Abstract: The abrasive-wear properties of 8Mn-2Cr-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 impact-flaking， finally making the material failure.

Key words: 8Mn-2Cr-Si steel, impact energy, abrasive wear, wear mechanism, martensitic transformation