SKD11模具钢的强流脉冲电子束辐照改性  

Surface modification of mold steel SKD11 by high current pulsed electron beam

作　　者：郝胜智[1] 李旻才[1] 张向东[1,2] Thierry Grosdidier 董闯[1] 

机构地区：[1]大连理工大学三束材料改性重点实验室,大连116024 [2]法国梅兹大学材料织构研究与应用实验室,梅兹57054

出　　处：《核技术》2009年第3期214-216,共3页Nuclear Techniques

基　　金：国家高技术研究发展“863”计划项目(2006AA03Z110)资助

摘　　要：本文介绍强流脉冲电子束(HCPEB)材料表面改性原理,采用模具钢SKD11进行辐照处理实验。对处理样品表面进行形貌观察,发现熔坑面密度及粗糙度随脉冲处理次数的增加而减小。X射线衍射分析证实,多脉冲处理条件下表面改性层中碳化物发生溶解,形成高奥氏体含量的重熔组织,而过多的能量注入会使奥氏体发生再度分解。磨损性能测试表明,在低电压(19.8kV)处理情况下,耐磨损性能得到改善,脉冲次数为8次时处理样品的耐磨性达到最佳,这与表面改性层中碳化物及奥氏体的相对含量变化密切相关。Mechanism of surface modification technique by high current pulsed electron beam （HCPEB） was studied with SKDll steel samples. It was found that crater-like defects would formed on the irradiated surface, the area density of craters and surface roughness decreased with the increasing number of HCPEB pulses. According to the XRD patterns, carbides in the modified surface layers dissolved after several HCPEB pulses and a high-percentage austenite microstructure is formed, but excessive energy deposition resulted in decomposition of the austenite. Treating the samples at 19.8 kV, the wear resistance of modified SKD11 steel improved and the greatest enhancement occurred at 8 pulses. Discussions were given on changes in contents of carbide and austenite in the surface layers.

关 键 词：强流脉冲电子束 熔坑 粗糙度 显微结构 耐磨性 

分 类 号：TG178[金属学及工艺—金属表面处理]