Abstract
Quenching is a conventional production process of wear-resistant steel, which has a decisive effect on the properties of wear-resistant steel. In this paper, the effects of quenching treatment on microstructures and mechanical properties of NM450 wear-resistant steel were investigated by optical microscopy and scanning electric microscopy. The results show that during the process of heating temperature of 880 °C and air cooling to 850 °C before quenching, the ductility and toughness of NM450 were improved significantly, whose comprehensive properties are better than 880 °C or 850 °C direct quenching steel. With the proportion of ferrite increasing, the strength of NM450 decreases, but the toughness doesn`t increase as influenced by grain size and grain boundary segregation. The martensite of intercritical quenching NM450 appears a shape massive, not lath.
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