摘要
以304奥氏体不锈钢为研究对象,选用3种不同热处理制度处理得到3种状态的试样。利用电子背散射衍射表征技术对每个状态试样的微观组织进行表征,将试样浸泡于三氯化铁溶液中测试耐点腐蚀性能。结果表明,点腐蚀易发生于大角度晶界附近及晶格畸变大的区域;增加的热处理温度使得晶粒粗化,单位面积大角度晶界长度降低,且能够形成高比例的有序度高的重位点阵晶界;同时,增加的热处理温度使得晶格畸变减小,微观结构更均匀,最终使得304奥氏体不锈钢抗点腐蚀性能更好。
Three kinds of 304 austenitic steel specimens undergone different heat treatments were fabricated. Microstructure of each specimen was characterized by using the electron backscatter diffraction technique in a scanning electron microscopy. The pitting corrosion experiment was conducted in 6% Fe Cl3 solution. The results show that pitting preferentially forms near the high angle grain boundaries and in the areas with high microstrains. The increase of heating temperature make the grains coarsen and the decrease of the length of the high angle boundaries per unit area,while the fraction of the coincidence site lattice grain boundaries with low energies increases with the heating temperature. A higher temperature induces less crystalline defects and a more homogeneous passive film on the specimen,which improves the pitting corrosion resistance of the 304 austenitic steel.
作者
孙京丽
陈斌
刘帆
王玥
许恒庭
曹雪峰
Sun Jingli;Chen Bin;Liu Fan;Wang Yue;Xu Hengting;Cao Xuefeng(Shanghai Spaceflight Precision Machinery Institute,Shanghai 201600,China;School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing Jiangsu 210094,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2019年第2期119-125,共7页
Heat Treatment of Metals
基金
上海市浦江人才计划(15PJ1433600)
关键词
晶粒尺寸
晶界
微应变
电子背散射衍射
点腐蚀
grain size
grain boundary
microstrain
electron backscatter diffraction technique
pitting corrosion
