Enhancement of low-temperature toughness of Fe-Mn-C-Al alloy by rare earth Ce-modified inclusions  

作　　者：Guang-kai Yang Chang-ling Zhuang Yi-zhuang Li Chen Hu Shao-bo Li 

机构地区：[1]College of Materials and Metallurgy,Guizhou University,Guiyang,550025,Guizhou,China [2]Department of Mechanical Engineering,University of Hong Kong,Hong Kong,999077,China [3]The State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang,110819,Liaoning,China [4]State Key Laboratory of Public Big Data,Guizhou University,Guiyang,550025,Guizhou,China

出　　处：《Journal of Iron and Steel Research International》2024年第1期157-173,共17页

基　　金：This work was supported by the National Natural Science Foundation of China(No.52164032);the Hong Kong Scholars Program(2021-077).

摘　　要：Fe-Mn-C-Al alloys have been recognized as promising materials for certain low-temperature applications due to their exceptional mechanical properties and cost-effectiveness.However,their limited low-temperature toughness restricts their large-scale applications in specific scenarios.The influence of trace amounts of rare earth cerium(Ce)on the low-temperature toughness of Fe-18Mn-0.6C-1.8Al alloys was investigated.The addition of Ce effectively alters the inclu-sions in the alloy,transforming large-sized irregular inclusions into fine ellipsoidal rare earth inclusions.This leads to a significant reduction in both the proportion and average size of the inclusions,resulting in their effective dispersion throughout the matrix and improved cryogenic performance.The presence of Ce-containing inclusions within the matrix reduces stress concentration,thereby inhibiting microcrack formation and improving impact absorption energy.Specifi-cally,the addition of rare earth Ce alters the fracture behavior of the material at room temperature and low temperature,changing from brittle cleavage fracture to a more ductile failure mode.The impact toughness of the Fe-Mn-C-Al alloy is significantly improved by the addition of 0.0048 wt.%Ce,particularly at-196℃where the impact toughness reaches 103.6 J/cm^(2),representing an impressive improvement of 87.3%.

关 键 词：Fe-Mn-C-Al alloy Rare earth Low-temperature toughness Inclusion Fracture 

分 类 号：TG14[一般工业技术—材料科学与工程]