摘要
在高温高压水环境中,采用慢应变速率拉伸试验方法,研究了不同pH值对304L不锈钢应力腐蚀开裂行为的影响规律,并通过扫描电镜对试样断口形貌进行观察与分析.结果表明:在300℃时,304L不锈钢在弱酸性和弱碱性溶液中的应力腐蚀开裂敏感性较大,且酸性越强,敏感性越大.在中性溶液中,304L不锈钢的强度和塑性损失较小,应力腐蚀敏感性较小,断口分析与之吻合.
The effects of pH values on the stress corrosion cracking(SCC)of 304L stainless steel in high-temperature and high-pressure water were studied using slow strain rate tension(SSRT)tests.The fracture morphology of SCC specimens was analyzed with the aid of scanning electron microscopy(SEM).It is shown that 304L stainless steel exhibits a high susceptibility to SCC in weak alkaline and acidic solutions at 300 ℃,and the susceptibility increases by decreasing the pH value of the solution.In neutral solutions,both the strength and toughness of 304L stainless steel display a limited loss,indicating that 304L stainless steel has a low susceptibility to SCC.Fractography analysis is also consistent with these conclusions.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2010年第12期1569-1573,共5页
Journal of University of Science and Technology Beijing
基金
国家自然科学基金资助项目((No.50871020)
关键词
不锈钢
应力腐蚀开裂
腐蚀
拉伸试验
stainless steel
stress corrosion cracking
corrosion
tensile testing