物理化学学报 >> 2003, Vol. 19 >> Issue (07): 616-620.doi: 10.3866/PKU.WHXB20030710

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应变速率和电位对应力腐蚀裂纹扩展的影响

牛林;张长桥;林海潮   

  1. 山东大学化学与化工学院,济南　250100;1中国科学院金属研究所,金属腐蚀与防护国家重点实验室 ,沈阳　110016
  • 收稿日期:2002-11-25 修回日期:2003-02-07 发布日期:2003-07-15
  • 通讯作者: 牛林 E-mail:lniu@sdu.edu.cn

Effect of Strain Rate and Potential on the Propagation of Stress Corrosion Crack

Niu Lin;Zhang Chang-Qiao;Lin Hai-Chao   

  1. School of Chemistry and Chemical Engineering, Shandong University, Jinan　250100;　1State Key Laboratory for Corrosion and Protection of Metals, Institute of Metal Research, Chinese Academy of Sciences, Shenyang　110016
  • Received:2002-11-25 Revised:2003-02-07 Published:2003-07-15
  • Contact: Niu Lin E-mail:lniu@sdu.edu.cn

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摘要： 以滑移-溶解-再钝化模型为基础,推导出应力腐蚀裂纹扩展速率与裂尖应变速率和电位之间的理论公式.计算表明,在裂纹扩展速率与裂尖应变速率的关系曲线中有两个特征区域.裂纹扩展速率在区域I随裂尖应变速率增加而增大,而在区域II不随裂尖应变速率的改变而变化.用慢应变速率拉伸技术（SSRT）测量了304L不锈钢的裂纹增长速率.当电位控制在区域II的阳极区时,理论计算的裂纹扩展速率与实验得到的结果比较吻合.

关键词: 应力腐蚀, 裂纹扩展, 304L不锈钢, 应变速率, 电位

Abstract: On the basis of the model of slip-bare metal dissolution-repassivation and crack-tip strain analysis, a theoretical equation of stress corrosion crack propagation rate as a function of crack-tip strain rate and potential for 304L stainless steel in acidic chloride solution was deduced. The theoretical prediction showed that there are two regions in the curve of crack propagation rate with the crack-tip strain rate. In region I, the crack growth rate increases with increasing crack-tip strain rate. In region II, the crack propagation rate is independence of the crack-tip strain rate. The crack propagation rate of 304L stainless steel in acidic chloride solution has been measured by slow strain rate testing (SSRT) technique. The crack propagation rate calculated theoretically was consistent with the experimental results in region II when potential was controlled in anodic region. Fig.8Ref.12

Key words: Stress corrosion, Crack propagation, 304L stainless steel, Strain rate, 　Potential