强流脉冲电子束40CrNiMo7钢表面合金化

Surface Modification of 40CrNiMo7 Steel by High Current Pulsed Electron Beam

使用强流脉冲电子束(HCPEB)对40CrNiMo7钢的表面进行合金化。使用金相显微镜、X射线衍射(XRD)、电子探针(EPMA)方法分析表层形貌和组织变化规律,测试改性表面的显微硬度。得出,重熔层内碳元素含量的平均值要比铁素体碳元素含量的平均值高78%,表面合金化效果较好,目的实现。对应表面预先HCPEB脉冲处理的样品,再将其进行合金化处理后,硬度提高十分明显,达到355HV。在使用HCPEB进行表面合金化处理工艺时,对样品的预处理是必要步骤,从而可以使得表面进行合金化前,其成分差异较少,组织较为均匀,熔坑喷发的诱因数量因而减少。

Surface alloying of 40CrNiMo7 steel was carried out by high current pulsed electron beam（HCPEB） technique. The microstructure and phase state in modified surface layer were observed by optical microscopy,X-ray diffraction methods and EPMA technique. Test the modified surface microhardness. The results show that the carbon content in the surface remelting layer is ferrite increased by 78%, the surface alloying purpose has been achieved. Use HCPEB 40 crnimo7 alloying processing samples, the average microhardness on the surface of the original sample it possesses much higher than initial state of microhardness, reach 355 HV.Using surface alloying HCPEB） for the pretreatment of the sample is a necessary step, composition and organization can make the surface organization is relatively uniform, reduce melting pit eruption of adverse factors.