研究了55NiCrMoV7钢在100℃~700℃、90s~665h之间回火的组织和力学性能变化.以钢的淬、回火和退火硬度作为基本参数,定义了回火度的概念,提出了具有Johnson-Mehl-Avrami关系式形式的、适用于无二次硬化钢的回火(时效)动力学规律.由该规律出发可以推出Hollomon-Jaffe回火参数与时间、温度和硬度的关系式.
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