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通过脉冲等离子体爆炸工艺对Cr12Mo V钢表面进行改性处理。利用光学显微镜、扫描电镜、能谱仪和X射线衍射分析了改性层的显微组织、元素分布和物相,并用显微硬度计测试不同区域的微观硬度。结果表明,脉冲等离子体爆炸处理后可得到熔凝区和硬化层两层组织,熔凝区和硬化层分别由柱状晶与细晶区组成,并且熔凝区产生元素注入现象。随着脉冲次数的增加,表面粗糙度先降低后升高,处理次数为5时,Ra=13.98μm。硬度从表面到基体呈现先升高后降低的趋势且硬化层的硬度较基体显著提高。改性层硬度随处理次数的增加而增加,但增加的趋势有所减缓。
The surface of Cr12Mo V steel was modified by pulsed plasma explosion process. The microstructure, elemental distribution and phase of the modified layer were analyzed by optical microscope, scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The microhardness of the modified layer was measured by microhardness tester. The results show that two layers of the fusion zone and the hardened layer can be obtained after the pulsed plasma explosion treatment. The fused zone and the hardened zone are composed of columnar grains and fine grain regions, respectively, and elemental injection occurs in the fused zone. With the increase of pulse times, the surface roughness first decreased and then increased. When the number of processing was 5, Ra = 13.98μm. Hardness from the surface to the substrate showed the first increase and then reduce the trend and the hardened layer hardness significantly higher than the substrate. The hardness of the modified layer increased with the increase of the number of treatments, but the trend of increase slowed down.