表面超声滚压对D2车轮钢磨损性能的影响

Effect of Surface Ultrasonic Rolling Process on Wear Performance of D2 Wheel Steel

研究表面超声滚压处理对D2车轮钢表层组织及滚动磨损性能的影响,为轨道交通关键材料设计和寿命提供理论和实验依据。对D2车轮钢进行表面超声滚压处理,对比处理前后的两种试样的表面粗糙度,观察两种样品截面的金相组织,对样品表面和截面进行硬度测量。对两种试样进行2×104r磨损实验,重复上述分析方法,比较两种试样的磨损性能并进行分析。结果表明:D2车轮钢经过表面超声滚压处理后表面粗糙度明显降低,表层会出现明显的硬化层,晶粒发生细化。磨损实验后,经表面超声滚压处理后的D2车轮钢摩擦系数较小,在0.5×104r内抗磨损性能得到提升,表层组织发生更剧烈的塑性变形,产生更厚的塑性变形层。

The effects of surface ultrasonic rolling technology on the microstructure and rolling wear properties of D2 wheel steel were studied, which can provide theoretical and experimental basis for the design of key materials and life for rail transit.The surface ultrasonic rolling process was carried out on D2 wheel steel. The surface roughness of the two samples before and after treatment was compared, and the metallographic structure of the cross sections of the two samples was observed, and the hardness of surface and cross section of the sample was measured. The 2×104 r abrasion test was performed on the two samples, and the above analysis methods were repeated to compare the wear properties of the two samples. The results show that after the surface ultrasonic rolling of D2 wheel steel, the surface roughness obviously reduces, and the hard layer appears on the surface layer, and the grain is refined. After the abrasion test, the friction coefficient of D2 wheel steel after surface ultrasonic rolling treatment is small, the wear resistance improves in 0.5 ×104 r, the surface structure generates more severe plastic deformation, and a thicker plastic deformation layer appears.