New Martensitic Steel Impact Abrasive Wear Performance And Wear Mechanism

The impact abrasive wear resistance of new-style martensitic steel ADVANS450W and ADVANS600W was investigated on MLD-10 type impact abrasive wear tester in 0.5J,1.5J and 3.5J impact energy, and the experimental results of the two martensitic steels were compared with that of Hadfield manganese steel. That hardness and impact energy has an effect on weight loss and relative wear resistance of martensitic steel, which was investigated. Morphologies of worn surface were observed by scanning electron microscopy, and abrasive wear mechanisms corresponding with morphologies were analysed. Sub-surface hardness in different impact energy was measured, and compared with no pre-impact matrix hardness, that impact energy has an effect on sub-surface hardness was analysed. Morphologies of worn sub-surface were observed in different impact energy by scanning electron microscopy, that hardness and impact energy has an effect on quantity and depth of abrasive-embedding in worn sub-surface, which was investigated. That wear mechanisms vary with hardness and impact energy was investigated.The results show that, weight loss of two martensitic steels is less than that of Hadfield manganese steel, and weight loss of steel ADVANS600W is less than that of steel ADVANS450W, namely weight loss of materials decreases with increasing hardness. Trends of weight loss changing with increasing impact energy is, first increasing then decreasing. The greatest weight loss is obtained in 1.5J impact energy. Changes in weight loss with changing impact energy exist a turning point, rather than monotonous. Impact abrasive wear resistance of two martensitic steel in different impact energy is better than Hadfield manganese steel, and relative wear resistance of ADVANS600W is better than ADVANS450W, namely relative wear resistance of materials improves with increasing hardness. Changes of two martensitic steels in relative wear resistance decrease with increasing impact energy.Morphologies of worn surface of two martensitic steels include abrasive embedding area, plastic fatigue area and plough-cutting area, and wear mechanisms include plastic fatigue and plough-cutting. Because of work-hardening, sub-surface hardness increases with increasing impact energy. Quantity of abrasive-embedding and micro-cracks decreases, depth of abrasive-embedding shallows, with increasing sub-surface hardness. Quantity of abrasive-embedding and micro-cracks increases, depth of abrasive-embedding deepens, with increasing impact energy.Plough-cutting mechanism increases, plastic fatigue mechanism decreases, with increasing hardness of martensitic steels. Plough-cutting mechanism decreases, plastic fatigue mechanism increases, with increasing impact energy.