强流脉冲离子束辐照W6Mo5Cr4V2高速钢表面改性研究  

SURFACE MODIFICATION OF W6Mo5Cr4V2 HIGH- SPEED STEEL BY HIGH-INTENSITY PULSED ION BEAM

作　　者：梅显秀[1] 马腾才[1] 王秀敏[2] 徐卫平[2] 宋美丽[2] 

机构地区：[1]大连理工大学三束材料改性国家重点联合实验室,大连116024 [2]大连理工大学材料工程系,大连116024

出　　处：《金属学报》2003年第9期926-931,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金资助项目19835030

摘　　要：利用强流脉冲离子束(HIPIB)技术对W6Mo5Cr4V2高速钢进行表面辐照处理.HIPIB主要由Cn+(70％)和H+(30％)组成,束流密度为160 A/cm2,加速电压为250 kV,脉冲宽度为80-100 ns,能流密度为3-4 J/cm2,脉冲次数分别为1,3和5次.利用XRD,SEM和EPMA研究了HIPIB辐照处理前后该高速钢表面层结构和成分的变化,结果表明,HIPIB辐照处理使该高速钢表面层发生由马氏体α’-Fe向奥氏体γ-Fe转变,其表面产生许多火山口状熔坑,熔坑中心处富含离子束元素成分,熔坑的形成可以用“雨滴”模型进行解释.由于HIPIB辐照压缩波的影响,处理后在深度达200μm左右的范围内该高速钢的显微硬度提高,表面层耐磨性能提高近2倍,而且耐腐蚀性能也有所提高.The surface of W6Mo5Cr4V2 high-speed steel (HSS) was treated by high Intensity pulsed ion beam (HIPIB) for 1, 3 and 5 pulses, which consists mainly of Cn+ (70%) and H+ (30%). The bombarded conditions are as follows: a high beam current density of 160 A/cm(2), acceleration voltage of 250 kV, pulse duration of 80-100 ns, energy density of 3-4 J/cm(2). The structure and composition changes of the HSS before and after irradiation were analyzed by using XRD, SEM and EPMA. The results show that the initial martensite in the surface layer is changed into austenite, and craters are formed on the surface. The crater formation is explained using the raindrop model, supported by the enriched elements from the beam near the center. Due to the compress stress wave induced by the bombardment, the microhardness is significantly increased in a depth range of up to 200 mum. The wear resistance is improved by a factor of 2, and the corrosion resistance is also slightly increased.

关 键 词：强流脉冲离子束 高速钢 表面改性 

分 类 号：TG142.45[一般工业技术—材料科学与工程] TG113.2[金属学及工艺—金属材料]