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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)。
The effects of different cooling methods on the microstructure and mechanical properties of ZG35Cr2NiMoVTi cast steel after heat treatment were investigated by microstructure observation and mechanical property test, and compared with high manganese steel (Mn13). The results show that the cold-rolled ZG35Cr2NiMoVTi furnace is a small amount of ferrite + pearlite, air-cooled, air-cooled microstructure of a small amount of ferrite + pearlite + bainite, oil quenching, water quenched tissue lath martensite + a small amount of residual Austenite. The hardness increases with the increase of cooling rate, and reaches the highest hardness of 52 HRC after water quenching. The impact toughness increases first and then decreases with the increase of cooling rate, and is best when air-cooled. Under the impact abrasion condition with impact energy of 4.5 J, the wear resistance increases with the increase of hardness and toughness. The furnace cooling is the worst, air cooling and air cooling is gradually increasing, while the oil quenching and water quenching are better. Oil quenching , The wear resistance of water quenching has been better than high manganese steel (Mn13).