激光束辐照下镀铬层结构和性能的变化

Transformation of Chromium-plating's Structure and Properties After Irradiation by Laser Beam

采用正交实验方法对镀铬轴套进行激光辐照处理，并对处理后的镀铬层进行显微硬度测试和X射线行射（XRD）分析，考察镀铬层结构和性能的变化。结果发现，当激光辐照能量密度E小于12J·mm-2时，镀铬层硬度在HV800～1000的范围内，镀层耐磨性最好；一旦E超过12J·mm-2，镀层硬度陡降。

The chromium plating neck bushes are irradiated by the laser in orthoganalexperiment. In order to inspect the transformation of the chromiun-plating's structureand properties,the micro hardness testing and X-ray diffraction(XRD) testing are madeafter the laser treating. The influence of the laser surface treatment on the chromiumplating's structure and properties are studied. The results show that when radiation energy density of laser beam E is less than 12 J ·mm-2,the hardness of chromium-platingswili be in the range of HV800~1000; when E>12 J ·mm-2, the hardness of chromium-platings will decrease sharply.