Microstructure and mechanical properties of dissimilar materials joints between T92 martensitic and S304H austenitic steels |
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Authors: | Jian Cao Yi Gong Kai Zhu Zhen-Guo Yang Xiao-Ming Luo Fu-Ming Gu |
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Affiliation: | 1. Department of Materials Science, Fudan University, Shanghai 200433, PR China;2. Shanghai Institute of Special Equipment Inspection & Technical Research, Shanghai 200062, PR China |
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Abstract: | In this paper, T92 martensitic steel and S304H austenitic steel were welded by gas tungsten arc welding (GTAW) process. Microstructural features and mechanical properties of T92 and S304H dissimilar materials joints were investigated. The results showed that the part of the joints with relatively weak tensile strength was T92 coarse-grained heat affected zone (CGHAZ), while the part of the joints which revealed relatively weak toughness was weld metal. The decrease of tensile strength in T92 CGHAZ was due to its coarse tempered martensite structure. Weak toughness of the joints was resulted from the coarse dendritic austenite of the weld metal. However, the weld metal in transverse direction of the joints was provided higher tensile strength by the orientation distribution of grains compared with T92 CGHAZ. |
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Keywords: | Microstructure Mechanical properties Dissimilar materials joints |
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