层状异质结构316L奥氏体不锈钢的腐蚀行为  

Corrosion behavior of 316L austenitic stainless steel with heterogeneous lamella structure

作　　者：袁滔 黎科奇 刘朝泽 李绍宏[1] 李俊[1] 周烈兴[2] 起华荣[1] 卜恒勇 李萌蘖 YUAN Tao;LI Ke-qi;LIU Chao-ze;LI Shao-hong;LI Jun;ZHOU Lie-xing;QI Hua-rong;BU Heng-yong;LI Meng-nie(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Research Center for Analysis and Measurement,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]昆明理工大学分析测试中心,云南昆明650093

出　　处：《材料热处理学报》2025年第1期105-113,共9页Transactions of Materials and Heat Treatment

基　　金：集成计算材料工程研发平台(202103AA080017);昆明理工大学分析测试基金(2022M20212230187)。

摘　　要：通过变形量为78%的冷轧以及750℃退火处理10和15 min获得由不同比例的再结晶片层、纳米/超细晶片层和残留奥氏体片层构成的层状异质(HL)结构316L奥氏体不锈钢,利用电化学腐蚀试验测试其耐腐蚀性能。结果表明,具有HL结构的试样的耐腐蚀性能优于冷轧试样。这主要归因于退火过程中部分再结晶消除了冷变形组织中大部分腐蚀敏感区域,同时,纳米/超细晶和残留奥氏体中的高密度的低角度晶界具有更强的再钝化能力和耐腐蚀性能,有效抑制亚稳态点蚀坑的扩展。但随着退火时间延长,试样的再结晶程度增加、低角度晶界比例下降,减弱了对亚稳态点蚀坑扩展的抑制作用,导致耐腐蚀性能下降。The 316L austenitic stainless steel with heterogeneous lamella(HL)structure composed of different proportions of recrystallized lamellae,nano/ultrafine lamellae and retained austenite lamellae was obtained by cold rolling with a deformation of 78%and annealing at 750℃for 10 min and 15 min,and its corrosion properties were tested by electrochemical corrosion experiments.The results show that the corrosion resistance of the samples with HL structure is better than that of cold rolled sample.This is mainly attributed to the partial recrystallization during the annealing,which eliminates most of the corrosion sensitive areas in the cold deformed microstructure.Additionally,the high-density low angle grain boundaries in the nano/ultrafine grain and retained austenite have stronger repassivation ability and corrosion resistance,effectively suppressing the expansion of metastable pitting.However,as the annealing time increases,the degree of recrystallization of the sample increases and the proportion of low angle grain boundaries decreases,weakening the inhibitory effect on the expansion of metastable pitting and leading to a decrease in corrosion resistance.

关 键 词：奥氏体不锈钢 层状异质结构 腐蚀行为 亚稳态点蚀 晶界 

分 类 号：TG142.7[一般工业技术—材料科学与工程]