FeCr合金时效硬化与微观结构的关系研究  

Research on Relation of Ageing Hardening and Microstructure in FeCr Alloy

作　　者：孙丽娟 丁小明 陈冬生 黄粒 杜旭初 SUN Lijuan;DING Xiaoming;CHEN Dongsheng;HUANG Li;DU Xuchu(AECC Beijing Institute of Aeronauecai Materials,Beijing 100095,China)

机构地区：[1]中国航发北京航空材料研究院,北京100095

出　　处：《工业加热》2021年第1期49-51,58,共4页Industrial Heating

基　　金：国家自然科学基金资助项目(51501067);国家高速列车技术创新中心建设专项科技研发项目(2019JK-0201)。

摘　　要：研究了时效处理对Fe-Cr合金屈服强度和微观结构的影响,主要阐述了Fe-Cr相分解与时效硬化的关系。所研究的Fe-Cr合金是通过真空氩弧熔炼的方法制备的,其中Cr含量为15%。时效温度控制在450℃,时效时间长达10 000 h。时效后,Fe-Cr合金有明显的时效硬化,表现为屈服强度的显著提高。投射电子显微镜观察表明,Fe-Cr相分解通过形核-不均匀长大的方式形成富Cr析出物;随着时效时间的延长,富Cr析出物的数密度和尺寸都在发生变化。定量分析结果表明,Fe-Cr合金的时效硬化可以用Orowan型强化模型解释。The effect of ageing on yield strength and microstructure in Fe-Cr alloy was investigated with focusing on the relation of Fe-Cr phase decomposition and ageing hardening.The alloy investigated was fabricated by arc-melting in vacuum with Cr content around 15%.Samples were thermal aged at 450℃for up to 10000 h.After ageing,there was obvious ageing hardening,namely,significant increase in yield strength.The results of TEM indicate that Fe-Cr phase decomposition occurs via nucleation-non steady growth by forming Cr-rich precipitates;with increasing ageing time,the number density and diameter of Cr-rich precipitates changes.Method of quantitative analysis shows that the ageing hardening in Fe-Cr alloy can be interpreted by Orowan type strengthening model.

关 键 词：铁铬相分解 时效硬化 富Cr析出物 Orowan 

分 类 号：TG113.12[金属学及工艺—物理冶金]