Initial wear characteristics of aging‐treated ZG120Mn13 steel under steel shot at high‐velocity impact

Abstract

AbstractThe initial wear of high manganese steel parts in practical use is related to their original hardness, external loading, surface machining accuracy, and the change of shape and dimension. The paper studies the size and coverage percentage of impact scars on the ZG120Mn13 high carbon high manganese steel surface, as well as the variation of weight loss under high‐velocity steel shot by changing aging treatment process. Meanwhile, the relationship between the hardness of aging ZG120Mn13 steel and its initial wear characteristics is discussed. The results show that after 5 seconds, the size and coverage percentage decreased with the increment of hardness. However, in any different period, the wear mass losses of the steel increase with increment of hardness, and increase rapidly first, then slowly. Therefore, under high‐velocity impact loading, the increment of hardness is beneficial to improving initial wear‐resistance from the perspective of the deformation, but is conducive to improving the resistance from the mass loss. Consequently, we should not only emphasize the high hardness merely, but also consider the changing law of weight loss and initial deformation comprehensively, so that we can achieve the best initial wear resistance when the high manganese steel has the appropriate hardness.