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研究了亚温淬火时α_a和α_g及其含量对30CrMnSiA钢强韧性的影响。得出,α_a和α_g均能提高30CrMnSiA钢无脆化回火以及脆化回火后的室温和低温韧性。无论予处理加热温度和保温时间以及亚温淬火加热温度如何,均以α_a更佳。α相量的影响受α相形态的制约。对α_a而言,韧性受α相量的影响不大;对α_g而言,韧性随α相量减少而增加。予处理温度对针状组织的性能基本无影响,但升高予处理温度对颗粒状组织的性能有害。亚温淬火诸因素对经低温回火后的高强30CrMnSiA钢亦有与上述同样的影响效果和影响规律。
The effects of α_a and α_g and their contents on the toughness of 30CrMnSiA steel during sub-temperature quenching were studied. It is concluded that both α_a and α_g can improve the room temperature and low temperature toughness of the 30CrMnSiA steel after being free from embrittlement and tempering. Α_a is preferred regardless of the heating temperature and holding time, and the heating temperature of sub-temperature quenching. The influence of the alpha phase is governed by the alpha phase morphology. For α_a, the toughness is less affected by the amount of α phase; for α_g, the toughness increases with decreasing phase α. Pretreatment temperature had no effect on the acicular tissue properties, but increasing the pretreatment temperature was detrimental to the performance of the granular tissue. Sub-temperature quenching of the various factors on the low-temperature tempering high-strength 30CrMnSiA steel also have the same effect and impact on the law.