Intergranular Corrosion Performance at Pulse Current Crack Arresting Area of Austenitic Stainless Steel and Its Evaluation Method
摘 要
采用草酸电解浸蚀试验和恒电位极化试验研究了敏化处理前后304不锈钢脉冲电流止裂处的晶间腐蚀性能,得到适合评价裂纹止裂处晶间腐蚀性能的方法。结果表明:经脉冲电流止裂后,止裂处的凝固区、细晶区、形变马氏体区晶界处均未析出碳化物,而经恒电位极化后,晶界处的钝化膜完整,未发生晶间腐蚀;经草酸电解后,敏化试样止裂处不同区域的晶界处均发生了腐蚀,说明草酸电解法不能区分脉冲止裂后不同微区晶间腐蚀性能的差异;经恒电位极化后,敏化试样止裂处凝固区和细晶区晶界处的钝化膜稳定性较好,具有一定的耐晶间腐蚀能力,形变马氏体区发生了严重的晶间腐蚀;恒电位极化法是评价奥氏体不锈钢脉冲电流止裂处晶间腐蚀性能的一种有效方法。
Abstract
The intergranular corrosion performance at pulse current crack arresting area of 304 stainless steel before and after sensitization was studied by oxalic acid electrolytic etching test and potentiostatic polarization test, and a method suitable for evaluating the intergranular corrosion performance at crack arresting area was determined. The results show that there was no carbide precipitated at grain boundaries in the solidification zone, fine-grained zone and deformed martensite zone at crack arresting area; after potentiostatic polarization, the passive film at grain boundaries was intact, indicating intergranular corrosion didn't occur at the crack arresting area. The corrosion occurred at grain boundaries of different areas at crack arresting area of the sensitized specimen, indicating that the oxalic acid electrolysis method failed to distinguish the difference in intergranular corrosion performance among different micro-zones after pulse crack arrest. After potentiostatic polarization test, the passivation films at grain boundaries in the solidification zone and fine-grained zone at crack arresting area of the sensitized specimen had better stability and a certain ability to resist intergranular corrosion. The severe intergranular corrosion occurred in the defermed martensite zone. The potentiostatic polarization method can be used to evaluate the intergranular corrosion performance at pulse current crack arresting area of austenitic stainless steels.
中图分类号 TG174.3 DOI 10.11973/jxgccl202003011
所属栏目 材料性能及应用
基金项目 国家自然科学基金资助项目(51705077);福建省自然科学基金资助项目(2018J01768);福州大学贵重仪器设备开放测试基金资助项目(2019T028)
收稿日期 2019/8/28
修改稿日期 2020/2/16
网络出版日期
作者单位点击查看
备注张朱武(1984-),男,福建永泰人,副教授,博士
引用该论文: ZHANG Zhuwu,PAN Guangguo,JIANG Yan,XU Chengwei. Intergranular Corrosion Performance at Pulse Current Crack Arresting Area of Austenitic Stainless Steel and Its Evaluation Method[J]. Materials for mechancial engineering, 2020, 44(3): 56~61
张朱武,潘光国,蒋艳,许承伟. 奥氏体不锈钢脉冲电流止裂处的晶间腐蚀性能及其评价方法[J]. 机械工程材料, 2020, 44(3): 56~61
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参考文献
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【2】胡宇达,白象忠.电流通入瞬间导电板内裂尖附近的热电磁效应[J].应用力学学报,2000,17(3):41-45.
【3】胡宇达,白象忠.脉冲电流在导电薄板裂纹止裂技术中的应用[J].固体力学学报,2000,21(4):335-340.
【4】HASEBE N, BUCHER C, HEUER R. Heat conduction and thermal stress induced by an electric current in an infinite thin plate containing an elliptical hole with an edge crack[J]. International Journal of Solids and Structure, 2010, 47: 138-147.
【5】付宇明,郑丽娟,刘禹.含半埋藏空间裂纹的Cr12冷冲凹模电磁热止裂分析[J].中国机械工程,2008,19(10):1224-1227.
【6】LIU Q Q, THOMAS J C. Joule heating behaviors around through crack emanating from circular hole under electric load[J]. Engineering Fracture Mechanics, 2014, 123: 2-20.
【7】邓德伟,刘倩倩,牛婷婷,等.脉冲电流对奥氏体不锈钢止裂效果的影响[J].热加工工艺,2015,44(16):49-52.
【8】白象忠,乔桂英,付宇明,等.导体内部裂尖处的相变与焊口的形成[C]//全国疲劳与断裂学术会议论文集. 北京:气象出版社,2000.
【9】张述林,李敏娇,王晓波,等.18-8奥氏体不锈钢的晶间腐蚀[J].中国腐蚀与防护学报,2007,27(2):124-128.
【10】金维松,郎宇平,荣凡,等.EPR法评价奥氏体不锈钢晶间腐蚀敏感性的研究[J].中国腐蚀与防护学报,2007,27(1):54-59.
【11】张朱武,李炜,邹松,等.脉冲电流作用下熔孔尺寸对止裂性能影响的仿真研究[J].福州大学学报(自然科学版),2019(3):372-378.
【12】徐瑞芬,许淳淳,欧阳维真,等.奥氏体不锈钢的马氏体相变对耐蚀性的影响[J].北京化工大学学报,1998,25(2):57-63.
【13】方智,吴荫顺.形变诱发马氏体相变对304不锈钢在活化状态下的电化学行为的影响[J].腐蚀科学与防护技术,1997,9(1):75-78.
【14】徐瑞芬,许淳淳,薛慧勇,等.奥氏体不锈钢中马氏体含量对其钝化膜稳定性的影响[J].材料保护,1998(9):10-12.
【15】LIN H Q, ZHAO Y G, GAO Z M, et al. Effects of pulse current stimulation on the thermal fatigue crack propagation behavior of CHWD steel [J]. Materials Science & Engineering: A, 2008, 478(1/2): 93-100.
【16】胡钢,许淳淳,袁俊刚. 奥氏体304不锈钢形变诱发马氏体相变与磁记忆效应[J].无损检测,2008,30(4):23-26.
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