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A kind of heat treatment method to obtain three-state structure in slm forming titanium alloy

A heat treatment furnace, β titanium alloy technology, applied in the improvement of process efficiency, additive manufacturing, additive processing, etc., can solve the problems of excellent three-state structure, failure to obtain mechanical properties of titanium alloy, etc., to improve the strength-plasticity mismatch Effect

Active Publication Date: 2022-06-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the heat treatment method mentioned above has improved the strength-plasticity matching, it has not obtained the three-state structure that leads to the excellent mechanical properties of titanium alloys.

Method used

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  • A kind of heat treatment method to obtain three-state structure in slm forming titanium alloy
  • A kind of heat treatment method to obtain three-state structure in slm forming titanium alloy
  • A kind of heat treatment method to obtain three-state structure in slm forming titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Taking TA15 (Ti-6Al-2Zr-1Mo-1V) powder particles with an average particle size of 43.6μm and the composition as shown in the attached table of parameters as the forming raw material, according to the process parameters shown in the attached table of parameters, a rod with a size of Φ12mmⅹ83mm is formed. material.

[0031] Parameter Schedule 1

[0032]

[0033] Parameter Schedule II

[0034]

[0035] Use laser selective melting equipment to print TA15 titanium alloy powder (phase transition temperature 995°C), and print it into a bar of Φ12mmⅹ83mm. The bar stock is separated from the substrate by wire cutting, and then the bar stock is placed in a vacuum heat treatment furnace for heat treatment.

[0036] First, heat the bar to 970°C for 1.5h at a heating rate of 10°C / min, turn off the heating program, and cool down to room temperature with the furnace; then heat the once heat-treated bar to 930°C for 2h at the same heating rate, and take it out. The samples wer...

Embodiment 2

[0039] Taking TA15 (Ti-6Al-2Zr-1Mo-1V) powder particles with an average particle size of 43.6μm and the composition as shown in the attached table of parameters as the forming raw material, according to the process parameters shown in the attached table of parameters, a rod with a size of Φ12mmⅹ83mm is formed. material.

[0040] Parameter Schedule 1

[0041]

[0042] Parameter Schedule II

[0043]

[0044] Use laser selective melting equipment to print TA15 titanium alloy powder (phase transition temperature 995°C), and print it into a bar of Φ12mmⅹ83mm. The bar stock is separated from the substrate by wire cutting, and then the bar stock is placed in a vacuum heat treatment furnace for heat treatment.

[0045] First, heat the bar to 970°C for 1 hour at a heating rate of 10°C / min, turn off the heating program, and cool down to room temperature with the furnace; then heat the once heat-treated bar to 930°C for 3 hours at the same heating rate, and take out the sample A...

Embodiment 3

[0048] Taking TA15 (Ti-6Al-2Zr-1Mo-1V) powder particles with an average particle size of 43.6μm and the composition as shown in the attached table of parameters as the forming raw material, according to the process parameters shown in the attached table of parameters, a rod with a size of Φ12mmⅹ83mm is formed. material.

[0049] Parameter Schedule 1

[0050]

[0051] Parameter Schedule II

[0052]

[0053] Use laser selective melting equipment to print TA15 titanium alloy powder (phase transition temperature 995°C), and print it into a bar of Φ12mmⅹ83mm. The bar stock is separated from the substrate by wire cutting, and then the bar stock is placed in a vacuum heat treatment furnace for heat treatment.

[0054] First, heat the bar to 970°C for 2 hours at a heating rate of 10°C / min, turn off the heating program, and cool down to room temperature with the furnace; then heat the once heat-treated bar to 950°C for 3 hours at the same heating rate, and take out the sample ...

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Abstract

The invention belongs to the field of selective laser melting and forming, and specifically discloses a heat treatment method for obtaining a three-state structure in SLM formed titanium alloy. The invention adjusts SLM forming to be close to α and α+β through multiple heat treatments in different temperature ranges in three stages The structure of titanium alloy is made from the original acicular martensite structure (the forming direction is coarse equiaxed grains, the vertical forming direction is coarse columnar grains, and the inside of equiaxed crystals and columnar grains is acicular martensite, and contains a large number of twins. crystal) into a three-state structure to improve the poor plasticity characteristics of near α and α+β titanium alloys formed by SLM, and obtain tensile mechanical properties with better matching of strength and plasticity.

Description

technical field [0001] The invention belongs to the field of laser selective melting and forming, in particular to a heat treatment method for obtaining three-state structure in SLM forming titanium alloy. Background technique [0002] Titanium alloy has the characteristics of low density, high specific strength, low elastic modulus, low thermal conductivity, tensile strength close to yield strength, good heat resistance and low temperature resistance, and good damping resistance. Among them, α+β titanium alloy has excellent processing plasticity; near α titanium alloy has both the advantages of α titanium alloy and α+β titanium alloy, and has excellent high temperature creep resistance, good thermal strength, thermal stability and flexibility. Weldability, excellent processing plasticity. The long-term working temperature is above 300 ℃, and it is widely used in aerospace and navigation fields. [0003] SLM (Selective laser melting, SLM) technology uses a focused high-ene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F10/64C22F1/18B33Y40/20
CPCB22F3/24C22F1/183B33Y40/20B22F2003/248Y02P10/25
Inventor 张升张钰琪李业韬丁明路臧勇
Owner UNIV OF SCI & TECH BEIJING
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