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研究了17-4PH沉淀硬化不锈钢在(480~630)℃×4 h时效处理中的析出行为和硬化效果。结果表明,ε-Cu相析出使17-4PH马氏体沉淀硬化不锈钢硬化,硬化效果与Cu的析出和位错密度的变化密切相关。时效温度和基体组织对Cu析出行为有很大影响。时效温度越高,ε-Cu相颗粒的尺寸越大,形态由颗粒状最终变为短棒状。在位错密度低的区域,ε-Cu相颗粒的长大倾向要比位错密度高的区域大。
The precipitation behavior and hardening effect of 17-4PH precipitation-hardened stainless steel during (480 ~ 630) ℃ × 4 h aging were studied. The results show that precipitation of ε-Cu phase hardens the 17-4PH martensitic precipitation hardened stainless steel. The hardening effect is closely related to the precipitation and dislocation density of Cu. The aging temperature and matrix microstructure have a great influence on the Cu precipitation behavior. The higher the aging temperature is, the larger the size of the ε-Cu phase particles is, the more the morphology changes from granular to short rod. In regions with low dislocation density, the ε-Cu phase particles tend to grow larger than the regions with higher dislocation density.