论文部分内容阅读
对U71Mn K钢轨焊缝及母材在滚动接触疲劳条件下进行模拟试验,对比研究了钢轨焊缝及母材在滚动接触过程中的材料磨损演变行为.结果表明:以U71Mn K为基材的钢轨焊缝部位与非焊缝部位的磨损性能及组织结构在磨损前后均存在显著差异.由于组织结构和力学性能的差异,焊缝区硬度低于非焊缝区,焊缝区摩擦系数、磨损量、磨损率均大于非焊缝区.与非焊缝区相比,钢轨焊缝区容易产生犁沟乃至波磨,表面粗糙度增大,剥落损伤、裂纹、塑性变形严重,磨损性能变坏.无论焊缝区还是非焊缝区,其先前的磨损细化了组织,改善了其磨损性能,减弱了其后的摩擦损伤.
The simulation experiments of the weld and the base metal of U71Mn K rail under the condition of rolling contact fatigue were carried out to study the material wear evolution behavior of the rail seam and the base metal during the rolling contact.The results show that the rail with U71Mn K as the base material The wear performance and the microstructure of the welded part and the non-welded part have significant differences before and after wear.Due to the difference of the microstructure and mechanical properties, the hardness of the weld zone is lower than the non-weld zone, the friction coefficient of the weld zone, the wear amount , The wear rate is greater than the non-weld zone.Compared with the non-weld zone, the rail weld zone prone to furrow or even grinding, surface roughness increases, spalling damage, cracks, plastic deformation serious wear performance deterioration. The previous wear-and-tear refinement of both the weld zone and the non-weld zone improves the wear properties and the subsequent frictional damage.