CN114472897B - Gradient titanium alloy with low adiabatic shear sensitivity and preparation method thereof - Google Patents

Gradient titanium alloy with low adiabatic shear sensitivity and preparation method thereof Download PDF

Info

Publication number
CN114472897B
CN114472897B CN202210106019.9A CN202210106019A CN114472897B CN 114472897 B CN114472897 B CN 114472897B CN 202210106019 A CN202210106019 A CN 202210106019A CN 114472897 B CN114472897 B CN 114472897B
Authority
CN
China
Prior art keywords
titanium alloy
sides
gradient
adiabatic shear
shear sensitivity
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
CN202210106019.9A
Other languages
Chinese (zh)
Other versions
CN114472897A (en
Inventor
骆雨萌
刘睿
惠松骁
叶文君
于洋
宋晓云
李艳锋
韦芮
王博雅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GRIMN Engineering Technology Research Institute Co Ltd
Original Assignee
GRIMN Engineering Technology Research Institute Co Ltd
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 GRIMN Engineering Technology Research Institute Co Ltd filed Critical GRIMN Engineering Technology Research Institute Co Ltd
Priority to CN202210106019.9A priority Critical patent/CN114472897B/en
Publication of CN114472897A publication Critical patent/CN114472897A/en
Application granted granted Critical
Publication of CN114472897B publication Critical patent/CN114472897B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • 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
    • B22F10/30—Process control
    • B22F10/36—Process control of energy beam parameters
    • B22F10/366—Scanning parameters, e.g. hatch distance or scanning strategy
    • 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
    • B22F10/64—Treatment of workpieces or articles after build-up by thermal means
    • 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
    • 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
    • B22F10/80—Data acquisition or data processing
    • B22F10/85—Data acquisition or data processing for controlling or regulating additive manufacturing processes
    • 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
    • B33Y10/00—Processes of 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
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
    • B33Y40/20—Post-treatment, e.g. curing, coating or polishing
    • 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
    • B33Y50/00—Data acquisition or data processing for additive manufacturing
    • B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • 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
    • 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
    • B22F2207/00—Aspects of the compositions, gradients
    • B22F2207/01—Composition gradients
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)

Abstract

The invention relates to a gradient titanium alloy with low adiabatic shear sensitivity, wherein the thickness of the titanium alloy is 10 mm-50 mm, the plane size is 7 cm-50 cm, and the parallelism is 0.02-0.1; the titanium alloy has obvious component interfaces, and the components on two sides are different; the microstructure of the titanium alloy is characterized in that the two sides of the interface are Wittig structures, the original beta crystal grains at the two sides are columnar crystals, the columnar crystals at the two sides are mutually perpendicular, the grain boundary width of the original beta crystal grains at the two sides is smaller than 20 mu m, the cluster width of the secondary alpha is smaller than 70 mu m, the strips between clusters have large orientation difference, and the width of the secondary alpha lamellar is smaller than 5 mu m. The titanium alloy of the invention improves the work absorption per unit volume and reduces the adiabatic shear sensitivity.

Description

Gradient titanium alloy with low adiabatic shear sensitivity and preparation method thereof
Technical Field
The invention relates to a gradient titanium alloy with low adiabatic shear sensitivity and a preparation method thereof, and in particular belongs to the field of high-speed impact resistant materials and preparation thereof.
Background
The common types of the titanium alloy at the present stage comprise titanium alloy TC4 materials, the composition of which is Ti-6Al-4V, belongs to (alpha+beta) titanium alloy, and has good comprehensive mechanical properties, but the titanium alloy TC4 materials are generally processed, are not cheap in price, and have the characteristics of high strength, good corrosion resistance, high heat resistance and the like. In addition, the TA15 alloy also belongs to a common high-temperature titanium alloy, has a chemical composition of Ti-6.5Al-1Mo-1V-2Zr, has room temperature mechanical properties slightly higher than TC4 alloy and medium high-temperature mechanical properties, and is mainly used for aerospace structural parts and engine parts. At present, titanium alloy is often required to have low density and high dynamic strength, and can be applied to important structural materials in the field of high-speed impact resistance such as armor and the like. However, under high-speed impact conditions, titanium alloys deform at high strain rates in very short times (e.g., within tens of microseconds), and because of their low thermal conductivity, heat is not dissipated, and adiabatic temperature rise of several hundred degrees occurs in titanium alloys, shear localization is likely to occur, adiabatic shear zones are formed, and adiabatic shear failure occurs. Therefore, on the premise of ensuring dynamic strength, the titanium alloy with low adiabatic shear sensitivity has better application prospect in the field of high-speed impact resistance. Several researchers and scientists have studied the adiabatic shear sensitivity of titanium alloys.
CN104018106a discloses a rapid heat treatment method for reducing the adiabatic shear sensitivity of hot rolled TC4 titanium alloy. The specific process comprises the following steps: taking materials from a hot rolled binary structure TC4 titanium alloy plate, putting the materials into spark plasma sintering (Spark Plasma Sintering, SPS) equipment (SPS-3.20-MV type) for heat treatment, wherein the critical fracture strain value of the treated materials is improved by more than 53% compared with that of the original hot rolled plate under the dynamic loading condition, and the energy value absorbed by the materials per unit volume is improved by more than 54% before the materials are subjected to adiabatic shear failure. The advantages are that: the heat treatment is realized by utilizing the pulse energy, the discharge pulse pressure and the instant high-temperature field generated by Joule heat, has the characteristics of high temperature rising speed, short heat treatment time and the like, is a low-cost and high-efficiency heat treatment process capable of remarkably improving the plastic deformation capacity of a metal material, and provides a new process method for the microstructure regulation of the future titanium alloy.
CN113249667a discloses a heat treatment method for obtaining a high-toughness high-damage-tolerance dual-phase titanium alloy, comprising: the high-temperature annealing treatment comprises the following steps: at the temperature of T1, the heat preservation is carried out for 0.1-2 hours, the cooling speed needs to be reasonably controlled, and preferably, the temperature range from T1 to Tbeta-200 ℃ is controlled to be 2-50 ℃/s, wherein the value range of T1 is between Tbeta-10 ℃ and Tbeta, and Tbeta is the beta transformation temperature of the dual-phase titanium alloy. The method realizes the improvement of the toughness and damage tolerance performance of the dual-phase titanium alloy by controlling the heat treatment temperature and the cooling speed. The method can be used for the dual-phase titanium alloy with two structures at room temperature such as TC11, TA15, TC4, TC17, TC18 and the like, is not limited by the original manufacturing process of the titanium alloy, and is applicable to the dual-phase titanium alloy forging, castings, welding parts and additive manufacturing parts.
CN111763850a discloses a method for processing thick plates in fine-grain superplastic TA15 titanium alloy, which comprises the following steps: 1. obtaining a TA15 titanium alloy cast ingot through vacuum consumable arc melting; 2. after heat preservation, forging by upsetting and pulling out a cogged ingot to obtain a primary forging stock; 3. forging by upsetting and drawing through a beta-phase region after heat preservation to obtain a secondary forging stock; 4. upsetting and forging through an alpha+beta two-phase region to obtain a four-stage forging stock; 5. forging by upsetting and drawing final forging to obtain a forging piece; 6. heat preservation and rolling with one fire to obtain a rolled plate blank with one fire; 7. performing two-fire rolling after heat preservation to obtain a two-fire rolling plate blank; 8. and annealing to obtain the TA15 titanium alloy medium plate. According to the invention, the corresponding deformation temperature is selected, and upsetting forging with multiple fires and large deformation is adopted, so that the TA15 titanium alloy cast ingot with coarse structure is crushed under the large deformation, driving force is provided for recrystallization, the grain refinement and homogenization degree are improved, and the fine-grain superplastic TA15 titanium alloy medium plate is obtained.
Although some researches on morphological properties of high-temperature titanium alloy exist in the prior art, a series of defects and problems still exist, such as insufficient elimination of shear deformation sensitivity caused by high-speed impact, and limited improvement of impact resistance of titanium alloy sections. It is therefore desirable to provide a titanium alloy that is effective in reducing adiabatic shear sensitivity and a method of making the same.
Disclosure of Invention
In order to reduce the adiabatic shear sensitivity of titanium alloy used in the high-speed impact resistant field, the invention aims to provide a gradient titanium alloy with low adiabatic shear sensitivity and a preparation method thereof. More specifically, titanium alloys prepared using the method described herein may be expected to yield greater than 400J/cm 3 Is capable of absorbing work per unit volume.
The inventors of the present invention have studied and found that the adiabatic shear zone is deflected and terminated by the influence of a large-scale interface such as a grain boundary during expansion, and thus have devised grain boundaries, component interfaces, etc. in a material to obtain a titanium alloy having low adiabatic shear sensitivity. However, the studies disclosed in the prior art have difficulty in achieving control of grain boundaries, phase boundaries, and compositional interfaces within the material. The inventor discovers that a well-defined component interface is formed in the titanium alloy structure obtained by the research of the invention, and the grain orientations at two sides of the component interface are different and have high orientation. The component interface is a high-density grain staggered area, namely the component interface realizes a strengthening effect, has an effective limiting effect on shearing deformation generated by impact on the titanium alloy at high temperature, and can limit large-area deformation of original grains, thereby reducing the adiabatic shearing sensitivity of the titanium alloy material. Preferably, the component interfaces are in the form of distinct bands having a thickness of 1-5 μm, and interface thicknesses in this range minimize the adiabatic shear sensitivity of the titanium alloy.
In the process, the gradient titanium alloy with component interfaces and mutually perpendicular arrangement of original beta grain boundaries at two sides of the interfaces is obtained by a 3D printing process method, so that the absorption work of the unit volume of the titanium alloy is successfully improved, and the adiabatic shear sensitivity of the titanium alloy is reduced. Meanwhile, the process method of the invention has the advantage of low preparation cost.
In particular, a first aspect of the present invention provides a gradient titanium alloy of low adiabatic shear sensitivity, the titanium alloy being plate-like; the thickness of the titanium alloy is 10 mm-50 mm, the plane size is 7 cm-50 cm, and the parallelism is 0.02-0.1; the titanium alloy structure has obvious component interfaces, and the components on two sides are different; the microstructure of the titanium alloy is characterized in that the two sides of the interface are both widmannstatten structures, the original beta grains at the two sides are columnar widmannstatten structure crystals, the columnar crystals at the two sides are mutually perpendicular, the grain boundary width of the original beta grains at the two sides is smaller than 20 mu m, the cluster width of secondary alpha is smaller than 70 mu m, the strips between clusters have large orientation difference, and the width of the secondary alpha lamellar is smaller than 5 mu m.
In a preferred embodiment, the component interface of the gradient titanium alloy has a distinct band shape and a thickness of 1 to 5 μm.
In a preferred embodiment, the gradient titanium alloy contains at least two titanium alloy phases having different structures on both sides of the component interface.
In a preferred embodiment, both sides of the component interface of the gradient titanium alloy contain TC4 and TA15 titanium alloy phases, respectively.
In addition, the second aspect of the invention provides a preparation method of the gradient titanium alloy with low adiabatic shear sensitivity, which is prepared by the following steps:
(1) Using 3D printing equipment for powder feeding, taking high-purity argon gas as a carrier, conveying TA15 powder with the particle size of 90-270 meshes at the speed of 3-5 g/min, scanning with the laser power of 1200-1800 w, the scanning speed of 8-12 mm/s, the scanning channel interval of 1-2 mm, printing and preparing a titanium alloy block with the bottom surface of 5-25 mm multiplied by 70-500 mm and the height of 70-500 mm, and cooling in an air cooling mode;
(2) Leveling the block in the step (1), printing TC4 powder with the grain size of 90-270 meshes on the block in the same process by taking the direction of 5-25 mm as the height direction, and obtaining a titanium alloy plate with the bottom surface of 70-500 mm, 70-500 mm and the height of 10-50 mm by adopting the same process, wherein the printing height is 5-25 mm, and the cooling mode is air cooling;
(3) And (3) annealing the titanium alloy plate in the step (2), wherein the temperature is 850-1000 ℃, the heat preservation time is 1-1.5 h, and the cooling mode is air cooling.
Further, a third aspect of the invention provides the use of a gradient titanium alloy of low adiabatic shear sensitivity.
In a preferred embodiment, the gradient titanium alloy sheet material prepared by the method is wire cut and turned to obtain a sheet material with specified size and parallelism.
Advantageous effects
(1) The gradient component titanium alloy plate with obvious component interfaces and original beta grain boundaries on two sides of the interfaces which are mutually vertically arranged is prepared by adopting a 3D printing method. Therefore, the preparation method of the titanium alloy plate solves the problem that the conventional preparation method can not lead the grain boundaries in the titanium alloy to be arranged in a controlled way, and has lower cost and higher practical value.
(2) The gradient titanium alloy with low adiabatic shear sensitivity controls the arrangement direction of grain boundaries at two sides of a component interface, and uniform Wittig tissue is obtained through subsequent heat treatment, wherein the size of a secondary alpha phase is obviously thinned compared with that of a cast tissue, the thickness of a secondary alpha layer sheet is smaller than 5 mu m, the thickness of a secondary alpha cluster is smaller than 70 mu m, the dynamic strength of the titanium alloy with the tissue is improved, the tissue deformation coordination is enhanced, an adiabatic shear zone is influenced by the component interface and original beta grain boundaries which are vertically arranged between the component interface and the original beta grain boundaries to deflect or even terminate in the expansion process, the adiabatic shear sensitivity of the material is reduced, and the protection performance of the material against high-speed impact damage is improved.
(3) Meanwhile, the interface of the two-phase structure components of the gradient titanium alloy with low adiabatic shear sensitivity is a strip-shaped structure dense region with specific thickness, has an effective limiting effect on shear deformation generated by impact on the titanium alloy at high temperature, and can limit large-area deformation of original grains, so that the adiabatic shear sensitivity of the titanium alloy material is reduced. The experiment of the invention shows that the low adiabatic shear sensitivity gradient titanium alloy plate with the composition of composite phase TC4-TA15 can achieve 400J/cm of absorption power per unit volume under the strain rate of 3000/s 3 Compared with the traditional TC4 and TA15 titanium alloy, the titanium alloy is improved by more than 50 percent.
Drawings
FIG. 1 is a schematic diagram of the internal interface distribution of a low adiabatic shear sensitivity gradient titanium alloy material prepared in example 1.
FIG. 2 is an electron microscope image of the internal interface distribution of the prepared low adiabatic shear sensitivity gradient titanium alloy material.
Detailed Description
The following specific examples are given to illustrate the present invention without limiting it thereto.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar modules or modules having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present specification, reference to the term "one embodiment," "another embodiment," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
TA15 titanium alloy
The nominal composition of the TA15 titanium alloy is Ti-6.5Al-2Zr-1Mo-1V. The main strengthening mechanism is solid solution strengthening through an alpha stabilizing element AI. The addition of neutral elements Zr and beta stabilizing elements Mo and V can improve manufacturability. The alloy has AI equivalent of 6.58%, mo equivalent of 2.46% and belongs to near alpha type titanium alloy with high AI equivalent, so that the alloy has excellent heat resistance and weldability of alpha type titanium alloy and technological plasticity close to alpha-beta type titanium alloy. The TA15 alloy has moderate room temperature and high temperature strength, good heat stability and welding performance, and the process plasticity is slightly lower than TC4.
TC4
The composition of the titanium alloy TC4 material is Ti-6Al-4V, belongs to (alpha+beta) titanium alloy, and has good comprehensive mechanical properties. The specific strength is high. TC4 has a strength sb=1.012 GPa and a density g=4.51 g/cm 3 Specific strength sb/g=23.5, whereas the specific strength sb/g of the alloy steel is less than 18. Titanium alloys have low thermal conductivity. The thermal conductivity of the titanium alloy is 1/5 of that of iron, 1/10 of that of aluminum, and the thermal conductivity of TC4 is 7.955W/mK.
SHPB experiment
Also known as a split hopkinson pressure bar (Split Hopkinson Pressure Bar, SHPB) high temperature impact test. The experimental device uses a WDW-300 type material testing machine and a Hopkinson pressure bar experimental device with a separation of phi 14.5 mm. According to the experiment, the brass shims are additionally arranged at the impact end of the incident rod to carry out waveform shaping so as to realize constant strain rate loading, and the ultra-dynamic signal test analysis system is used for collecting strain data and absorption work data per unit volume under the limit condition. In addition, high-strength steel cushion blocks are additionally arranged at two ends of the test piece to prevent the end face of the rod from being damaged, and the plastic shell is used for covering the whole test piece to recover fragments after reaction.
The aspects of specific embodiments of the present invention are further illustrated below.
Example 1
The invention relates to a preparation method of a gradient titanium alloy with low adiabatic shear sensitivity, which comprises the following steps:
(1) Using 3D printing equipment for powder feeding, taking high-purity argon as a carrier, conveying TA15 powder with the particle size of 140 meshes at the speed of 4g/min, scanning with the laser power of 1500w, wherein the scanning speed is 10mm/s, the interval between scanning channels is 1.5mm, printing and preparing titanium alloy blocks with the bottom surface of 10mm multiplied by 200mm and the height of 200mm, and cooling in an air cooling mode;
(2) Leveling the block in the step (1), printing TC4 powder with the grain diameter of 90 meshes on the block in the same process by taking the direction of 10mm as the height direction, and printing the TC4 powder with the height of 10mm to obtain a titanium alloy plate with the bottom surface of 200mm and the height of 20mm, wherein the cooling mode is air cooling;
(3) And (3) annealing the titanium alloy plate in the step (2), wherein the temperature is 930 ℃, the heat preservation time is 1h, and the cooling mode is air cooling.
The gradient titanium alloy plate prepared by the method is subjected to wire cutting and turning milling, so that the plate with specified size and parallelism is obtained, the display structure of the plate has obvious component interfaces, the widmannstatten structures are arranged on two sides of the interfaces, the original beta grains on two sides are columnar widmannstatten structure crystals, the columnar crystals on two sides are mutually perpendicular, the grain boundary width of the original beta grains on two sides is smaller than 20 mu m, the cluster width of secondary alpha is smaller than 70 mu m, the strip between clusters has large orientation difference, and the width of the secondary alpha sheet is smaller than 5 mu m.
Under the condition of 3000/s strain rate by SHPB experiment, the absorption work per unit volume of the titanium alloy plate obtained by the embodiment is 410J/cm 3 。
The metallographic electron microscopic image of the gradient titanium alloy with low adiabatic shear sensitivity obtained in the embodiment 1 of the invention is shown in figure 1. It can be seen that the grains are oriented differently on both sides of the component interface, and the growth ends at the component interface. The band-like region is formed by the component interface. FIG. 2 is a schematic diagram more vividly depicting the unique structure of the gradient titanium alloy of the present invention that results in low adiabatic shear sensitivity.
Example 2
The invention relates to a preparation method of a gradient titanium alloy with low adiabatic shear sensitivity, which comprises the following steps:
(1) Using 3D printing equipment for powder feeding, taking high-purity argon as a carrier, conveying TA15 powder with the particle size of 160 meshes at the speed of 5g/min, scanning with the laser power of 1500w, wherein the scanning speed is 12mm/s, the interval between scanning channels is 2mm, printing and preparing titanium alloy blocks with the bottom surface of 15mm multiplied by 200mm and the height of 200mm, and cooling in an air cooling mode;
(2) Leveling the block in the step (1), printing TC4 powder with the grain diameter of 140 meshes on the block in the same process by taking the direction of 15mm as the height direction, and printing the TC4 powder with the height of 15mm to obtain a titanium alloy plate with the bottom surface of 200mm and the height of 30mm, wherein the cooling mode is air cooling;
(3) And (3) annealing the titanium alloy plate in the step (2), wherein the temperature is 960 ℃, the heat preservation time is 1.5h, and the cooling mode is air cooling.
The gradient titanium alloy plate prepared by the method is subjected to wire cutting and turning milling, so that the plate with specified size and parallelism is obtained, the display structure of the plate has obvious component interfaces, the widmannstatten structures are arranged on two sides of the interfaces, the original beta grains on two sides are columnar widmannstatten structure crystals, the columnar crystals on two sides are mutually perpendicular, the grain boundary width of the original beta grains on two sides is smaller than 20 mu m, the cluster width of secondary alpha is smaller than 70 mu m, the strip between clusters has large orientation difference, and the width of the secondary alpha sheet is smaller than 5 mu m.
Under the condition of 3000/s strain rate by SHPB experiment, the absorption work per unit volume of the titanium alloy plate obtained by the embodiment is 400J/cm 3 。
Example 3
The invention relates to a preparation method of a gradient titanium alloy with low adiabatic shear sensitivity, which comprises the following steps:
(1) Using 3D printing equipment for powder feeding, taking high-purity argon as a carrier, conveying TA15 powder with the grain diameter of 90 meshes at the speed of 3g/min, scanning with the laser power of 1700w, wherein the scanning speed is 10mm/s, the interval between scanning channels is 1mm, printing and preparing titanium alloy blocks with the bottom surface of 10mm multiplied by 200mm and the height of 200mm, and cooling in an air cooling mode;
(2) Leveling the block in the step (1), printing TC4 powder with the grain diameter of 140 meshes on the block in the same process by taking the direction of 10mm as the height direction, and printing the TC4 powder with the height of 10mm to obtain a titanium alloy plate with the bottom surface of 200mm and the height of 20mm, wherein the cooling mode is air cooling;
(3) And (3) annealing the titanium alloy plate in the step (2), wherein the temperature is 1000 ℃, the heat preservation time is 1h, and the cooling mode is air cooling.
The gradient titanium alloy plate prepared by the method is subjected to wire cutting and turning milling, so that the plate with specified size and parallelism is obtained, the display structure of the plate has obvious component interfaces, the widmannstatten structures are arranged on two sides of the interfaces, the original beta grains on two sides are columnar widmannstatten structure crystals, the columnar crystals on two sides are mutually perpendicular, the grain boundary width of the original beta grains on two sides is smaller than 20 mu m, the cluster width of secondary alpha is smaller than 70 mu m, the strip between clusters has large orientation difference, and the width of the secondary alpha sheet is smaller than 5 mu m.
Under the condition of 3000/s strain rate by SHPB experiment, the absorption work per unit volume of the titanium alloy plate obtained by the embodiment is 420J/cm 3 。
Comparative example 1 (CN 104018106 a)
The closest sample of example 1 of prior art CN104018106A was taken as comparative example 1, which yielded a work of absorption per unit volume of 248J/cm 3 。
Thus, compared with the technical proposal of the comparative example, the embodiment of the invention obtains the gradient titanium alloy with low adiabatic shear sensitivity, and the absorption work per unit volume of the titanium alloy plate obtained by the embodiment is more than 420J/cm under the condition of the strain rate of 3000/s 3 While the absorption work per unit volume of the sample of the comparative example is not more than 250J/cm 3 . The low adiabatic shear sensitivity gradient titanium alloy obtained by the technical scheme of the invention has obviously improved impact resistance.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (6)

1. A low adiabatic shear sensitivity gradient titanium alloy characterized by: the titanium alloy is plate-shaped; the thickness of the titanium alloy is 10 mm-50 mm, the plane size is 7 cm-50 cm, and the parallelism is 0.02-0.1; the titanium alloy has obvious component interfaces, and the components on two sides are different; the microstructure of the titanium alloy is characterized in that the two sides of the interface are Wittig structures, the original beta crystal grains at the two sides are columnar crystals, the columnar crystals at the two sides are mutually perpendicular, the grain boundary width of the original beta crystal grains at the two sides is smaller than 20 mu m, the cluster width of the secondary alpha is smaller than 70 mu m, the strips between clusters have large orientation difference, and the width of the secondary alpha lamellar is smaller than 5 mu m.
2. The gradient titanium alloy according to claim 1, wherein the component interface of the gradient titanium alloy has a distinct band shape with a thickness of 1-5 μm.
3. The gradient titanium alloy of claim 1 having an work absorption per unit volume greater than 400J/cm 3 。
4. A method of preparing a low adiabatic shear sensitivity gradient titanium alloy as claimed in claim 1 or 2, wherein:
(1) Using 3D printing equipment for powder feeding, taking high-purity argon gas as a carrier, conveying TA15 powder with the grain size of 90-270 meshes at the speed of 3-5 g/min, scanning with the laser power of 1200-1800 w, printing and preparing a titanium alloy block with the bottom surface of 5-25 mm multiplied by 70-500 mm and the height of 70-500 mm, and cooling in an air cooling mode;
(2) Leveling the block in the step (1), printing TC4 powder with the grain size of 90-270 meshes on the block in the same process by taking the direction of 5-25 mm as the height direction, and obtaining a titanium alloy plate with the bottom surface of 70-500 mm, 70-500 mm and the height of 10-50 mm by adopting the same process, wherein the printing height is 5-25 mm, and the cooling mode is air cooling;
(3) And (3) annealing the titanium alloy plate in the step (2), wherein the temperature is 850-1000 ℃, the heat preservation time is 1-1.5 h, and the cooling mode is air cooling.
5. The method for preparing a gradient titanium alloy with low adiabatic shear sensitivity according to claim 4, wherein: the absorption work per unit volume of the prepared titanium alloy material is more than 400J/cm 3 。
6. The method for preparing a gradient titanium alloy with low adiabatic shear sensitivity according to claim 4, wherein: in the step (1), the scanning speed is 8-12 mm/s, and the scanning channel interval is 1-2 mm.
CN202210106019.9A 2022-01-28 2022-01-28 Gradient titanium alloy with low adiabatic shear sensitivity and preparation method thereof Active CN114472897B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210106019.9A CN114472897B (en) 2022-01-28 2022-01-28 Gradient titanium alloy with low adiabatic shear sensitivity and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210106019.9A CN114472897B (en) 2022-01-28 2022-01-28 Gradient titanium alloy with low adiabatic shear sensitivity and preparation method thereof

Publications (2)

Publication Number Publication Date
CN114472897A CN114472897A (en) 2022-05-13
CN114472897B true CN114472897B (en) 2023-06-06

Family

ID=81475721

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210106019.9A Active CN114472897B (en) 2022-01-28 2022-01-28 Gradient titanium alloy with low adiabatic shear sensitivity and preparation method thereof

Country Status (1)

Country Link
CN (1) CN114472897B (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101429637B (en) * 2008-12-02 2010-09-08 北京航空航天大学 Biphase titanium alloy thermal treatment method for acquiring two-state organization with raft-shape primary alpha phase
CN105088120B (en) * 2014-05-08 2017-02-15 中国科学院金属研究所 Widmannstatten structure titanium alloy with composite laminated structure and preparation method thereof
CN104018106B (en) * 2014-06-19 2016-05-11 北京理工大学 A kind of quick heat treatment method that reduces hot rolling TC4 titanium alloy Adiabatic Shearing Sensitivity
JP6696202B2 (en) * 2016-02-15 2020-05-20 日本製鉄株式会社 α + β type titanium alloy member and manufacturing method thereof
CN107649682A (en) * 2017-09-04 2018-02-02 西安交通大学 The method of ultrasonic impact and sensing heating refining laser increasing material manufacturing titanium alloy crystal grain
CN111763850B (en) * 2020-07-13 2021-05-07 西北有色金属研究院 Processing method of fine-grain superplasticity TA15 titanium alloy medium-thick plate
CN113275600B (en) * 2021-05-17 2022-06-07 北京科技大学 Heat treatment method for obtaining tri-state structure in SLM forming titanium alloy
CN113249667B (en) * 2021-06-18 2021-10-01 北京煜鼎增材制造研究院有限公司 Heat treatment method for obtaining high-toughness high-damage-tolerance dual-phase titanium alloy

Also Published As

Publication number Publication date
CN114472897A (en) 2022-05-13

Similar Documents

Publication Publication Date Title
CN103602840B (en) A kind of preparation method of titanium zirconium base alloy
CN110643853B (en) Preparation method of TiAl-Ni alloy plate with high strength, toughness and stability
JP6796157B2 (en) Manufacturing method for performance-enhanced metal materials
JP5685201B2 (en) Monolithic aluminum alloy target and method of manufacturing the same
CN111842488B (en) Process method for realizing TiAl alloy uniform fine grain structure based on cross sheath rolling
CN103343306A (en) Treatment method for obviously improving deformability and mechanical property of high-strength aluminum alloy
CN108817384B (en) Preparation method of core-shell structure particle reinforced aluminum matrix composite
Mulyukov et al. Production, properties and application prospects of bulk nanostructured materials
CN113564397B (en) Short-process preparation method of medium-strength high-toughness titanium alloy medium-thickness plate
Yang et al. Hot deformation behavior and microstructure evolution of the spray deposited and secondary hot extruded 2195 Al–Li alloy
CN113355613A (en) Production process for improving comprehensive performance of aluminum alloy plate
JP2004052111A (en) Superfine crystal grain copper sputtering target
CN114085969B (en) Preparation process of high-entropy alloy plate with heterogeneous laminated structure
CN109317679B (en) Production method of aluminum alloy sheet
CN114472897B (en) Gradient titanium alloy with low adiabatic shear sensitivity and preparation method thereof
CN105695910A (en) Superplastic forming method of TiAl-based alloy sheet
CN113416906B (en) Process for preparing titanium alloy bar blank by combining extrusion cogging and pulse current heat treatment
CN115466867B (en) TiAl alloy capable of improving uniform deformation capacity and preparation method thereof
CN108754371B (en) Preparation method of refined α -close high-temperature titanium alloy grains
Yong et al. Hot deformation behavior and related microstructure evolution in Au− Sn eutectic multilayers
CN109468492A (en) A kind of titanium alloy plate and its processing technology of high impact toughness
Dombrowski Manufacture of beryllium for fusion energy applications
Yamashita et al. Construction of processing map for biomedical Co-29Cr-6Mo-0.23 C-0.14 N alloy by using compression tests
CN114179457B (en) High-formability magnesium alloy double-layer composite board containing rare earth yttrium and preparation method thereof
Ni et al. Grain refinement process of pure iron target under hypervelocity impact

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant