Mechanisms of Mitigating Chloride-Induced Stress Corrosion Cracking of Austenitic Steels by Laser Shock Peening

被引:0
|
作者
Yoo, Yongchul [1 ]
Yan, Xueliang [1 ]
Wang, Fei [1 ]
Zhu, Qiuchi [2 ]
Lu, Yongfeng [2 ]
Cui, Bai [1 ,3 ]
机构
[1] Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA
[2] Univ Nebraska, Dept Elect & Comp Engn, Lincoln, NE 68588 USA
[3] Univ Nebraska, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA
基金
美国国家科学基金会;
关键词
austenitic steel; laser shock peening; stress corrosion cracking; STAINLESS-STEELS; RESIDUAL-STRESSES; HYDROGEN EMBRITTLEMENT; SUSCEPTIBILITY; PREDICTION; MODEL; MICROSTRUCTURE; DEFORMATION; INITIATION; ALLOYS;
D O I
10.5006/3990
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This study investigates the effect of laser shock peening (LSP) on the chloride-induced stress corrosion cracking (SCC) of 304 austenitic steels. LSP can induce a high compressive residual stress to a depth of 700 mu m and plastic deformation structures of dislocations, deformation twins, and stacking faults. Constant-load SCC tests in MgCl2 solution suggested that LSP can retard the crack initiation and slow the crack growth. LSP-treated subsurface layers experience ductile fracture while the central regions exhibit intergranular SCC. The LSP-induced deformation structures may impede dislocation slips, while the LSP-induced compressive residual stress can lessen the stress intensity factor of crack tips and decrease the local stress for film rupture.
引用
收藏
页码:494 / 502
页数:9
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