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Heat treatment method for obtaining tri-state structure in SLM forming titanium alloy

A heat treatment furnace, β titanium alloy technology, applied in the direction of process efficiency improvement, additive manufacturing, energy efficiency improvement, 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: 2021-08-20
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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  • Heat treatment method for obtaining tri-state structure in SLM forming titanium alloy
  • Heat treatment method for obtaining tri-state structure in SLM forming titanium alloy
  • Heat treatment method for obtaining tri-state structure in SLM forming titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0031] Parameter Schedule I

[0032]

[0033] Parameter Schedule II

[0034]

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

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

Embodiment 2

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

[0040] Parameter Schedule I

[0041]

[0042] Parameter Schedule II

[0043]

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

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

Embodiment 3

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

[0049] Parameter Schedule I

[0050]

[0051] Parameter Schedule II

[0052]

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

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

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Abstract

The invention belongs to the field of selective laser melting forming, and particularly discloses a heat treatment method for obtaining a tri-state structure in an SLM forming titanium alloy. According to the heat treatment method, through multiple heat treatment of three stages of different temperature intervals, SLM forming near alpha and alpha + beta titanium alloy structures are adjusted, the original needle-like martensite structure (the forming direction is thick and large isometric crystals, the vertical forming direction is thick and large columnar crystals, the isometric crystals and the columnar crystals are internally provided with needle-like martensite, and a large number of twin crystals are included) is converted into the tri-state structure, the characteristic that the SLM forming near alpha and alpha + beta titanium alloy plasticity is poor is improved, and the tensile mechanical property with the strength and plasticity well matched is obtained.

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 triple-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, close to tensile strength and 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 the advantages of both α titanium alloy and α+β titanium alloy, and has excellent high temperature creep resistance, good thermal strength, thermal stability and reliability. Weldability, excellent processing plasticity. The long-term working temperature is above 300°C, and it is widely used in aerospace and navigation fields. [0003] SLM (Selective laser melting, SLM) technology uses a focused hig...

Claims

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Application Information

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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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