to bend from the middle.
- the bottom surface of the HCP is strongly oriented in the direction parallel to or in the vicinity of the plate width direction, but at this time, cracks propagate along the plate width direction.
- plastic relaxation occurs at the crack tip, and the propagation direction of the crack changes from the plate width direction to the direction close to the plate longitudinal direction.
- the present inventors have compared the degree of integration of the bottom surface of the HCP in the plate width direction and the bending degree of cracks to be propagated in the plate width direction. It was found that the phenomenon of propagating straight forward was less likely to occur.
- the difficulty of propagation of cracks in the plate width direction is determined by forming a V-notch in a direction corresponding to the plate width direction on a Charpy impact test piece prepared with the rolling direction of the alloy plate as the longitudinal direction of the test piece.
- a Charpy impact test can be performed at, and evaluation can be made by the length of cracks that develop from the bottom of the notch.
- FIG. 5 shows a fracture path in the Charpy impact test piece.
- the length of the perpendicular line perpendicular to the longitudinal direction of the test piece from the notch bottom 3 of the notch 2 formed in the Charpy impact test piece 1 is a, and the length of the crack actually propagated is b.
- the crack which propagates a test piece does not necessarily advance in one specific direction, and may bend and advance zigzag. In either case, b represents the entire length of the fracture path.
- the strength in the longitudinal direction of the plate is lowered and cold rolling becomes easy, and the thickness reduction rate can be increased.
- column surface slipping in the main slip system is activated as a characteristic of plastic deformation behavior during cold rolling. Decrease. Since the increase in work hardening index during deformation by this slip system is smaller than that of other slip systems, the increase in deformation resistance does not occur rapidly.
- Non-Patent Document 1 describes that the anisotropy of yield stress is larger in T-texture than in B-texture in the case of pure titanium. ing. In the case of pure titanium, the yield stress in the plate width direction differs greatly between B-texture and T-texture, but the yield stress in the plate longitudinal direction is almost the same.
- the strength in the longitudinal direction is lowered and the ductility is improved, so that the handling property of the ⁇ + ⁇ type titanium alloy plate is improved.
- the present inventors have found out.
- the present inventors have found that in ⁇ + ⁇ type titanium alloys, the hot rolling heating temperature at which strong T-texture is obtained is in a specific temperature range in the ⁇ single phase region, and the hot rolling start temperature is set in the ⁇ single phase. As a region, I found out that it is more effective in forming a strong T-texture.
- This temperature range is higher than the normal hot rolling temperature of the ⁇ + ⁇ type titanium alloy ( ⁇ + ⁇ 2 phase heating hot rolling temperature), so that good hot workability is maintained and at both edges during hot rolling. There is also an effect that the temperature drop is small and ear cracks are less likely to occur.
- Patent Document 3 discloses an improvement in cold workability due to the effect of addition of Si or C, but the hot rolling condition is that heating is performed in the ⁇ region, but rolling is performed in the ⁇ + ⁇ region.
- the improvement of cold workability is not due to the texture like T-texture.
- Non-Patent Document 1 discloses that pure titanium is heated to a ⁇ temperature range and then a texture similar to that of T-texture is formed. Unlikely, rolling is started in the ⁇ temperature range. Furthermore, Non-Patent Document 1 does not describe the effect of suppressing cracking during hot rolling.
- Patent Document 9 discloses a technique for starting hot rolling of pure titanium in the ⁇ temperature range. This technique aims to prevent generation of wrinkles and scratches by refining crystal grains. The object is greatly different from the object of the present invention, and the evaluation of the texture and the suppression of cracking are not disclosed.
- the present invention is directed to an ⁇ + ⁇ type titanium alloy containing 0.5 to 1.5 mass% of Fe and containing Fe, O, and N in specified amounts, pure titanium or titanium close to pure titanium is used. It is technically different from the technology related to alloys.
- Patent Document 10 discloses a Ti—Fe—Al—O type ⁇ + ⁇ type titanium alloy for golf club heads, which is a titanium alloy for casting. Are substantially different.
- Patent Document 11 discloses an ⁇ + ⁇ type titanium alloy containing Fe and Al, but does not disclose evaluation of texture and suppression of cracking. In this respect, the present invention is technically It is very different.
- Patent Document 12 discloses a titanium alloy for golf club heads having a component composition similar to that of the present invention, and is characterized in that Young's modulus is controlled by a final finish heat treatment. The conditions, the handleability of the hot rolled sheet coil, and the texture are not disclosed.
- Patent Documents 10 to 12 are different from the present invention in terms of purpose and characteristics.
- the present inventors have investigated in detail the effect of hot-rolling texture on the coldness of titanium alloy coils, and as a result, by stabilizing T-texture, In the coil, cracks are less likely to progress in the plate width direction, plate breakage is less likely to occur, and deformation resistance during cold rolling is low and ductility in the longitudinal direction is improved. I found it improved.
- the present invention has been made based on this finding, and the present invention will be described in detail below.
- the hot-rolled sheet of the present invention The reason for limiting the texture of the titanium ⁇ phase in the ⁇ + ⁇ type titanium alloy hot-rolled sheet of the present invention (hereinafter sometimes referred to as “the hot-rolled sheet of the present invention”) will be described.
- the degree of texture development was evaluated using the ratio of X-ray (0002) reflection relative intensity, which is reflection from the ⁇ -phase bottom ((0001) plane), obtained by X-ray diffraction.
- FIG. 2 shows an example of a (0002) pole figure showing the accumulation orientation of the ⁇ -phase bottom ((0001) plane).
- This (0002) pole figure is a typical example of T-texture. 2 that the ⁇ -phase bottom ((0001) plane) is strongly oriented in the plate width direction.
- FIG. 3 schematically shows measurement positions of XTD and XND in the (0002) pole figure.
- XTD is the normal direction of the plate from the plate width direction on the (0002) pole figure of (a) titanium when the texture in the plate surface direction is analyzed by X-ray.
- X-ray relative intensity peak value within an azimuth angle tilted from 0 to 10 ° and within an azimuth angle rotated ⁇ 10 ° from the plate width direction with the normal direction of the plate as the central axis
- XND is X-ray relative intensity peak values within an azimuth angle tilted from 0 to 30 ° in the plate width direction from the normal direction of the plate and within an azimuth angle rotated all around the plate normal.
- a value (hardness anisotropy index) obtained by dividing the hardness of the cross section perpendicular to the TD direction by the hardness of the cross section perpendicular to the RD direction was used as an index of ease of cold rolling. The smaller this value is, the more difficult it is to deform in the longitudinal direction of the plate, that is, it is difficult to cold-roll.
- FIG. 4 shows the relationship between the X-ray anisotropy index and the hardness anisotropy index.
- the X-ray anisotropy index at that time is 5.0 or more, more preferably 7.0 or more.
- % related to the component composition means mass%.
- Fe is an inexpensive element among the ⁇ -phase stabilizing elements, Fe is added to strengthen the ⁇ -phase by solid solution. In order to improve cold-rollability, it is necessary to obtain a strong T-texture with a hot-rolled texture. For that purpose, it is necessary to obtain a ⁇ phase stable at a hot rolling heating temperature at an appropriate volume ratio.
- Fe has a higher ⁇ -stabilizing ability than other ⁇ -stabilizing elements and can stabilize the ⁇ -phase even with a relatively small addition amount, so the addition amount is reduced compared to other ⁇ -stabilizing elements. be able to. Therefore, the degree of solid solution strengthening by Fe at room temperature is small, and the titanium alloy can maintain high ductility, and as a result, cold ductility can be ensured. In order to obtain a ⁇ phase that is stable in the hot rolling temperature range at an appropriate volume ratio, it is necessary to add 0.8% or more of Fe.
- Fe is easily segregated in Ti, and when added in a large amount, solid solution strengthening occurs, ductility is lowered, and cold rolling is lowered. Considering these effects, the upper limit of the Fe addition amount is 1.5%.
- N is dissolved as an interstitial element in the ⁇ phase and has a solid solution strengthening action. However, if it is added over 0.020% by a normal method such as using a sponge titanium containing a high concentration of N, an undissolved inclusion called LDI is likely to be generated, and the yield of the product is lowered. , N has an upper limit of 0.020%.
- the coefficient of [N] 2.77 and the coefficient [0.1] of [Fe] are coefficients indicating the degree of contribution to the strength increase, and are empirically based on many experimental data. It is a fixed value.
- the Q value When the Q value is less than 0.34, it is generally impossible to obtain a strength of about 700 MPa or more, which is required for the ⁇ + ⁇ type titanium alloy. On the other hand, when the Q value exceeds 0.55, the strength increases. However, the ductility is lowered and the cold-rollability is slightly lowered. Accordingly, the Q value has a lower limit of 0.34 and an upper limit of 0.55.
- Patent Document 4 a titanium alloy having a component composition similar to that of the hot-rolled sheet of the present invention is disclosed in Patent Document 4, this titanium alloy is mainly made of material anisotropy in order to improve cold stretch formability.
- the alloy plate of the present invention forms T-texture and ensures high material anisotropy
- the amount of O is lower than that of the hot rolled sheet of the present invention.
- the present invention is substantially different from the present invention in that the strength level is low.
- the production method of the present invention is particularly a production method for developing T-texture and improving cold-rollability.
- the production method of the present invention is a method of producing a thin plate having the crystal orientation and titanium alloy component of the hot-rolled sheet of the present invention, and the heating temperature before hot rolling is changed from ⁇ transformation point + 20 ° C. to ⁇ transformation point + 150 ° C. or less. And unidirectional hot rolling at a finishing temperature of ⁇ transformation point ⁇ 50 ° C. or lower to ⁇ transformation point ⁇ 250 ° C. or higher.
- the titanium alloy is heated to the ⁇ single phase region, held for 30 minutes or more, and once in the ⁇ single phase state, Furthermore, it is necessary to apply a large reduction in which the plate thickness reduction rate defined by the following formula is 90% or more from the ⁇ single phase region to the ⁇ + ⁇ 2 phase region.
- the ⁇ transformation temperature can be measured by differential thermal analysis. Test pieces prepared by vacuum melting and forging 10 or more kinds of materials with a changed composition of Fe, N, and O within a range of the component composition to be manufactured in advance and a laboratory level small amount. In each case, the ⁇ ⁇ ⁇ transformation start temperature and the transformation end temperature are investigated by a differential thermal analysis method in which each is gradually cooled from a ⁇ single phase region of 1100 ° C.
- the heating temperature is less than ⁇ transformation point + 20 ° C. or the finishing temperature is less than ⁇ transformation point ⁇ 200 ° C.
- ⁇ ⁇ ⁇ phase transformation occurs during hot rolling, and the ⁇ phase fraction is high.
- a strong reduction is applied, and the reduction in the two-phase state with a high ⁇ -phase fraction becomes insufficient, and the T-texture does not develop sufficiently.
- the finishing temperature is lower than the ⁇ transformation point of ⁇ 200 ° C.
- the hot deformation resistance is suddenly increased and the hot workability is lowered, so that ear cracks occur frequently, resulting in a decrease in yield. . Therefore, the lower limit of the heating temperature at the time of hot rolling needs to be ⁇ transformation point + 20 ° C., and the lower limit of the finishing temperature needs to be ⁇ transformation point ⁇ 200 ° C. or more.
- the reduction ratio (plate thickness reduction rate) from the ⁇ single phase region to the ⁇ + ⁇ 2 phase region at this time is less than 90%, the processing strain introduced is not sufficient, and the strain is uniform over the entire plate thickness. Since it is difficult to introduce, T-texture may not be sufficiently developed. Therefore, the sheet thickness reduction rate during hot rolling needs to be 90% or more.
- the heating temperature during hot rolling exceeds the ⁇ transformation point + 150 ° C.
- the ⁇ grains are rapidly coarsened.
- the hot rolling is mostly performed in the ⁇ single phase region, and coarse ⁇ grains are stretched in the rolling direction, and from there, ⁇ ⁇ ⁇ phase transformation occurs, so that T-texture is hardly developed.
- the upper limit of the heating temperature during hot rolling is ⁇ transformation point + 150 ° C.
- the lower limit is ⁇ transformation point + 20 ° C.
- the upper limit of the finishing temperature during hot rolling is set to ⁇ transformation point ⁇ 50 ° C.
- the finishing temperature is set to a ⁇ transformation point of ⁇ 50 ° C. or lower to a ⁇ transformation point of ⁇ 250 ° C. or higher.
- the hot rolling under the above conditions is a higher temperature than the ⁇ + ⁇ region heating hot rolling, which is a normal hot rolling condition of ⁇ + ⁇ type titanium alloy, the temperature drop at both ends of the plate can be suppressed.
- good hot workability is maintained at both ends of the plate, and the occurrence of ear cracks is suppressed.
- the reason why the rolling is consistently performed in only one direction from the start to the end of hot rolling is that the purpose of the present invention is to suppress the progress of cracks in the plate width direction at the time of cold rolling or after cold rolling. This is because the deformation resistance during cold rolling is kept low, and a T-texture that can improve the ductility in the longitudinal direction of the plate can be obtained efficiently.
- a titanium alloy thin plate coil that is less likely to break during cold rolling and after cold rolling, has low strength in the longitudinal direction of the plate, is easy to cold-roll, and has high ductility in the longitudinal direction of the plate, so that it can be easily rewound. Can be obtained.
- the conditions in the examples are one example of conditions used for confirming the feasibility and effects of the present invention, and the present invention is based on this one example of conditions. It is not limited.
- the present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.
- Example 1 A titanium material having the composition shown in Table 1 is melted by a vacuum arc melting method, this is hot forged into a slab, heated to 940 ° C., and then hot rolled with a sheet thickness reduction rate of 97% to 3 mm. The hot rolled sheet was used. The finishing temperature of hot rolling was 790 ° C.
- This hot-rolled sheet is pickled to remove the oxide scale, and a tensile test piece is collected to examine the tensile characteristics and X-ray diffraction (using RINT2500, manufactured by Rigaku Corporation, Cu-K ⁇ , voltage 40 kV, current 300 mA). The texture in the plate surface direction was measured.
- the azimuth angle rotated within ⁇ 10 ° from the plate width direction with the normal direction of the plate as the central axis within the azimuth angle inclined from 0 to 10 ° from the plate width direction to the normal direction of the plate The X-ray relative intensity peak value XTD (see FIG. 1C) and the azimuth angle (see FIG. 1B) inclined from 0 to 30 ° in the plate width direction from the normal direction of the plate and the plate
- the ratio of X-ray relative intensity peak value XND within an azimuth angle rotated all around the normal axis as a central axis: XTD / XND was used as an X-ray anisotropy index to evaluate the degree of texture development.
- a value (hardness anisotropy index) obtained by dividing the hardness of the cross section perpendicular to the TD direction in the hot-rolled sheet by the hardness of the cross section perpendicular to the RD direction was used. If the hardness anisotropy index is 0.85 or less, the deformation resistance in the sheet thickness direction is small, so that it can be evaluated that the cold rolling property is good.
- test numbers 1 and 2 show the results relating to the ⁇ + ⁇ type titanium alloy manufactured by the process including the rolling in the sheet width direction by hot rolling.
- the hardness anisotropy index is 0.85 or less, the deformation resistance during cold rolling is high, and it is difficult to increase the cold rolling rate.
- the breaking skewness index is considerably lower than 1.20, the breaking path in the plate width direction is short, and the plate is easily broken.
- the value of XTD / XND is less than 5.0, and T-texture is not developed.
- test numbers 4, 5, 8, 10, 11, 13, and 14 which are examples of the hot-rolled sheet of the present invention manufactured by the manufacturing method of the present invention
- the hardness anisotropy index is 0.85.
- the steel sheet exhibits good cold-rollability, has a breaking skewness index exceeding 1.20, has a characteristic that the crack is skewed in the sheet width direction, and has a characteristic that the sheet is hardly broken.
- the hardness was evaluated based on Vickers hardness according to JIS Z2244.
- test numbers 3 and 7 the strength is lower than other materials, and generally, the tensile strength of 700 MPa required for the ⁇ + ⁇ type titanium alloy is not achieved.
- test number 3 since the addition amount of Fe was below the lower limit of the addition amount of Fe in the hot-rolled sheet of the present invention, the tensile strength was low.
- Test No. 7 particularly, the contents of nitrogen and oxygen were low, and the oxygen equivalent value Q was below the lower limit of the specified amount, so the tensile strength did not reach a sufficiently high level.
- Test No. 12 was not able to evaluate characteristics because many defects occurred in many parts of the hot-rolled sheet and the product yield was low. This is because LDI occurred frequently because N was added in excess of the upper limit of the present invention by a normal method using sponge titanium containing high N as a melting material.
- the titanium alloy plate having the element content and XTD / XND defined in the present invention the cracks in the plate width direction are skewed and the path is extended, and the plate is difficult to break, Low deformation resistance at the time of cold rolling and easy deformation in the longitudinal direction of the plate, so it is excellent in cold rolling properties, but strong material anisotropy when the amount of alloying elements defined in the present invention and XTD / XND are deviated And the accompanying cold-rolling property, such as the difficulty of the board fracture
- Example 2 The materials of test numbers 4, 8, and 14 in Table 1 were hot-rolled under various conditions shown in Tables 2 to 4, then pickled to remove the oxide scale, and then examined for tensile properties and X An azimuth angle tilted from 0 to 10 ° from the plate width direction on the (0002) pole figure of titanium to the normal direction of the plate by line diffraction (using RINT2500 manufactured by Rigaku Corporation, Cu-K ⁇ , voltage 40 kV, current 300 mA) The X-ray relative intensity peak value within the azimuth angle rotated ⁇ 10 ° from the plate width direction about the inner and plate normal directions as the central axis is XTD, and 0 to 30 ° from the plate normal direction to the plate width direction.
- the hardness anisotropy index is 0.85 or more, the deformation resistance in the plate thickness direction is small, and the cold rolling property is good.
- the hardness anisotropy index was used for evaluating the ease of deformation of the hot-rolled sheet in the thickness direction. Hardness was evaluated by Vickers hardness at 1 kgf load according to JIS Z2244. If the hardness anisotropy index is 15000 or more, the coil unwinding property is good. Tables 2 to 4 show the results of evaluating these characteristics.
- Tables 2, 3 and 4 show the evaluation results relating to the hot-rolled annealed plates having the component compositions shown in Test Nos. 4 and 8.
- Test numbers 15, 16, 22, 23, 29, and 30, which are examples of the hot-rolled sheet of the present invention manufactured by the manufacturing method of the present invention, show a hardness anisotropy index of 0.85 or more and 1 It has a breaking skewness index exceeding .20, has a good cold-rolling property, and has a characteristic that it is difficult to break the plate.
- the breaking skewness index is less than 1.20, and the plate breakage easily occurs. This is because the plate thickness reduction rate during hot rolling was lower than the lower limit of the present invention, so that T-texture could not be sufficiently developed, and cracks in the plate width direction were easy to progress straight in the plate width direction. is there.
- Test numbers 18, 19, 20, 21, 25, 26, 27, 28, 31, 32, 33, and 34 have an X-ray anisotropy index of less than 5.0 and a hardness anisotropy index of Below 0.85, the breaking skewness index is also below 1.20.
- test numbers 18, 25, and 32 had a heating temperature before hot rolling lower than the lower limit temperature of the present invention
- test numbers 20, 27, and 34 had hot rolling finishing temperatures of the present invention.
- the hot working in the ⁇ + ⁇ 2 phase region having a sufficiently high ⁇ -phase fraction was not sufficient, and T-texture could not be sufficiently developed.
- Test Nos. 19, 26, and 33 have heating temperatures before hot rolling exceeding the upper limit temperature of the present invention
- Test Nos. 21, 28, and 35 have hot rolling finishing temperatures of upper limit temperatures of the present invention.
- most of the processing was carried out in the ⁇ single-phase region, and T-texture was underdeveloped and destabilized due to hot rolling of coarse ⁇ grains, and the formation of coarse final microstructure was achieved.
- the hardness anisotropy index does not increase, and the fracture path does not extend.
- the titanium alloy having the texture and composition shown in the present invention is reduced in the thickness of the present invention. It turns out that it can manufacture by hot-rolling in a rate, hot-rolling heating temperature, and finishing temperature range.
- the present invention it is difficult to cause plate breakage caused by the development of ear cracks during cold rolling or in the coil rewinding process after cold rolling, and the deformation resistance during cold rolling is small.
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Abstract
Description
(y)T-textureを安定化すると、冷延時の変形抵抗が低下し、長手方向の延性が向上するので、コイルを冷間で巻き戻す時の取扱性が向上する。
(a)熱間圧延板の法線方向をND方向、熱間圧延方向をRD方向、熱間圧延幅方向をTD方向とし、α相の(0001)面の法線方向をc軸方位として、c軸方位がND方向となす角度をθ、c軸方位とND方向を含む面がND方向とTD方向を含む面となす角度をΦとし、
(b1)θが0度以上、30度以下であり、かつ、Φが全周(-180度~180度)に入る結晶粒によるX線の(0002)反射相対強度のうち、最も強い強度をXNDとし、
(b2)θが80度以上、100度未満であり、かつ、Φが±10度に入る結晶粒によるX線の(0002)反射相対強度のうち、最も強い強度をXTDとして、
(c)XTD/XNDが5.0以上である
ことを特徴とする冷延性及び冷間での取扱性に優れたα+β型チタン合金熱延板。
Q(%)=[O]+2.77・[N]+0.1・[Fe] ・・・(1)
[O]:Oの含有量(質量%)
[N]:Nの含有量(質量%)
[Fe]:Feの含有量(質量%)
板厚減少率(%)={(冷延前の板厚-冷延後の板厚)/冷延前の板厚}・100
Q=[O]+2.77・[N]+0.1・[Fe] ・・・(1)
Q=[O]+2.77・[N]+0.1・[Fe] ・・・(1)
[O]:Oの含有量(質量%)
[N]:Nの含有量(質量%)
[Fe]:Feの含有量(質量%)
板厚減少率(%)(={(冷延前の板厚-冷延後の板厚)/冷延前の板厚}・100)
真空アーク溶解法により、表1に示す組成を有するチタン材を溶解し、これを熱間鍛造してスラブとし、940℃に加熱し、その後、板厚減少率97%の熱間圧延により、3mmの熱延板とした。熱延の仕上温度は790℃であった。
表1の試験番号4、8、及び、14の素材を、表2~4に示す種々の条件で熱延した後、酸洗して酸化スケールを除去し、その後、引張特性を調べるとともに、X線回折(株式会社リガク製RINT2500使用、Cu-Kα、電圧40kV、電流300mA)により、チタンの(0002)極点図上の板幅方向から板の法線方向に0~10°まで傾いた方位角内及び板の法線方向を中心軸として板幅方向から±10°回転させた方位角内でのX線相対強度ピーク値をXTD、板の法泉方向から板幅方向に0~30°まで傾いた方位角内及び板の法線を中心軸として全周回転させた方位角内でのX線相対強度ピーク値をXNDとした時に、それらの比:XTD/XNDをX線異方性指数として、集合組織の発達程度を評価した。
2 ノッチ
3 ノッチ底
a ノッチ底から垂直に下した垂線の長さ
b 実際の破断経路の長さ
Claims (3)
- α+β型チタン合金熱延板であって、
(a)熱間圧延板の法線方向をND方向、熱間圧延方向をRD方向、熱間圧延幅方向をTD方向とし、α相の(0001)面の法線方向をc軸方位として、c軸方位がND方向となす角度をθ、c軸方位とND方向を含む面がND方向とTD方向を含む面となす角度をΦとし、
(b1)θが0度以上、30度以下であり、かつ、Φが全周(-180度~180度)に入る結晶粒によるX線の(0002)反射相対強度のうち、最も強い強度をXNDとし、
(b2)θが80度以上、100度未満であり、かつ、Φが±10度に入る結晶粒によるX線の(0002)反射相対強度のうち、最も強い強度をXTDとして、
(c)XTD/XNDが5.0以上である
ことを特徴とする冷延性及び冷間での取扱性に優れたα+β型チタン合金熱延板。 - 前記α+β型チタン合金熱延板が、質量%で、Fe:0.8~1.5%、N:0.020%以下を含有するとともに、下記式(1)で定義するQ(%)=0.34~0.55を満足する範囲のO、N、及び、Feを含有し、残部Ti及び不可避的不純物からなることを特徴とする請求項1に記載の冷延性及び冷間での取扱性に優れたα+β型チタン合金熱延板。
Q(%)=[O]+2.77・[N]+0.1・[Fe] ・・・(1)
[O]:Oの含有量(質量%)
[N]:Nの含有量(質量%)
[Fe]:Feの含有量(質量%) - 請求項1又は2に記載の冷延性及び冷間での取扱性に優れたα+β型チタン合金板の製造方法において、α+β型チタン合金を熱間圧延する際、熱間圧延前に、β変態点+20℃以上、β変態点+150℃以下に加熱し、熱延仕上温度を、β変態点-50℃以下、β変態点-200℃以上として、下記式で定義する板厚減少率が90%以上となるように、一方向熱間圧延を行うことを特徴とする冷延性及び冷間での取扱性に優れたα+β型チタン合金熱延板の製造方法。
板厚減少率(%)(={(冷延前の板厚-冷延後の板厚)/冷延前の板厚}・100)
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JPWO2015156356A1 (ja) * | 2014-04-10 | 2017-04-13 | 新日鐵住金株式会社 | 高強度・高ヤング率を有するα+β型チタン合金冷延焼鈍板およびその製造方法 |
WO2015156358A1 (ja) * | 2014-04-10 | 2015-10-15 | 新日鐵住金株式会社 | 管長手方向の強度、剛性に優れたα+β型チタン合金溶接管およびその製造方法 |
JP2016113640A (ja) * | 2014-12-11 | 2016-06-23 | 新日鐵住金株式会社 | 高強度チタン板およびその製造方法 |
WO2022162814A1 (ja) | 2021-01-28 | 2022-08-04 | 日本製鉄株式会社 | チタン合金薄板およびチタン合金薄板の製造方法 |
WO2022162816A1 (ja) | 2021-01-28 | 2022-08-04 | 日本製鉄株式会社 | チタン合金板およびチタン合金コイルならびにチタン合金板の製造方法およびチタン合金コイルの製造方法 |
KR20230110601A (ko) | 2021-01-28 | 2023-07-24 | 닛폰세이테츠 가부시키가이샤 | 티타늄 합금판 및 티타늄 합금 코일 그리고 티타늄 합금판의 제조 방법 및 티타늄 합금 코일의 제조 방법 |
KR20230118978A (ko) | 2021-01-28 | 2023-08-14 | 닛폰세이테츠 가부시키가이샤 | 티탄 합금 박판 및 티탄 합금 박판의 제조 방법 |
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TW201244844A (en) | 2012-11-16 |
US20130327449A1 (en) | 2013-12-12 |
CN103392019A (zh) | 2013-11-13 |
CN103392019B (zh) | 2015-07-08 |
KR101582271B1 (ko) | 2016-01-05 |
US9624566B2 (en) | 2017-04-18 |
JPWO2012115242A1 (ja) | 2014-07-07 |
KR20130122650A (ko) | 2013-11-07 |
JP5182452B2 (ja) | 2013-04-17 |
TWI551367B (zh) | 2016-10-01 |
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