论文部分内容阅读
在已经过常规淬火的GCr15轴承钢表面,利用脉冲Nd:YAG激光进行了B4C粉末硼化改性处理。采用扫描电子显微镜、X射线衍射仪、显微硬度仪及摩擦磨损试验仪器对激光硼化处理后改性层的显微组织及性能进行了研究。结果表明:激光硼化改性层由树枝晶的FeB、Fe2B和基体组成,改性层的表面硬度高达HV1560,相比处理前硬度提高了81.8%,硬化层深度约为150μm,磨损率相比处理前降低了67.55%,激光硼化后GCr15钢表面的硬度和耐磨性能显著提高。
On the surface of GCr15 bearing steel, which has been conventionally quenched, the B4C powder was modified by pulsed Nd: YAG laser. The microstructure and properties of the modified layer after laser barylation were studied by scanning electron microscopy, X-ray diffraction, microhardness tester and friction and wear testing equipment. The results show that the laser boride modified layer is composed of dendrite FeB, Fe2B and matrix. The surface hardness of the modified layer is up to HV1560, which is 81.8% higher than that before treatment. The depth of the hardened layer is about 150μm. 67.55% reduction before treatment, after laser boriding GCr15 steel surface hardness and wear resistance significantly improved.