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测量了两种Cr-Mo系钢的退火态、淬火态和回火态硬度,并运用Hollomon-Jaffe和转变速率关系式分别计算了两种钢的回火激活能。结果表明,在600~700℃之间回火时,含有较多C和碳化物形成元素Cr和V的H10MOD钢激活能高于3Cr-3Mo钢,说明H10MOD钢的回火稳定性高于3Cr-3Mo钢。Hollomon-Jaffe和转变速率关系式均可在一定的温度范围适用,然而转变速率关系式计算得到的激活能数值低于Hollomon-Jaffe关系式计算所得激活能。
The annealing, quenching and tempering hardness of two Cr-Mo steels were measured. The tempering activation energies of the two steels were calculated respectively by the relationship between Hollomon-Jaffe and transformation rate. The results show that the activation energy of H10MOD steel containing more C and carbide-forming elements Cr and V is higher than that of 3Cr-3Mo steel when tempering at 600-700 ℃, indicating that the tempering stability of H10MOD steel is higher than that of 3Cr- 3Mo steel. The relationship between Hollomon-Jaffe and the rate of change can be applied over a range of temperatures, however, the value of the calculated activation energy for the transition rate relationship is lower than the calculated activation energy for the Hollomon-Jaffe relation.