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• Main Authors: Si-sheng Ye, 葉思勝
• Other Authors: Jiun-Ren Hwang
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/9zmp26

碩士 === 國立中央大學 === 機械工程學系 === 104 === This study discussed mechanical properties and microstructures for dissimilar-metal welding of A508 low-alloy steel and SS304L stainless steel. Multipass butt welded specimens were prepared by gas tungsten arc welding (GTAW) method with 52M Ni-based filler material. The effects of different post-weld heat treatment processes and locations of weldment on the microstructure, tensile strength, impact energy and fracture mechanism were evaluated. The results showed that the variations of microstructures across the weld were large. Columnar grains mixed with fine grains occurred at the interfacial side of the weld. There is a relative soft area in the heat-affected zone of A508 low-alloy steel due to the diffusion of Ni and Cr elements. In general, the impact property of this dissimilar-metal weldment was excellent and many dimples appeared on the fracture surface.