X65和X80管线钢在高pH值溶液中的应力腐蚀开裂行为及机理

金属学报, 2013, 49(12): 1590-1596. doi: 10.3724/SP.J.1037.2013.00315

X65和X80管线钢在高pH值溶液中的应力腐蚀开裂行为及机理

朱敏 ^1, , 刘智勇 ^2, , 杜翠薇 ^3, , 李晓刚 ^4, , 李建宽 ^5, , 李琼 ^6, , 贾静焕 ^7,

1.北京科技大学材料科学与工程学院,北京,100083

2.北京科技大学材料科学与工程学院,北京,100083

3.北京科技大学材料科学与工程学院,北京,100083

4.北京科技大学材料科学与工程学院,北京,100083

5.北京科技大学材料科学与工程学院,北京,100083

6.北京科技大学材料科学与工程学院,北京,100083

7.北京科技大学材料科学与工程学院,北京,100083

基金项目: National Natural Science Foundation of China(51131001) National High Technology Research and Development Program of China(2012AA040105) 国家自然科学基金项目51131001和国家高技术研究发展计划项目2012AA040105资助

关键词：管线钢 , 应力腐蚀开裂 , 高pH值溶液

STRESS CORROSION CRACKING BEHAVIOR AND MECHANISM OF X65 AND X80 PIPELINE STEELS IN HIGH pH SOLUTION

Keywords： pipeline steel , stress corrosion cracking , high pH solution

采用电化学测试和慢应变速率拉伸实验(SSRT)研究了X65和X80管线钢在高pH值溶液中的应力腐蚀开裂(SCC)行为及机理.结果表明,X65钢在高pH值溶液中的开裂方式是沿晶断裂(IGSCC);X80钢在高pH值溶液中的开裂方式是初期裂纹沿晶扩展与后期裂纹穿晶扩展断裂的混合模式,主要表现为穿晶断裂(TGSCC)特征.X80钢在高pH值溶液中的断裂方式与其组织及强度有关,其裂尖pH值降低是发生TGSCC的重要原因.X65钢在高pH值溶液中的SCC机理为阳极溶解(AD)机理;而X80钢为阳极溶解(AD)+氢脆(HE)机理.

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