F690超高强钢的腐蚀疲劳裂纹扩展行为及其有限元模拟  

Corrosion Fatigue Crack Growth Behavior of F690 Super High Strength Steel and Its Finite Element Simulation

作　　者：马颖涵 张振 郭孟雨 赵伟[1,2] 张才毅 胡正飞 高珊[3] MA Yinghan;ZHANG Zhen;GUO Mengyu;ZHAO Wei;ZHANG Caiyi;HU Zhengfei;GAO Shan(School of Materials Science and Engineering,Nanjing Institute of Technology,Nanjing 211167,China;Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology,Nanjing 211167,China;Research Institute of Baoshan Iron&Steel Co.,Ltd.,Shanghai 201900,China;School of Materials Science and Engineering,Tongji University,Shanghai 201804,China)

机构地区：[1]南京工程学院材料科学与工程学院,南京211167 [2]江苏省先进结构材料与应用技术重点实验室,南京211167 [3]宝山钢铁股份有限公司研究院,上海201900 [4]同济大学材料科学与工程学院,上海201804

出　　处：《机械工程材料》2021年第4期65-71,80,共8页Materials For Mechanical Engineering

基　　金：国家自然科学基金青年科学基金资助项目(51801098);江苏省大学生创新创业训练计划项目(201911276004Z,202011276066Y);江苏省产学研合作项目(BY2020383)。

摘　　要：采用直流电压降法测试了F690超高强钢在模拟海水中的疲劳裂纹扩展速率,研究了应力比(0.1,02,0.3)和加载频率(0.15,0.30,0.60 Hz)对疲劳裂纹扩展行为的影响;采用基于能量释放率Paris则的扩展有限元方法对腐蚀疲劳过程进行了模拟,并与试验结果进行对比。结果表明:F690钢在模拟海水中的腐蚀疲劳裂纹扩展速率随着应力比或频率的增大而减小;腐蚀疲劳断裂形式为穿晶断裂,且随着频率增加,二次裂纹的宽度变小;模拟得到F690钢的腐蚀疲劳裂纹扩展长度与试验结果相吻合,相对误差小于0.6%,说明采用该扩展有限元方法可有效模拟和预测F690钢的腐蚀疲劳裂纹扩展行为。The fatigue crack growth rate of F690 super-high strength steel in simulated seawater was measured by direct-current voltage drop method,and the effects of stress ratio(0.1,0.2,0.3)and loading frequency(0.15,0.30,0.60 Hz)on the fatigue crack growth behavior were studied.The corrosion fatigue process was simulated by the extended finite element method based on Paris law of energy release rate,and compared with test results.The results show that the corrosion fatigue crack growth rate of F690 steel in simulated seawater decreased with increasing stress ratio or frequency.The corrosion fatigue fracture mode was transgranular fracture,and with increasing frequency,the width of secondary cracks decreased.The simulated corrosion fatigue crack growth length of F690 steel was consistent with the test results,and the relative error was less than 0.6%,indicating that the corrosion fatigue crack growth behavior of F690 steel could be effectively simulated and predicted by the extended finite element method.

关 键 词：F690钢 腐蚀疲劳 裂纹扩展速率 扩展有限元 

分 类 号：TG172.5[金属学及工艺—金属表面处理]