Effect of carbon content on abrasive impact wear behavior of cr-si-mn low alloy wear resistant cast steels

Abstract

The effects of carbon contents on microstructure evolution and mechanical properties, including hardness, impact toughness and abrasive impact wear resistance behavior, were investigated for Cr-Si-Mn low alloy cast steels. The results showed that, with the increase of carbon content in the steels, the metallographic structure transformed from lath martensite to acicular martensite gradually. Correspondingly, the hardness increased and impact toughness decreased distinctly due to the increasing of carbon supersaturation and refinement of martensite. Furthermore, the wear resistant increased firstly and then decreased, which can be ascribed to the changing of wear mechanism from plastic fatigue wear to brittle fracture wear.