Copper Precipitation Behavior and Mechanical Properties of Cu‑Bearing Ferritic Stainless Steel with Diferent Cr Addition  

作　　者：Yifan Li Shengyao Ma Xinrui Zhang Tong Xi Chunguang Yang Hanyu Zhao Ke Yang 

机构地区：[1]Henan Institute of Advanced Technology,Zhengzhou University,Zhengzhou 450001,China [2]Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [3]School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2025年第3期383-395,共13页金属学报(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.52101293/52171242);the Natural Science Foundation of Medical and Industrial Cross Joint of Liaoning Province(Grant No.2022-YGJC-54).

摘　　要：The microstructure evolution and mechanical properties of Cu-bearing ferritic stainless steel with diferent Cr addition(Cr=12,15 and 17 wt%)were investigated.The phase transformation behavior under diferent cooling rate,Cu-rich precipitation behavior and its infuence on the mechanical properties under diferent aging treatment are systematically characterized using dilatometry,diferential scanning calorimeter(DSC)and transmission electron microscopy(TEM).The results indicated that the increase in Cr content narrowed the austenite phase region at high temperatures,afecting its microstructure under diferent cooling rates.The 12Cr-1.5Cu steel exhibited a fully austenitic phase region at high temperature and occurred apparent martensitic transformation after air cooling.Cooling rate signifcantly infuenced the phase transition of the steels,and subsequently afected its mechanical properties.All three investigated steels showed higher strength and lower plasticity in air cooling condition compared to furnace cooling condition,due to the presence of martensite.After aging treatment,high number densities of Cu-rich precipitates were formed in steel matrix and the size of Cu-rich precipitates increased obviously with increasing aging temperature,while the tendency for number density was opposite.Fine and dispersed Cu-rich precipitates formed during low-temperature aging enhanced strength of the steels,while larger Cu-rich phases developed during high-temperature aging endowed greater ductility to the steels.Notably,the Cr content had no signifcant efect on the precipitation behavior of Cu-rich precipitation.These comprehensive results and analyses could provide a solid foundation for broader applications of Cu-bearing ferritic stainless steels.

关 键 词：Cu-bearing stainless steel Mechanical property Cu-rich precipitate Microstructure 

分 类 号：TG1[金属学及工艺—金属学]