利用激光瞬时加热方法制作300M钢烧伤试样，通过调节不同激光加热功率来获得不同程度的烧伤区域，对不同烧伤区域的试样进行不同厚度的镀铬处理。再对试样进行巴克豪森检测，分析不同厚度镀铬层与巴克豪森信号的关系，总结镀铬层对巴克豪森检测灵敏度的影响。结果表明巴克豪森法可以准确地检测镀铬层下烧伤缺陷，检测灵敏度随着镀层厚度的增加逐渐降低，当厚度超过150 μm时检测灵敏度严重降低。

300M steel thermal damage specimens were manufactured using laser instantaneous heating. Different levels of thermal damage area could be obtained by adjusting the heating power of the laser. Different thicknesses of chrome were applied to plate on different levels of specimens, and then the specimens were tested by using the method based on Barkhausen effect. The relationship between the thickness of chrome plating layer and the Barkhausen signal was analyzed. From the research, this method could accurately detect the thermal damage under the chrome plating layer. And the sensitivity descends as the thickness increases. The sensitivity would descend seriously when the thickness is more than 150 μm.