Chro-austempering treatment of a medium-carbon high-strength bainitic steel  

作　　者：Man Liu Jun-yu Tian Feng Cai Cheng-gang Pan Guang Xu 

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy,The Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,The Collaborative Innovation Center for Advanced Steels of Ministry of Education,Wuhan University of Science and Technology,Wuhan,430081,Hubei,China [2]Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking,Wuhan University of Science and Technology,Wuhan,430081,Hubei,China

出　　处：《Journal of Iron and Steel Research International》2023年第2期317-327,共11页

基　　金：The National Natural Science Foundation of China(NSFC)(51874216 and 52104381);the Key Project of Hebei Iron and Steel Group(HG219313);the Open Fund of Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking(KF-20-4);Natural Science Foundation of Hubei(2021CFB127);China Postdoctoral Science Foundation(2021M702539).

摘　　要：The integrated processing of chromizing and austempering(termed chro-austempering)treatments was proposed.The microstructure and properties of a medium-carbon high-strength bainitic steel treated by chro-austempering treatments were investigated by metallography,scanning vibrating electrode technique,electrochemical workstation,and microhardness test.The results show that the high-strength bainitic steel with carbide-free bainite as matrix and the chromized layers on surfaces was successfully fabricated by chro-austempering treatment.The hardness of surface layers was about 3.5 times that of the bainite matrix.Meanwhile,the corrosion started from exposed bainitic matrix and proceeded along the depth direction,testifying that the surface corrosion resistance was significantly improved by chro-austempering treatment due to the formation of Cr_(7)C_(3)and(Cr,Fe)7_(7)C_(3)on the surface.

关 键 词：Chro-austempering Chromizing AUSTEMPERING Bainitic transformation Corrosion resistance HARDNESS High-strength bainitic steel 

分 类 号：TG161[金属学及工艺—热处理]