Improved resistance to hydrogen embrittlement in the nugget zone of friction stir welded medium Mn steel via post-welding annealing

被引：6
作者：
Wang, Y. Q. [1 ]
Su, J. X. [1 ]
Jin, Z. Q. [1 ]
Duan, R. H. [2 ]
Xie, G. M. [1 ]
机构：
[1] Northeastern Univ, State Key Lab Rolling & Automat, 3 Wenhua Rd, Shenyang 110819, Peoples R China
[2] Jiangsu Univ Sci & Technol, Sch Mat Sci & Engn, Zhenjiang 212003, Peoples R China
来源：
CORROSION SCIENCE | 2024年 / 227卷
关键词：
Friction stir welding; Medium Mn steel; Intercritical annealing; Reversed austenite; Hydrogen embrittlement; INDUCED PLASTICITY STEEL; AUSTENITE REVERSION; MARTENSITE; BEHAVIOR; MICROSTRUCTURE; MORPHOLOGY; TOUGHNESS; STABILITY; MECHANISM; CRACKING;
D O I：
10.1016/j.corsci.2023.111786
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this work, medium-Mn steel was friction stir welded and then intercritically annealed. Hydrogen diffusion and hydrogen embrittlement (HE) behavior in the nugget zone (NZ) were investigated. The as-welded NZ exhibited the highest HE index (HEI) of 79.2%, and hydrogen-induced cracks propagated along the grain boundary, probably depending on grain boundary decohesion caused by H segregation. However, this condition was improved by post-welding annealing since fine lath reversed austenite, acting as a strong hydrogen trap, was introduced into the ferritic matrix, inhibiting the segregation of H to grain boundaries. Ultimately, the lowest HEI of 10.7% was obtained in the as-annealed NZ.
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页数：15
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