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研究了常规淬火工艺和亚温淬火工艺对30Cr Mn Si钢硬度和冲击性能的影响,并对显微组织进行了分析。结果表明,常规淬火后,30Cr Mn Si钢显微组织是板条马氏体+残留奥氏体;亚温淬火后,显微组织是细小的板条马氏体+铁素体+残留奥氏体。随着回火温度的升高,两种工艺淬火后的硬度均逐渐降低;常规淬火后的冲击性能曲线呈现“W”状,而亚温淬火后的冲击性能则随着回火温度的升高而增加。亚温淬火工艺能得到最佳的硬度和韧性配合。
The effects of conventional quenching process and sub-temperature quenching process on the hardness and impact properties of 30Cr Mn Si steel were studied, and the microstructure was analyzed. The results show that the microstructure of 30Cr Mn Si steel is lath martensite + retained austenite after conventional quenching. Microstructure after the sub-temperature quenching is fine lath martensite + ferrite + residual austenite body. With the increase of tempering temperature, the hardness of the two kinds of technology are gradually decreased after quenching; the impact performance curve of conventional quenching shows “W ” shape, while the impact performance after sub-tempered quenching with the tempering temperature Increase and increase. Sub-temperature quenching process can get the best hardness and toughness with.