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Multi-step circulation heat treatment method for improving mechanical performance of traditional cast gamma-TiAl alloy

A heat treatment method and alloy mechanics technology, applied in the field of multi-step cyclic heat treatment of cast γ-TiAl alloy, can solve the problems of coarse structure and poor plasticity, and achieve the effect of improving room temperature performance

Active Publication Date: 2016-01-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of coarse structure and poor plasticity of cast γ-TiAl alloy at room temperature, and provide a multi-step cycle heat treatment method for improving the mechanical properties of traditional cast γ-TiAl alloy

Method used

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  • Multi-step circulation heat treatment method for improving mechanical performance of traditional cast gamma-TiAl alloy
  • Multi-step circulation heat treatment method for improving mechanical performance of traditional cast gamma-TiAl alloy
  • Multi-step circulation heat treatment method for improving mechanical performance of traditional cast gamma-TiAl alloy

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specific Embodiment approach 1

[0018] Embodiment 1: A multi-step cyclic heat treatment method for improving the mechanical properties of traditional cast γ-TiAl alloys in this embodiment is carried out in the following steps:

[0019] 1. Alloy preparation: Put titanium sponge, aluminum ingots, substances containing element X and pure yttrium in a vacuum water-cooled copper crucible melting furnace for melting. After the alloy is melted, keep the melt for 10-20 minutes, and then put The body is poured into a rod-shaped shell, and sandblasted after shelling to obtain a γ-TiAl alloy before heat treatment; the substance containing element X is aluminum alloy or a mixture of aluminum alloy and pure Cr, wherein the aluminum alloy is One or more of Al-Nb master alloy, Al-V master alloy and Al-Mn, and the element X in the substance containing element X is a non-aluminum element; the γ-TiAl alloy before heat treatment The content of each element is Ti-(46~48)Al-(0~4)X-0.05Y(at%), and the rod-shaped shell is kept at ...

specific Embodiment approach 2

[0038] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the titanium sponge described in step 1 is grade 0 titanium sponge, and its purity is >99.9wt.%. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0039] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the purity of the aluminum ingot in step 1 is >99.99wt.%. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a multi-step circulation heat treatment method for improving the mechanical performance of traditional cast gamma-TiAl alloy in order to solve the problems of a rough room temperature structure and poor plasticity of the cast gamma-TiAl alloy. The multi-step circulation heat treatment method comprises the steps of preparation of alloy, hot isostatic pressing treatment, homogenizing treatment, alpha2 / gamma phase spheroidizing cycle heat treatment, equiaxed heat treatment and near-lamellar / full-lamellar heat treatment. According to the multi-step circulation heat treatment method, the structure development process is well controlled, a rough lamellar structure is converted into a fine equiaxed structure, and the room temperature performance of the gamma-TiAl alloy is effectively improved. According to the alloy treated through the method, the ductility is 1.9-2.3%, the yield strength is 430-450 Mpa, the breaking strength is 540-570 Mpa, and the aerospace application standards of the TiAl alloy are completely met.

Description

technical field [0001] The invention relates to a multi-step cycle heat treatment method for casting gamma-TiAl alloy. Background technique [0002] γ-TiAl alloy has low density, high specific strength, excellent high temperature oxidation resistance and creep resistance, and has been widely concerned, and has broad application prospects in aerospace and industrial fields. However, the γ-TiAl alloy intermetallic compound has ceramic properties, and its poor room temperature plasticity has become an important reason restricting its wide application. The preparation of γ-TiAl alloy by investment casting has incomparable advantages over other processes, especially in the production of thin-walled components with complex shapes. Significantly reduce loss, improve material utilization, and have been successfully applied in GE aerospace engines. However, the as-cast γ-TiAl structure is mostly coarse columnar grain structure, and there are defects such as shrinkage porosity and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
Inventor 陈玉勇陈光曹守臻王敏智田竟肖树龙韩建超
Owner HARBIN INST OF TECH
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