研究了紧凑拉伸(CT)试样厚度对25Cr2NiMo1V钢在566 ℃时, 蠕变裂纹扩展(CCG)速率的影响规律及其机理。结果表明: 试样厚度对CCG速率的影响与载荷水平(C*)相关; 在低载荷水平区, 随试样厚度的增加, 面外拘束水平增大, 试样趋向于以沿晶蠕变脆性方式断裂, CCG速率增大; 在高载荷水平区, 不同厚度的试样均以沿晶和穿晶的混合方式发生蠕变延性断裂, CCG速率基本不受试样厚度的影响; CCG速率与载荷水平在双对数坐标中并非呈单一的线性关系, 而是由不同斜率的两段直线构成, 低载荷水平区的直线斜率低于高载荷水平区的, 如果用高载荷水平区的CCG速率数据外推得到低载荷水平区的CCG速率, 将得到非保守的结果。
所属栏目
材料性能及其应用国家自然科学基金资助项目(50835003, 51075149); 国家高技术研究发展(“863”)计划课题项目(2009AA04Z409, 2009AA04Z421)
收稿日期
2011/10/222011/12/1
作者单位
谈建平:华东理工大学机械与动力工程学院, 承压系统安全科学教育部重点实验室, 上海 200237
王国珍:华东理工大学机械与动力工程学院, 承压系统安全科学教育部重点实验室, 上海 200237
轩福贞:华东理工大学机械与动力工程学院, 承压系统安全科学教育部重点实验室, 上海 200237
涂善东:华东理工大学机械与动力工程学院, 承压系统安全科学教育部重点实验室, 上海 200237
备注
谈建平(1986-), 男, 上海人, 博士研究生。
引用该论文:
TAN Jian-ping,WANG Guo-zhen,XUAN Fu-zhen,TU Shan-dong.The Effect of CT Specimen Thickness on High Temperature Creep Crack Growth Rate of 25Cr2NiMo1V Steel[J].Materials for mechancial engineering,2012,36(10):42～46
谈建平,王国珍,轩福贞,涂善东.紧凑拉伸试样厚度对25Cr2NiMo1V钢高温蠕变裂纹扩展速率的影响[J].机械工程材料,2012,36(10):42～46
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