CN114216763A - Method for evaluating laser selective melting forming performance of titanium alloy material - Google Patents
Method for evaluating laser selective melting forming performance of titanium alloy material Download PDFInfo
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- CN114216763A CN114216763A CN202111242049.4A CN202111242049A CN114216763A CN 114216763 A CN114216763 A CN 114216763A CN 202111242049 A CN202111242049 A CN 202111242049A CN 114216763 A CN114216763 A CN 114216763A
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- 238000002844 melting Methods 0.000 title claims abstract description 42
- 230000008018 melting Effects 0.000 title claims abstract description 42
- 239000000956 alloy Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000000171 quenching effect Effects 0.000 claims abstract description 21
- 238000010791 quenching Methods 0.000 claims abstract description 20
- 238000009864 tensile test Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 39
- 238000011156 evaluation Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 19
- 238000003723 Smelting Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 9
- 239000002826 coolant Substances 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000010891 electric arc Methods 0.000 claims description 4
- 238000010894 electron beam technology Methods 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000011534 incubation Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 238000005336 cracking Methods 0.000 description 10
- 238000007639 printing Methods 0.000 description 9
- 239000000843 powder Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 230000008021 deposition Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
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- 238000011161 development Methods 0.000 description 2
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- 239000007788 liquid Substances 0.000 description 2
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- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- 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]
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- 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
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- 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
Abstract
The invention discloses a method for evaluating selective laser melting forming performance of a titanium alloy material, and relates to the technical field of selective laser melting forming. The method comprises the following steps: step (1): preparing a titanium alloy ingot; step (2): quenching the titanium alloy ingot; and (3): and (3) taking a mechanical property tensile test bar, stretching the titanium alloy ingot treated in the step (2) at room temperature to obtain the elongation at room temperature, and comparing the elongation of the titanium alloy material in a quenching state to evaluate the formability. The method can identify the selective laser melting forming performance of the titanium alloy material, and has the advantages of low cost, short flow and high efficiency.
Description
Technical Field
The invention relates to the technical field of selective laser melting and forming, in particular to a method for evaluating selective laser melting and forming performance of a titanium alloy material.
Background
The titanium alloy is used as a light structural material with high strength, low density and high temperature resistance, and is widely applied to the manufacture of aerospace craft, aircraft engines and fuselage structure products. Therefore, the titanium alloy part formed by selective laser melting is one of the most widely applied products in the aerospace field at present. However, unlike high-temperature alloys, aluminum alloys, and stainless steels, titanium alloy materials have a greater tendency to stress cracking during selective laser melting, which is likely to cause failure in forming, i.e., poor formability. And the laser selective melting forming performance of the titanium alloy material is closely related to alloy components, for example, the cracking tendency of pure titanium forming is superior to that of TC4 titanium alloy, and TC4 is superior to that of TA15 titanium alloy. In order to meet the requirements of selective laser melting and forming of a product, when a titanium alloy material is selected, the forming performance of the titanium alloy material must be evaluated. However, the traditional forming performance evaluation method usually adopts a printing mode, the preparation period of raw material powder is long, the whole evaluation period is long, the efficiency is low, and the cost is high due to the problem of powder yield in the powder preparation process.
Disclosure of Invention
The invention aims to overcome the defects of long evaluation period, low efficiency, high cost and the like of the existing laser selective melting formability of the titanium alloy material, and provides a method for rapidly evaluating the laser selective melting formability of the titanium alloy material.
According to the technical scheme of the invention, the method for evaluating the selective laser melting forming performance of the titanium alloy material comprises the following steps:
step (1): preparing a titanium alloy ingot;
step (2): quenching the titanium alloy ingot;
and (3): and (3) taking a mechanical property tensile test bar, stretching the titanium alloy ingot treated in the step (2) at room temperature to obtain the elongation at room temperature, and comparing the elongation of the titanium alloy material in a quenching state to evaluate the formability.
Further, the step (1) specifically includes: and smelting the raw materials by using a vacuum smelting furnace for 2-5 times to obtain a titanium alloy ingot.
Further, the raw material in the step (1) comprises a raw material for preparing a titanium alloy.
Further, the vacuum melting furnace of step (1) includes, but is not limited to, a vacuum consumable electric arc furnace, a vacuum non-consumable electric arc furnace, a vacuum induction melting furnace, and a vacuum electron beam cold hearth furnace.
Further, the length, width and height of the titanium alloy ingot in the step (1) should be not less than 10mm × 10mm × 70 mm.
Further, the step (2) specifically includes: and (3) performing heat preservation treatment on the titanium alloy ingot for 20 min-2 h by using a muffle furnace, quickly taking out the titanium alloy ingot from the furnace after the heat preservation treatment, putting the titanium alloy ingot into a cooling medium, stirring the titanium alloy ingot, cooling the titanium alloy ingot to room temperature, and taking the titanium alloy ingot out.
Further, the temperature of the heat preservation treatment in the step (2) is Tβ～Tβ+120℃，TβIs the phase transition temperature of the titanium alloy material.
Further, the time from the removal from the furnace to the immersion in the cooling medium in said step (2) should not exceed 10 s.
Further, the cooling medium in the step (2) includes, but is not limited to, pure water, brine, liquid nitrogen, quenching oil, and the like.
Further, the mechanical property test bar in the step (3) is a bar-mounted sample with the size specified in GB/T228.1.
Further, the mechanical property test in the step (3) is carried out according to GB/T228.1, and the test strain rate should not exceed 0.08min-1。
Further, the evaluation criteria of the elongation in the step (3) are as follows: if the elongation of the material is more than 5%, the selective laser melting and forming performance of the material is relatively good; if the elongation of the material is less than 5%, the formability of the material is poor and the forming risk is high.
The invention has the beneficial effects that:
compared with the existing titanium alloy material selective laser melting forming performance evaluation technology, the invention has the following advantages: aiming at titanium alloy materials, the traditional evaluation method adopts multiple processes of smelting, forging, bar machining, powder making and printing, so that the evaluation period is long, the efficiency is low, the cost is high, and the development of the titanium alloy materials suitable for selective laser melting is not facilitated. The invention evaluates the laser selective melting forming performance of the cast product by testing the room temperature elongation of the quenched beta-phase region, and has the advantages of extremely short period, high efficiency and low cost. The invention can quickly evaluate the forming performance of the novel titanium alloy material, thereby effectively reducing the development cycle of the new titanium alloy material formed by selective laser melting.
Drawings
FIG. 1 is a flow diagram of a method according to an embodiment of the invention;
FIG. 2 shows the test bar printing effect of the TC4 titanium alloy material in the example;
FIG. 3 shows the printing effect of the test bar of TA15 titanium alloy material in the example;
FIG. 4 shows the test bar printing effect of the TC31 titanium alloy material in the example.
Detailed Description
The present invention is described in detail below with reference to the following examples, which are necessary to point out here only for further illustration of the present invention and should not be construed as limiting the scope of the present invention, and those skilled in the art can make some insubstantial modifications and adaptations to the present invention based on the above-mentioned disclosure.
The following description of embodiments of the invention is given by way of example and accompanying drawings.
When the selective laser melting forming is carried out, the cracking of the product is caused by the fact that the thermal stress generated by rapid cooling exceeds the yield strength of the product, and the deformation exceeds the elongation of the material. Thus, when the plasticity of the material of the article is sufficiently high, i.e., when residual stresses are applied, cracking is inhibited by the plastic deformation coordination. For titanium alloy, the mechanical property of the titanium alloy shows the phenomena of strength reduction and plasticity increase along with the increase of temperature, namely, the plasticity is higher at higher temperature. In the selective laser melting deposition process, the temperature of the workpiece ranges from room temperature to above the melting point in the repeated heating and cooling processes, so that the plasticity of the workpiece at room temperature is the core reason for determining whether the workpiece cracks in the forming process.
The cooling speed in the selective laser melting and forming process is extremely high, and the quenching effect can be achieved, so that the deposited microstructure after selective laser melting and forming of the titanium alloy is in a quenched martensite state. The microstructure of the alloy is consistent with the microstructure of the quenched alloy, and the mechanical property of the alloy is mainly influenced by the microstructure, so that the quenched state property with similar structure state can be selected to represent the deposition state property of the same titanium alloy component.
In summary, room temperature plasticity of the titanium alloy in the deposition state of the laser selective melting formed part is a key index for reflecting whether the forming is cracked or not (namely, formability). The deposited microstructure is consistent with the quenched microstructure and is a quenched martensite microstructure, so that room temperature plasticity of the same titanium alloy material casting or forging after quenching can be selected to represent the formability of the titanium alloy material.
As shown in fig. 1, the method for evaluating the selective laser melting forming performance of the titanium alloy material provided by the technical scheme of the invention comprises the following steps:
a step (101): preparation of ingot
And smelting the raw materials by using a vacuum smelting furnace for 2-5 times to obtain a titanium alloy ingot. The raw materials include those for making titanium alloys. Vacuum melting furnaces include, but are not limited to, vacuum consumable arc furnaces, vacuum non-consumable arc furnaces, vacuum induction melting furnaces, vacuum electron beam cold hearth furnaces. The length, width and height of the titanium alloy ingot should be not less than 10mm multiplied by 70 mm.
A step (102): quenching treatment
And (4) carrying out heat preservation treatment on the titanium alloy ingot obtained in the step (101) for 20 min-2 h by using a muffle furnace, quickly taking out the titanium alloy ingot from the furnace after treatment, putting the titanium alloy ingot into a cooling medium, stirring, cooling to room temperature, and taking out the titanium alloy ingot.
The heat preservation treatment temperature is Tβ～Tβ+120℃，TβIs the phase transition temperature of the titanium alloy material. The time from removal from the furnace to immersion in the cooling medium should not exceed 10 s. The cooling medium includesBut are not limited to pure water, saline water, liquid nitrogen, quenching oil, and the like.
Step (103): mechanical property test and forming property evaluation
And (4) taking a mechanical property tensile test bar from the titanium alloy ingot treated in the step (102), and stretching at room temperature to obtain the elongation at room temperature. Then comparing the elongation of the titanium alloy material in a quenching state, and evaluating the formability; the evaluation criteria for elongation were: if the elongation of the material is more than 5%, the selective laser melting and forming performance of the material is relatively good; if the elongation of the material is less than 5%, the formability of the material is poor and the forming risk is high.
Through the determination of multi-batch mechanical tests, the room-temperature tensile elongation of the TA15 titanium alloy selective laser melting-forming deposition-state test bar is between 5% and 7%, and the room-temperature tensile elongation of the TC4 titanium alloy selective laser melting-forming deposition-state test bar is within the range of 8% to 12%. And the TC31 titanium alloy laser selective melting forming deposition test bar with cracks at the root of the test part has the room temperature tensile elongation below 4 percent and even has brittle fracture. This indicates that the room temperature tensile elongation of more than 5% can inhibit the thermal stress cracking behavior in the forming process; when the content is less than 5%, the deformation caused by the stress during the forming process exceeds the plasticity of the material, resulting in cracking of the article during the forming process.
The mechanical property test bar is a bar-mounted test sample with the size specified in GB/T228.1; the mechanical property test is carried out according to GB/T228.1, and the test strain rate should not exceed 0.08min-1。
Example 1
S1, ingot preparation:
according to the requirements of Ti-6 (wt.%) Al-4 (wt.%) V (TC4) titanium alloy components, twice smelting is carried out by using vacuum consumable arc smelting equipment to prepare a TC4 titanium alloy ingot, and the phase transformation point of the TC4 titanium alloy ingot is 965 +/-5 ℃ through a quenching metallographic method.
S2, quenching treatment
From the ingot obtained in step S1, 3 bar-like samples having a size of Φ 15mm by 90mm were taken. And (3) preserving the temperature of the sample in a muffle furnace at 980 ℃ for 30min, then quickly taking out the sample from the furnace, putting the sample into water, stirring and quenching the sample, wherein the time from the discharge to the water inlet is 4s, and the time from the water inlet to the stirring is 1 min.
S3, mechanical property test and forming property evaluation
Machining the test bar obtained in the step S2 into an M10 multiplied by phi 5 test bar, testing the room-temperature tensile property according to GB/T228.1, wherein the strain rate is 0.08min-1The test results are shown in Table 1. The elongation is over 8.5 percent and is more than 5 percent, which shows that the TC4 titanium alloy has excellent laser selective melting forming performance. The actual printing condition of the powder is shown in figure 2, the cracking behavior of the formed whole substrate product does not occur, and the excellent selective laser melting forming performance of the material is proved.
TABLE 1
| Sample number | TC4-1 | TC4-2 | TC4-3 |
| Elongation (%) | 9 | 9.5 | 8.5 |
Example 2
S1, ingot preparation:
according to the requirements of Ti-6.5 (wt.%) Al-1 (wt.%) Mo-1 (wt.%) V-2 (wt.%) Zr (TA15) titanium alloy components, twice smelting is carried out by using vacuum consumable arc smelting equipment to prepare a TA15 titanium alloy ingot, and the transformation point of the TA15 titanium alloy ingot is 975 +/-5 ℃ as determined by a quenching metallographic method.
S2, quenching treatment
From the ingot obtained in step S1, 3 bar-like samples having a size of Φ 15mm by 90mm were taken. And (3) preserving the temperature of the sample in a muffle furnace at 1000 ℃ for 30min, then quickly taking out the sample from the furnace, putting the sample into water, stirring and quenching the sample, wherein the time from the discharge to the entry of the water is 5s, and the time from the entry of the water to the stirring is 1 min.
S3, mechanical property test and forming property evaluation
Machining the test bar obtained in the step S2 into an M10 multiplied by phi 5 test bar, testing the room-temperature tensile property according to GB/T228.1, wherein the strain rate is 0.08min-1The test results are shown in Table 2. The elongation is more than 6 percent and more than 5 percent, which shows that the TC4 titanium alloy has excellent laser selective melting forming performance. The actual printing condition of the powder is shown in figure 3, the cracking behavior of the test bars in the forming batch does not occur, and the selective laser melting forming performance of the material is proved to be good.
TABLE 2
| Sample number | TA15-1 | TA15-2 | TA15-3 |
| Elongation (%) | 6.5 | 6 | 6.5 |
Example 3
S1, ingot preparation:
according to the requirements of Ti-6.5 (wt.%) Al-3 (wt.%) Sn-3 (wt.%) Zr-3 (wt.%) Nb-3 (wt.%) Mo-1 (wt.%) W-0.2 (wt.%) Si (TC31) titanium alloy components, twice smelting is carried out by using a vacuum consumable arc smelting device to prepare a TA15 titanium alloy cast ingot, and the transformation point of the TA15 titanium alloy cast ingot is 995 +/-5 ℃ through a quenching metallographic method.
S2, quenching treatment
From the ingot obtained in step S1, 3 bar-like samples having a size of Φ 15mm by 90mm were taken. And (3) preserving the temperature of the sample in a muffle furnace at 1020 ℃ for 30min, then quickly taking out the sample from the furnace, putting the sample into water, stirring and quenching the sample, wherein the time from the discharge to the water inlet is 4s, and the time from the water inlet to the stirring is 1 min.
S3, mechanical property test and forming property evaluation
Machining the test bar obtained in the step S2 into an M10 multiplied by phi 5 test bar, testing the room-temperature tensile property according to GB/T228.1, wherein the strain rate is 0.08min-1The test results are shown in Table 3. The elongation is below 3.56% and less than 5%, which shows that the TC31 titanium alloy has poor selective laser melting forming performance and high printing cracking tendency. The actual printing condition of the powder is shown in figure 4, when the test bar is formed, most of the test bar has obvious cracking behavior, and the laser selective melting forming performance of the material is proved to be poor.
TABLE 3
| Sample number | TC31-1 | TC31-2 | TC31-3 |
| Elongation (%) | 3 | 3.5 | 2.5 |
While embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments, which are intended to be illustrative rather than limiting, and many modifications may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for evaluating the selective laser melting and forming performance of a titanium alloy material is characterized by comprising the following steps:
step (1): preparing a titanium alloy ingot;
step (2): quenching the titanium alloy ingot;
and (3): and (3) taking a mechanical property tensile test bar, stretching the titanium alloy ingot treated in the step (2) at room temperature to obtain the elongation at room temperature, and comparing the elongation of the titanium alloy material in a quenching state to evaluate the formability.
2. The evaluation method according to claim 1, wherein the step (1) specifically comprises: and smelting the raw materials by using a vacuum smelting furnace for 2-5 times to obtain a titanium alloy ingot.
3. The evaluation method according to claim 2, wherein the vacuum melting furnace of step (1) includes, but is not limited to, a vacuum consumable electric arc furnace, a vacuum non-consumable electric arc furnace, a vacuum induction melting furnace, a vacuum electron beam cold hearth furnace.
4. The evaluation method according to claim 2, wherein the length, width and height of the titanium alloy ingot in the step (1) are not less than 10mm x 70 mm.
5. The evaluation method according to claim 1, wherein the step (2) specifically comprises: and (3) performing heat preservation treatment on the titanium alloy ingot for 20 min-2 h by using a muffle furnace, quickly taking out the titanium alloy ingot from the furnace after the heat preservation treatment, putting the titanium alloy ingot into a cooling medium, stirring the titanium alloy ingot, cooling the titanium alloy ingot to room temperature, and taking the titanium alloy ingot out.
6. The evaluation method according to claim 5, wherein the incubation temperature in the step (2) is Tβ～Tβ+120℃，TβIs the phase transition temperature of the titanium alloy material.
7. The evaluation method according to claim 5, wherein the time from the removal from the furnace to the immersion in the cooling medium in the step (2) is not more than 10 s.
8. The method according to claim 1, wherein the mechanical property test bar in the step (3) is a bar-shaped test specimen having a size specified in GB/T228.1.
9. The evaluation method according to claim 8, wherein the mechanical property test in the step (3) is performed in accordance with GB/T228.1, and the test strain rate is not more than 0.08min-1。
10. The evaluation method according to claim 1, wherein the evaluation criterion of the elongation in the step (3) is: if the elongation of the material is more than 5%, the selective laser melting and forming performance of the material is relatively good; if the elongation of the material is less than 5%, the formability of the material is poor and the forming risk is high.
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|---|---|---|---|---|
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| CN107414078A (en) * | 2017-08-17 | 2017-12-01 | 湖南顶立科技有限公司 | Melt increasing material manufacturing technique in a kind of TC4 titanium alloys selective laser |
| CN110681863A (en) * | 2019-10-23 | 2020-01-14 | 飞而康快速制造科技有限责任公司 | Titanium alloy part with uniform transverse and longitudinal properties and preparation method thereof |
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