Influence of tempering treatment on microstructure and pitting corrosion of 13 wt.% Cr martensitic stainless steel
Influence of tempering treatment on microstructure and pitting corrosion of 13 wt.% Cr martensitic stainless steel
复制标题
DOI：
10.1016/j.corsci.2017.12.012
复制
发表时间：
2018-02-01
影响因子：
8.3
通讯作者：
Kain, Vivekanand
中科院分区：
文献类型：
--
作者：
Bonagani, Sunil Kumar;Bathula, Vishwanadh;Kain, Vivekanand
回火13重量% Cr马氏体不锈钢在300 ℃下产生纳米尺寸的M3 C碳化物，在550 ℃下产生纳米尺寸的富Cr M23 C6碳化物，在700 ℃下产生亚微米尺寸的富Cr M23 C6碳化物。奥氏体化导致板条马氏体与未溶解的M23 C6碳化物。回火条件的耐点蚀性低于在550 ℃下具有最小电阻的回火条件。该观察结果归因于在550 ℃回火条件下在碳化物界面处存在富Fe表面膜和大量碳化物沉淀，其中Cr耗尽区为7-9 nm，这与结晶化条件下的富Cr钝化膜相反。
Tempering of 13 wt.% Cr martensitic stainless steel resulted in nano-sized M3C carbides at 300 degrees C, nano-sized Crrich M23C6 carbides at 550 degrees C and sub-micron sized Cr-rich M23C6 carbides at 700 degrees C. Austenitization resulted in lath martensite with undissolved M23C6 carbides. Pitting resistance for tempered condition was lower than the austenitized condition with least resistance at 550 degrees C. The observation was attributed to the presence of a Fe-rich surface film and massive carbide precipitation with a Cr depletion zone of 7-9 nm at carbide interface for 550 degrees C tempered condition as opposed to a Cr-enriched passive film for the austenitized condition.