Abstract: The surface of wheel and rail rollers was quenched by laminar plasma, and the pre-cracks were manufactured on the surface of wheel rollers. Based on rolling contact wear tests carried out on the MJP-30 test machine, the effect of pre-cracks on wear behavior of wheel rollers quenched by plasma was studied. The results show that the pre-cracks lead to severe wear zones in the part of untreated wheel rollers, increa-sing the mass loss of untreated rollers significantly, increasing the mass of quenched rollers slightly. The pre-cracks are closed in the untreated wheel rollers after wear. However, they are not closed in the quenched rollers. For the quenched wheel rollers, the width of shallow pre-crack expands with martensite plastic deformation and spalling of the surface, while the width of deep pre-crack shrinks slightly and there is no martensite plastic deformation or spalling of the surface. The pre-crack of quenched rollers induces large angle cracks throughout the quenched zone, and then they propagate along the interface between the quenched zone and the matrix, which significantly increases the block spalling risk of the quenched zone.
李爽, 张青松, 戴光泽. 预制裂纹对等离子体淬火车轮材料磨损行为的影响[J]. 材料导报, 2022, 36(5): 20120250-7.
LI Shuang, ZHANG Qingsong, DAI Guangze. Effect of Pre-cracks on Wear Behavior of Railway Wheel Material Quenched by Plasma. Materials Reports, 2022, 36(5): 20120250-7.
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