【摘要】 研究了不同冲击功对8Mn-2Cr-Si钢磨粒磨损性能的影响,利用X射线衍射仪分析了试样冲击表面的组织相变过程,并利用扫描电子显微镜对材料磨损表面及亚表层进行分析,探讨其磨损机制.结果表明:8Mn-2Cr-Si钢在冲击磨损过程中,冲击诱发马氏体相变,且冲击功越大,马氏体相变量越多,材料加工硬化效果越好;但随着冲击功的增大,材料磨损失重增多,主要是由于不同冲击功条件下磨损机制不同,并且材料塑性变形阶段使磨粒嵌入基体,成为应力集中源,在循环冲击过程中产生疲劳裂纹,逐渐扩展至材料表面,最终形成大块剥落使材料严重磨损失效.更多还原

【Abstract】 The abrasive-wear properties of 8 Mn-2 Cr-Si steel were tested under different impact energy conditions. XRD( X-ray diffractometer) was used to investigate the structural transformation of the impacted wear surface,and SEM( scanning electron microscope) was used to investigate the morphology of wear surface and subsurface in order to study wear mechanism. The results show that impact-induced martensite phase transformation occurs during the wear. With the impact energy growing,the amount of martensite transformation increases,the work hardening effect improves and the wear loss increases. The reason is the wear mechanisms are different under different impact energy conditions. Besides,the grains embedded in the substrate during the plastic deformation will become sources of stress concentration. Thus the fatigue cracks will grow and propagate to the wear surface gradually under the circulation impact,causing large impactflaking,finally making the material failure.更多还原