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《Journal of Dalian Railway Institute》 2006-03
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Studies on Microstructures and Physical Properties of Argon-(shielded) Arc Welding Joint of GH4169 Superalloy at 650℃

XU Hong-ji~1,TIAN Shi-ying~2,XIE Ming~1,GUO De-lun~2,LI Cong-qing~2(1.School of Materials Science & Engineering,Dalian Jiaotong University,Dalian 116028,China;2.Beijing Aeronautical Manufacturing Technology Research Institute,Beijing 100024,China)  
Argon-(shielded) arc welding techniques is used to weld superalloy GH4169.Microstructures and physical properties of the joint and base metal are analyzed by metallurgical structure method,and high temperature strength is tested at 650℃.The results show that the high temperature strength of the joint is better than that of the base metal,while the plasticity of the joint is deterioraed compared with the base metal.The microstructure of base metal is austenite with some strengthening dispersion phases γ′and γ″,and the microstructure of joint is tree-like austenite with a weak bonding due to coarser grain size at fusion area by overheating.
【CateGory Index】: TG407
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