YG8硬质合金强流脉冲电子束表面改性层的组织和性能

Microstructure and properties of modified surface of YG8 hard alloy irradiated by high current pulsed electron beam

对YG8硬质合金试样进行强流脉冲电子束(HCPEB)表面辐照处理。利用扫描电镜和X射线衍射方法分析样品表层显微组织结构变化,测量基体及改性样品的表面显微硬度和耐磨性能。结果表明,随着脉冲次数增加,试样表面熔化程度增加,WC晶粒细化,形成了2μm的重熔层。表面改性层形成WC_(1-x)、Co_3W_9C_4相。经25次脉冲处理样品的表面显微硬度增加到2105 HK。磨痕深度较基体降低约86%,磨损率降至17.9 mm^3·min^(-1),约为基体试样的48%。

Surface of YG8 hard alloy was modified by high current pulsed electron beam irradiation.The modified surfaces were characterized with scanning electron microscopy,X-ray diffraction.The surface microhardness and wear resistance of the modified surface and the matrix were measured respectively.The results show that the surface melting degree of the samples becomes severe,as the increasing of the pulsing number.The WC grains were refined drastically,and the thickness of the re-melting layer on the top surface reaches about 2μm.There produce WC（1-x）phase and Co3W9C4phase in the modified surface of the cemented carbide.The sample irradiated with 25 pulses shows the highest microhardness,the wear trace depth decreases by about 86%,and the wear-off rate decreases to 17.9 mm^3·min^-1,which is improved 48%comparing to the non-irradiated samples.