马氏体不锈钢堆焊层组织和耐冲蚀性能

采用2Cr13和经过V、Ti、Nb、N微合金化改性处理的1Cr13马氏体不锈钢进行埋弧堆焊试验,分析微合金元素和热处理工艺对马氏体不锈钢堆焊层显微组织和耐冲蚀性能的影响。研究结果表明:微合金元素V、Ti、Nb与C、N在奥氏体形核初期形成大量颗粒细小、弥散分布的稳定化合物,使堆焊层金属的晶粒得到细化;奥氏体晶粒稳定后,这些化合物又起到析出强化的作用;回火后,部分碳化合物在马氏体板条间析出,起到了二次强化的作用,同时降低马氏体中的碳含量,改善基体韧性。较好的基体强韧性配合最终提高了材料的耐冲蚀性。

Research on the deposited metal microstructure and erosion-resistance of martensitic stainless steel

By using martensitic stainless steel 2Cr13 and improved 1Cr13 which alloyed V、Ti、Nb、N to building-up,influence of microalloy elements and heat treatment on microstructure and erosion-resistance of martensitic stainless steel deposited metal were analyzed.The results showed that grain of deposited metal was found because large amount of small dispersed stable chemical compounds were formed by microalloy elements V,Ti,Nb with carbon/nitrogen in early stage of austenite nucleation.After austenitic grains were solidified,precipitation strengthening was involved.This kind of strengthening was enhanced because part of carbide precipitated from martensite laths after tempering,at same time martensite toughness was improved as carbon in martensite decreased.Ultimately high strength and fine toughness were gained for deposited metal.