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研究了不同铜含量的低合金高强钢 (HSL A)在 45 0～ 6 5 0℃时效时的行为 ,用光学显微镜和电镜观察分析了钢中各种析出物的相互影响及其对组织变化的相互作用 ,以及这种相互作用与时效过程中硬度变化的关系。试验结果表明 :时效是组织软化与析出硬化两种机制相互竞争的结果 ,析出硬化过程包括ε- Cu析出、铌的碳氮化物析出以及含铬的碳化物析出 3种强化效应。这些因素共同作用的结果造成了时效过程中硬度曲线变化的复杂性
The behavior of low alloy high strength steel (HSL A) with different copper contents at 45 0 ~ 65 0 ℃ was studied. The interaction between various precipitates in steel and its effect on the microstructure evolution were analyzed by optical microscope and electron microscope Interaction, and the relationship between this interaction and hardness changes during aging. The results show that aging is the result of the mutual competition between the two mechanisms of tissue softening and precipitation hardening. The precipitation hardening process includes three kinds of strengthening effects of ε-Cu precipitation, niobium carbonitride precipitation and chromium-containing carbide precipitation. The combined effect of these factors contributes to the complexity of the change in hardness curve during the aging process