时效温度对17-4PH沉淀硬化不锈钢析出行为和硬化效果的影响
Effect of aging temperature on precipitation and hardening behavior of 17-4PH stainless steel
杜涛,陈军,袁诚
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作者单位:武汉钢铁(集团)公司研究院中试工厂
中文关键字:17-4PH;ε-Cu;时效硬化;
英文关键字:17-4PH stainless steel;ε-Cu ;Aging hardening
中文摘要:17-4PH(0Cr17Ni4Cu4Nb)是一种马氏体沉淀硬化型不锈钢,含碳量低(<0.07%),含Ni、Cr 量高,同时该钢中Cu和Nb等合金元素含量也较高,这些合金元素在热处理过程中可析出时效硬化相ε-Cu、NbC、M23C6等,使材料具有较高的强度和硬度。基于以上优点,17-4PH马氏体沉淀硬化不锈钢广泛应用于航空、航天、化学和核工业等领域。实际生产中热处理工艺研究已经相当成熟[1-10],通过高温固溶+时效处理调整组织和控制析出相来提高强度、硬度和耐蚀性。国内外对该钢的强化机理进行了一些研究,普遍认为与ε-Cu 的析出有关。但对于ε-Cu 形貌的分析不尽相同[11-12]。本文研究了不同时效温度下Cu的析出行为,以及时效对该钢硬化效果进行分析。
英文摘要:In this research, the precipitating and hardening behavior of 17-4PH stainless steel aging at 480 to 630℃ for 4h were studied. It turned out that the ε-Cu precipitation is the result of hardening of 17-4 PH stainless steel, the hardening effect was closely related with ε-Cu precipitation and the changes of dislocation density. Both aging temperature and matrix structure have a very big effect on Cu precipitation behavior. The higher aging temperature, the greater the size of ε-Cu particle, the morphology eventually turned into short clavite. The growth tendency of ε-Cu particle in the region with low dislocation density was larger than that in the region with high dislocation density.