Cu元素对AMS6308钢抗回火性能的影响  

Effect of Cu on temper-resistant of AMS6308 steel

作　　者：赵吉庆[1] 杨钢[1] 彭涛[1,2] ZHAO Ji-qing;YANG Gang;PENG Tao(Institute of Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China;Collaborative Innovation Center of Steel Generic Technolgy,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]钢铁研究总院特殊钢研究所,北京100081 [2]北京科技大学钢铁共性技术协同创新中心,北京100083

出　　处：《钢铁》2021年第4期76-82,共7页Iron and Steel

基　　金：国家重点研发计划资助项目(2016YFB0300203)。

摘　　要：为研究Cu元素对AMS6308钢耐温性的影响,采用SEM、TEM、EBSD、相分析和力学性能测试等手段,研究了不同回火温度下,AMS6308钢(含2%Cu)与不含Cu对比试验钢的组织与力学性能,探讨AMS6308钢中Cu元素对提高抗回火性能的作用。结果表明,随着回火温度提高,AMS6308钢强度先升后降,450℃出现峰值,并且整个回火温度区间强度均高于无Cu钢。400℃以下温度回火,Cu元素提高整体强度与抗回火性能,主要依靠固溶强化、增加M_(6)C相的析出强化、细晶强化3种方式的共同作用,主要强化机制是M_(6)C相析出强化。400℃以上温度回火,Cu元素主要依靠ε-Cu相的析出强化,提高强度与抗回火性能。ε-Cu相通过与位错的交互作用,产生强烈的沉淀强化,并在更高回火温度下,使钢保持较为完整的板条结构。In order to study influence of Cu element on the heat resistance property of AMS6308 steel,microstructure and mechanical properties of AMS6308 steel which contains 2%Cu element and steel without Cu as the contrastive test steel at different tempering temperature was studied by SEM,TEM,EBSD,phase analysis and mechanical properties test.And the effect of Cu on increasing temper-resistant of AMS6308 steel was discussed.The results show that strength rises first and then declines with increasing tempering temperature.Maximum peak of strength appears at 450℃ tempering temperature.At the whole tempering temperature range,AMS6308 steel has higher strength than steel without Cu.When tempering temperature below 400℃,the element Cu promotes strength and temper-resistant depending on the effect of solution strengthening of Cu,enhancing precipitation strengthening of M_(6)C phase and refined crystalline strengthening.And enhancing precipitation strengthening of M_(6)C phase is the main strength method.When tempering temperature exceed 400℃,the element Cu promotes strength and temper-resistant depending on the effect of precipitation strengthening of ε-Cu phase.The interaction effect of ε-Cu phase and dislocation produces strong precipitation strengthening and makes the steel maintaining relatively completed lath structure at higher tempering temperature.

关 键 词：AMS6308钢 齿轮钢 Ε-CU相 抗回火性能 二次强化 

分 类 号：TG142.1[一般工业技术—材料科学与工程]