Synergistic dispersion strengthening of Fe-Cr alloys by oxides and carbides: Microstructure and mechanical property enhancement

作     者：Chen, Tuowen Tuo, Jingyi Wu, Yihao Wang, Hui Sun, Yongduo Huang, Xuefei 

作者机构：College of Materials Science and Engineering Sichuan University Chengdu610065 China National Key Laboratory of Nuclear Reactor Technology Nuclear Power Institute of China Sichuan Chengdu610213 China 

出 版 物：《Journal of Alloys and Compounds》 (J Alloys Compd)

年 卷 期：2025年第1035卷

核心收录：

学科分类：080602[工学-钢铁冶金] 080603[工学-有色金属冶金] 0806[工学-冶金工程] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：This work is supported by the National Natural Science Foundation of China (Grant No. 12375257  52122103  52471085)  the Scientific Research Program for Young Talent of China National Nuclear Corporation (No. NPIC-Z3022024003)  the Nuclear Power Institute of China - Sichuan University Joint Innovation Fund (Grant No. SCU&NPIC-LHCX-32)  and the Fundamental Research Funds for the Central Universities 

主　　题：Microstructure 

摘      要：Fe-Cr alloys were fabricated using powder metallurgy (PM) with varying additions of ZrC (0–1.5 wt%) to investigate the influence on microstructure and mechanical properties. The resulting alloys exhibited a bimodal grain structure with dispersed nano-oxides (TaO, ZrO2) and carbides (ZrC). The alloy containing 1.5 wt% ZrC demonstrated the most favourable combination of properties, achieving a yield strength of 1373 MPa and an elongation of 11.9 % at room temperature, which is attributed to synergistic dispersion strengthening. At 700°C, this alloy retained a yield strength of 470 MPa, surpassing that of many oxide dispersion-strengthened alloys. Incorporating ZrC refined the microstructure, promoted phase transformations, and inhibited the formation of coarse oxides, enhancing strength and ductility. © 2025 Elsevier B.V.