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
CN113275600AActive Publication Date: 2021-08-20UNIV OF SCI & TECH BEIJING
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
UNIV OF SCI & TECH BEIJING
Publication Date
2021-08-20

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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.
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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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