ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 30    No. 3    March 2020

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Effect of microstructure inhomogeneity on mechanical properties of different zones in TA15 electron beam welded joints
Cai-yan DENG1, Ce LIU1, Bao-ming GONG1, Cheng-ze ZHANG2, Chang LIU1, Yong LIU1
(1. Key Laboratory of Advanced Joining Technology of Tianjin, School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China;
2. Changguang Satellite Technology Co., Ltd., Changchun 130000, China
)
Abstract: The effects of microstructure inhomogeneity on the mechanical properties of different zones in TA15 electron beam welded joints were investigated using a micromechanics-based ?nite element method. Considering the indentation size effect, the mechanical properties for constituent phases of the base metal (BM) and heat affected zone (HAZ) were determined by the instrumented nano-indentation test. The macroscopic mechanical properties of BM and HAZ obtained from the tensile test agree well with the numerical results. The incompatible deformation between the constituent phases tends to localize along the softer primary phase α where failure usually initiates in form of localized plastic strain. Compared with the BM, the mechanical properties of constituent phases in the HAZ differ substantially, leading to more serious strain localization behavior.
Key words: microstructure inhomogeneity; strain localization; electron beam welding; titanium alloy; finite element analysis
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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