为了改善高速钢M2的表面强度和耐蚀性能,利用强流脉冲电子束(HCPEB)对高速钢M2进行了表面改性处理,辐照次数分别为1,3,5,7,9次.采用扫描电子显微镜、显微硬度计、能谱仪和盐雾腐蚀试验机测试辐照前后试样表面形貌、硬度、元素分布和耐蚀性能,并分析变化规律.结果表明:强流脉冲电子束辐照处理使高速钢表面极速加热又快速冷却,产生表面淬火作用,导致碳化物溶解,马氏体溶碳量增大,试样表面的显微硬度提高,出现表面光滑化,表面层晶粒细化,改善了耐腐蚀性能.
In order to improve hardness and corrosion-resistance of high-speed steel M2, it's surface was treated by high current pulsed electron beam( HCPEB). Pulse numbers were 1,3,5,7 and 9. The surface morphologies were an-alyzed with scanning electron microscopy(SEM), surface micro-hardness of specimens were measured by Vickers micro-hardness testers, EDS was used to test the distribution of elements and the corrosion resistance was tested by the salt spray corrosion machine. The results showed that after irradiation treatment, parts of the carbides in the surface layer dis-solved which induced the carbon content in martensite increased. The micro-hardness was increased due to the compress stress wave induced by the bombardment. The HCPEB irradiation can smooth the surface, reduce the grain size and im-proved corrosion resistance.
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