张振,胡正飞,张乐福

• 1:同济大学材料科学与工程学院
• 2:上海交通大学机械与动力工程学院

摘要(Abstract)：

在600℃/25 MPa超临界水(SCW)环境下采用慢拉伸试验(SSRT)与断口形貌分析技术研究了溶解氧(DO)对国产P92钢应力腐蚀开裂的影响规律。SSRT结果表明,P92钢在0~500μg/L溶氧溶度范围具有应力腐蚀开裂敏感性,且随溶氧溶度升高敏感性增强。通过扫描电镜(SEM)对试样断口截面及侧面形貌进行分析,结果表明随着溶氧溶度的升高,材料表面氧化层厚度增大,裂纹扩展速率增大;断口扩展区在高溶解氧含量下出现沿氧化物颗粒边界扩展的二次裂纹,其形成可能由氧化层内部萌生的微裂纹扩展至表面所致。

关键词(KeyWords)： P92钢;超临界水;溶解氧;应力腐蚀开裂

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(50871076)

作者(Author): 张振,胡正飞,张乐福

DOI: 10.13289/j.issn.1009-6264.2016.09.019

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