M50钢强流脉冲电子束表面改性层的结构与性能  

Microstructure and properties of surface modified layer for M50 steel by high current pulsed electron beam

作　　者：唐光泽[1] 徐芳君[2] 马欣新[3] 

机构地区：[1]哈尔滨工业大学金属精密热加工国防科技重点实验室,黑龙江哈尔滨150001 [2]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001 [3]哈尔滨工业大学现代焊接生产技术国家重点实验室,黑龙江哈尔滨150001

出　　处：《金属热处理》2010年第7期62-65,共4页Heat Treatment of Metals

基　　金：国家973项目(2007CB607602)

摘　　要：采用强流脉冲电子束技术在不同的能量密度下对M50钢进行表面改性处理,研究不同辐照能量下改性层的表面形貌、硬度及相组成。结果表明,M50钢表面经过电子束改性处理后表层发生熔化,形成了类似火山坑的缺陷,表面粗糙度上升。经过电子束辐照后,重熔层的晶粒明显细化,随着辐照能量密度的增加,残留奥氏体含量逐渐上升,表层的硬度逐渐下降。由于碳化物的溶解,材料的耐腐蚀性能上升。Surface modification of M50 steel was performed by using high current pulsed electron beam with various energy density,and the surface morphology,hardness and phase composition of modified layer at different irradiated energy were studied.The results show that the surface of M50 steel is melted under irradiation and it forms defect of crater-like morphology,which leads to an increasing of roughness.The grains are refined obviously in the melted layer after irradiation.The content of retained austenite increases with the increase of the irradiation energy density,resulting the decrease of surface hardness.The corrosion resistance of the irradiated sample enhance because of solution of carbides.

关 键 词：M50钢 强流脉冲电子束 表面改性 辐照 耐蚀性 

分 类 号：TG156.8[金属学及工艺—热处理]