不同冷却方式对ZG35Cr2NiMoVTi钢硬韧性与冲击磨料磨损性能的影响

Influence of different cooling methods on mechanical properties and impact-abrasion behavior of ZG35Cr2NiMoVTi steel

通过显微组织观察、力学性能测试研究了不同冷却方式对热处理后ZG35Cr2NiMoVTi铸钢的组织及力学性能的影响,并与高锰钢(Mn13)进行了比较。结果表明,ZG35Cr2NiMoVTi钢炉冷组织为少量铁素体+珠光体,空冷、风冷组织为少量铁素体+珠光体+贝氏体,油淬、水淬组织为板条马氏体+少量残留奥氏体;其硬度随冷速提高而增加,水淬后硬度达最高值52 HRC;冲击韧性随冷速提高先增加后下降,风冷时最佳,油淬、水淬时较低。在冲击功为4.5 J的冲击磨料磨损条件下,其耐磨性随着硬韧性的增加而提高,炉冷最差,空冷、风冷后逐渐提高,油淬、水淬时较好;油淬、水淬时的耐磨性已优于高锰钢(Mn13)。

Effects of different cooling methods in heat treatment on mierostructure, mechanical property of the steel ZG35Cr2NiMoVTi were investigated by means of microstructure observation, mechanical property test, and compared with the high manganese steel （Mnl3）. The results show that the microstructure of the ZG35Cr2NiMoVTi steel is composed of a few ferrite and pearlite after furnace cooling, a few ferrite, pearlite and bainite after air cooling and wind cooling, and composed of lath martensite and a few residual austenite after oil quenching and water quenching, respectively. The hardness of the steel is improved by increasing the cooling rate and the largest hardness of 52 HRC is obtained after water quenching. Its impact toughness first increases and then decreases with increasing the cooling rate, and the best impact toughness is obtained after wind cooling. As the impact work of 4.5 J is applied in the impact-abrasive wear test, the impact-abrasive wear resistance of the steel increases with increase of hardness and toughness. The impact-abrasive wear resistance of the steel after furnace cooling is the poorest comparing to that of the others, and increases in turn after air cooling and wind cooling. The impact-abrasive wear resistance of the ZG35Cr2NiMoVTi steel is improved significantly after oil quenching and water quenching,and it is superior to that of the high manganese steel （Mnl3）.