摘要
采用极化曲线法研究了析出相对时效6Mo超级奥氏体不锈钢在3.5%Na Cl溶液中腐蚀性能的影响。分别在600-1000℃时效1 h和10 h来形成析出相,借助光学显微镜（OM）、透射电镜（TEM）、扫描电镜（SEM）和能谱仪（EDS）表征其显微组织。结果表明：随着时效温度的升高,析出相数量先增多后减少。时效温度和时间对钝化膜破裂电位影响不大,然而维钝电流密度随着时效温度、时间的增加先增大后减小。900℃时效试样表现出最大的电流密度。时效后晶界析出的M（23）C6和σ相是导致6Mo钢耐腐蚀下降的主要原因。
The influence of the precipitated phases on the corrosion property of aged 6 Mo super austenitic stainless steel in 3. 5% Na Cl solution was studied by potentiodynamic scanning. To form the secondary phases the alloy was aged in the temperature range of 600-1000 ℃for 1 h and 10 h. The microstructure of the alloy was observed by means of optical microscopy（ OM）,transmission electron microscopy（TEM）,scanning electron microscopy（SEM） with energy dispersive spectrometer（EDS）. The results show that the amount of precipitates increases first with aging temperature increasing,and then reduces with the further increase of the aging temperature. Aging temperature and hold time have no significant effect on the passivation film break potential,whereas current density increases first,and then decreases with increasing aging temperature and extending aging time. The specimen aged at 900 ℃ shows the maximum current density. The reduction in the corrosion resistance for the steel after aging treatment is ascribed to the precipitation of σ phase and M（23）C6 on grain boundaries.
作者
沈文兴
陈海涛
郎宇平
浦恩祥
周晓玲
Shen Wenxing;Chen Haitao;Lang Yuping;Pu Enxiang;Zhou Xiaoling(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;Institute for Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China;School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第7期115-120,共6页
Heat Treatment of Metals
基金
国家重点研发计划(2016YFB0300202)
