Effect of heat treatment on stress corrosion sensitivity of 7005 aluminum alloy welded joint for high-speed train

doi:10.13251/j.issn.0254-6051.2023.08.027

Abstract

Abstract: Combined with microstructure analysis and fracture characteristics analysis, the effect of post-weld heat treatment of T6 and RRA on stress corrosion susceptibility of 7005 aluminum alloy welded joint was studied by means of slow strain rate tensile test. The results show that after T6 and RRA heat treatment, stress corrosion cracking resistance of the joint are improved, and the stress corrosion sensitivity index of RRA heat treated joints is significantly decreased from 0.37 as welded to 0.05. The microstructure of RRA heat treated joints is uniform, and the tensile strength and elongation after fracture of the joints increase from 329 MPa and 6.8% as welded to 341 MPa and 8.8%, respectively. Thus, RRA heat treatment can significantly improve the mechanical properties and stress corrosion cracking resistance of the joints.

Key words: 7005 aluminum alloy, welded joint, heat treatment, stress corrosion resistance

CLC Number:

TG441.8

Zhang Mingkun, Yang Min, Wang Yu, Zhao Xiang, Jing Deqiang. Effect of heat treatment on stress corrosion sensitivity of 7005 aluminum alloy welded joint for high-speed train[J]. Heat Treatment of Metals, 2023, 48(8): 166-171.

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