在研究了钢中含碳量影响亚温淬火强韧化效果的基础上,探讨了低碳效果好,高碳效果差的机理。同样,在研究了亚温淬火加热温度影响强韧化效果的基础上,提出了亚温淬火最佳加热温度以接近上临界点为宜的部分原因。 Based on the study of the effect of carbon content in steel on the strengthening and toughening effect of sub-temperature quenching, the mechanism of good low-carbon effect and poor high-carbon effect was discussed. Similarly, on the basis of studying the effect of heating temperature of sub-temperature quenching on the strengthening and toughening effect, some reasons why the optimal heating temperature of sub-temperature quenching approaches the upper critical point are proposed.