本文根据对30CrMnSiA钢进行亚温淬火的试验结果,确定了该钢的最佳亚温淬火温度,分析了亚温淬火抑制该钢回火脆性的原因,探讨了强韧化机理。试验结果表明,非平衡组织经中等速度加热的亚温淬火工艺可以抑制该钢的回火脆性;原始组织为调质态时,在强度相同的情况下,亚温淬火可使钢的冲击韧性比完全淬火的提高50%左右。 Based on the test results of sub-temperature quenching of 30CrMnSiA steel, the optimal sub-temperature quenching temperature was determined. The reason of sub-temperature quenching to suppress the temper embrittlement of the steel was analyzed. The toughening mechanism was also discussed. The test results show that the sub-temperature quenching process can reduce the temper embrittlement of non-equilibrium microstructure by medium-speed heating. When the original microstructure is in the state of quenched and tempered, under the condition of the same strength, the sub-tempered quenching can make the impact toughness ratio Completely quenched by about 50%.