【摘要】 利用电子束进行表面热改性处理是材料表面处理中的一种新兴技术。本文利用强流脉冲电子束 (Highcurrentpulsedelectronbeam ,HCPEB)技术对模具钢D2 (Cr12Mo1V1)和模具钢H13(4Cr5MoSiV1)进行了表面改性处理。对改性试样进行了表面形貌及组织结构分析 ,并进行了显微硬度及磨损性能测试 ,结果表明 ,电子束轰击处理后试样的最表层发生熔化 ,晶粒明显细化 ,表面重熔层厚度最厚处达到了 10 μm左右。试样次表层几百微米范围内都存在显微硬度增加现象 ,并呈现特殊的曲线分布状态。试样相对耐磨性也分别提高了 5 .6 3倍 (D2 )和 11.76倍 (H13)。更多还原

【Abstract】 A new surface modification technology-high current pulsed electron beam treatment method was applied to the surface of die steel to improve its properties. It has been shown that as a result of the HCPEB treatment, the most pronounced changes of the structure-phase state occur in the near-surface layers quenched from the liquid state, where the crystallization front velocity reaches its maximum. In these layers partial or complete dissolving of second phases and formation of over saturated solid solutions and ordered nanosized structures may take place. This makes it possible to improve substantially the electrochemical and strength properties of the surface layers. We found that the thickness of remelt layer is about 10μm, and the sectional microhardness increased accompanied by the enhancement of the wear resistance of the material. After modification, the relative wear resistance of D2 steel have inereased 5.63 times and that of H13 steel increased 11.76 times.更多还原