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Ti2AlNb-based alloy fusion welding joint heat treatment process

A technology for fusion welding joints and post-weld heat treatment, which is applied in the field of heat treatment technology of Ti2AlNb-based alloy fusion welding joints, can solve the problems of poor plasticity at high temperature, comprehensive mechanical properties that do not meet engineering application, and uneven structure of welded joints. The effect of high temperature plasticity improvement

Active Publication Date: 2016-10-26
BEIJING POWER MACHINERY INST
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a post-welding heat treatment process for intermetallic compound Ti2AlNb-based alloys, which can solve the problem of uneven microstructure of welded joints after welding of Ti2AlNb-based alloys, poor high-temperature plasticity, and comprehensive mechanical properties. Does not meet engineering application

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[0013] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, for purposes of explanation and not limitation, specific details are set forth in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details.

[0014] The inventor has obtained the best embodiment of the present invention through repeated tests, earnest research, and repeated comparisons.

[0015] The inventor first studied the effect of post-weld aging heat treatment on the microstructure and properties of welded joints:

[0016] Since the Ti2AlNb alloy laser welded microstructure is a coarse B2 phase, the mechanical properties are poor, so post-weld heat treatment is required to improve the Ti2AlNb alloy welded microstructure. According to the stable ph...

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Abstract

The invention discloses a Ti2AlNb-based alloy fusion welding joint heat treatment process, wherein the steps for carrying out after-welding heat treatment on a Ti2AlNb-based alloy fusion welding joint comprise: heating to achieve a three-phase region (O+[alpha]2+B2), carrying out thermal insulation until the structure change is uniform, and carrying out furnace cooling; and using three-phase region (O+[alpha]2+B2) high temperature annealing to adjust the composition, the size and the grain boundary morphology of the precipitated phase in the joint structure, and eliminate the welding joint residual stress. According to the present invention, the problems that the structure of the intermetallic compound Ti2AlNb-based alloy fusion welding joint is not uniform and the comprehensive mechanical property is poor can be solved; with the after-welding heat treatment method, the welding joint structure can be improved, and the joint room temperature and high temperature comprehensive mechanical properties can be improved so as to obtain the high quality welding joint; and the Ti2AlNb-based alloy fusion welding joint heat treatment process is mainly used for the after-fusion welding heat treatment process of the intermetallic compound Ti2AlNb alloy.

Description

technical field [0001] The invention relates to the technical field of heat treatment of Ti2AlNb-based alloy intermetallic compounds, in particular to a heat treatment process for Ti2AlNb-based alloy welded joints. Background technique [0002] Ti2AlNb-based alloys, also known as O-phase alloys, are the most promising lightweight and high-temperature resistant aerospace structural materials to replace superalloys. The performance of Ti2AlNb-based alloys is very sensitive to the structure, and the welding heat cycle will change the structure of the material, resulting in the inhomogeneity of the structure and performance at the joint. Generally, the fusion-welded joint under welding conditions is composed of a single B2 phase, and the grains are relatively coarse. It has high strength and certain plasticity at room temperature, but at high temperature, the joint is severely embrittled and intergranular fracture occurs. Fracture features. Many aerospace components work conti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/50C22F1/18
CPCC21D9/50C22F1/18Y02P10/20
Inventor 杨继平王亚军马瑞周凯梁晓波
Owner BEIJING POWER MACHINERY INST
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