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Stress corrosion cracking of laser shock processed stainless steel by slow strain rate test(PDF)

《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

Issue:
2017年03期
Page:
1-5
Research Field:
Publishing date:

Info

Title:
Stress corrosion cracking of laser shock processed stainless steel by slow strain rate test
Author(s):
WEI Xinlong LING Xiang ZHANG Meng
College of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211800, China
Keywords:
laser shock processing microstructure micro-hardness slow strain rate test(SSRT) stress corrosion cracking(SCC)
PACS:
TG172.5
DOI:
10.3969/j.issn.1671-7627.2017.03.001
Abstract:
The 304 stainless steel was processed by laser shock processing(LSP).The stress corrosion cracking(SCC)behavior of 304 stainless steel specimen before and after LSP was evaluated using slow strain rate test(SSRT)in 3.5% NaCl solution at 80 ℃.Surface microstructure modification was evaluated by optical microscopy(OM)and scanning electron microscopy(SEM).Micro-hardness distribution in depth and affected depth were investigated by the micro-hardness tester. Results showed that surface refined grains were not found after LSP.However, micro-hardness was increased by LSP.With the increase of shot number, micro-hardness and thickness of affected layer were increased. SSRT results showed that SCC sensitivities of 304 stainless steel were decreased by LSP.SCC sensitivities of two-side LSP with higher resistance were lower than those of one-side one.

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Last Update: 2017-05-31