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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。
M50 steel was modified by high-intensity pulsed electron beam at different energy densities to study the surface morphology, hardness and phase composition of the modified layer under different irradiation energies. The results show that the surface of M50 steel is melted by electron beam modification, which leads to the formation of volcano-like defects and the increase of surface roughness. The grain size of the remelted layer was obviously refined after electron beam irradiation. With the increase of irradiation energy density, the content of retained austenite gradually increased and the hardness of the surface layer decreased gradually. Due to the dissolution of carbides, the corrosion resistance of the material is increased.