模具钢SKD11强流脉冲电子束表面处理的形貌研究  

Morphologies of Mold Steel SKD11 Surfaces Modified by High Current Pulsed Electron Beam Irradiation

作　　者：吴平生[1] 郝胜智[2] 李旻才[1] 宋振飞[2] 董闯[1,2] 

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024 [2]大连理工大学三束材料改性国家重点实验室,辽宁大连116024

出　　处：《真空科学与技术学报》2008年第6期511-515,共5页Chinese Journal of Vacuum Science and Technology

基　　金：国家高技术研究发展863计划项目(No.2006AA03Z110)资助

摘　　要：利用强流脉冲电子束不同工艺参数对模具钢SKD11进行表面处理,发现处理表面出现典型的熔坑形貌。通过金相显微镜、电子探针成分分析、三维形貌轮廓仪对处理样品表面进行分析,模具钢SKD11亚表层碳化物的喷发是熔坑形成的主要原因。熔坑的分布情况与电子束处理工艺参数密切相关。在相同加速电压下,熔坑面密度随脉冲处理次数的增加而减少,而熔坑平均尺寸呈现先随脉冲次数增加到最大值而后减小的趋势;对于相同处理次数时,使用高加速电压的样品表面形成的熔坑面密度较低,而且要比低电压更快地进入到平稳阶段。表面粗糙度呈现随着脉冲次数的增加而降低的现象。The mold steel SKDll surfaces were modified by high current pulsed electron beam （HCPEB） irradiation. The surface morphologies were characterized with scanning electron microscope （SEM）, metallographic microscope, and profilometer. The results show that HCPEB irradiation significantly modifies the surface morphology of the mold steel SKDll ,and that the surface modification conditions matter. For instance, at the same accelerating voltage, as the pulse number increases, both the surface crater density and the surface roughness decrease; whereas the averaged diameter of craters first increases to a peak, and then decreases. At a given pulse number, the higher the accelerating voltage, the lower the crater density. We propose that carbide eruptions underneath the surface, originated from HCPEB irradiation, create the craters commonly observed.

关 键 词：强流脉冲电子束 熔坑 粗糙度 

分 类 号：TG178[金属学及工艺—金属表面处理]