40CrNiMoA钢扫描电子束表面抛光改性的研究  

Study on Surface Modification of 40CrNiMoA Steel by Scanning Electron Beam

作　　者：王荣[1] 孟城功 魏德强[1] 俞杰 姜红飞 WANG Rong;MENG Chenggong;WEI Deqiang;YU Jie;JIANG Hongfei(School of Mechanical and Electrical Engineering,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]桂林电子科技大学机电工程学院,广西桂林541004

出　　处：《热加工工艺》2021年第16期75-80,共6页Hot Working Technology

基　　金：国家自然科学基金项目(51665009);广西自然科学基金项目(2017GXNSFDA198007)。

摘　　要：为改善40CrNiMoA合金钢的表面性能,对其表面进行扫描电子束抛光改性处理。研究了电子束工艺参数对40CrNiMoA钢表面性能的影响。结果表明:扫描电子束处理后,总体形貌由熔融区、热影响区和基体组成,且显微硬度随着距表面距离的增加,呈先增加后降低的趋势。熔融区的微观组织主要由晶粒粗大的马氏体组成;热影响区的微观组织主要由细小的马氏体组成;基体的微观组织主要为回火索氏体。经扫描电子束处理后,材料表面粗糙度随扫描电子束束流的增大先降低后升高,表面粗糙度最低值为0.889μm;随扫描速度的增大,材料表面粗糙度先升高后降低,最低值为0.708μm。改性层深度随扫描电子束束流的增大而不断增大,随扫描电子束移动速度的增大而逐渐减小。In order to improve the surface properties of 40 CrNiMoA alloy steel, scanning electron beam surface modification was carried out.The influences of electron beam technology parameters on the surface properties of 40 CrNiMoA steel were studied. The results show that the morphology is composed of melt zone, heat-affected zone and matrix, and the microhardness increases first and then decreases as the distance from the surface increases. The microstructure of the molten zone is mainly composed of martensite with large grain size. The microstructure of the heat-affected zone is mainly composed of small size martensite. The microstructure of the matrix is mainly tempered sorbite. After the scanning electron beam treatment, the surface roughness of the material decreases first and then increases with the increase of the scanning electron beam current. The surface roughness has a minimum value of 0.889 μm, which increases first and then decreases with the increase of scanning speed, and the minimum value is 0.708 μm. The depth of modified layer increases with the increase of scanning electron beam currents and decreases with the increase of scanning electron beam moving speeds.

关 键 词：扫描电子束 表面抛光 显微硬度 表面粗糙度 

分 类 号：TG439.3[金属学及工艺—焊接]