Comparison of the Stress Corrosion Cracking Behaviour of AISI 304 Pipes Welded by TIG and LBW  

作　　者：Ji-Jin Xu Shuai Wang Ze Chai Chun Yu Jun-Mei Chen Hao Lu 

机构地区：[1]Shanghai Key Laboratory of Materials Laser Processing and Modification,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai,200240,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2021年第4期579-589,共11页金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.51405297)。

摘　　要：The stress corrosion cracking(SCC)behaviour of AISI 304 pipe girth welds which were welded by a single-pass laser beam welding(LBW)and a multi-pass tungsten inert gas welding(TIG),respectively,was studied by the slow strain rate tests combined with the electrochemical corrosion tests.The results show that fracture of both the TIG joint and LBW joint occurs in the heat-affected zone(HAZ).According to the electron-backscattered diffraction observation of the micro structures,comparison of potentiodynamic polarization curves and X-ray photoelectron spectroscopy analysis of corrosion products on HAZs of the two joints after the electrochemical tests,the LBW joint exhibits better SCC resistance than the TIG joint in corrosion environments,due to the synthetic effect of more Cr_(2)O_(3) in corrosion products,finer grains,lower residual strain and higher δ-ferrite content in its HAZ.Although the TIG joint has better mechanical property,considering lower SCC susceptibility and higher production efficiency of the LBW joint,the LBW promisingly replaces the TIG for welding of AISI304 pipes in the nuclear power industry.

关 键 词：Laser beam welding Slow strain rate test Stress corrosion cracking Tungsten inert gas welding AISI 304 stainless steel 

分 类 号：TM623[电气工程—电力系统及自动化] TG457.6[金属学及工艺—焊接]