Effect of Mo content on the thermal stability of Ti-Mo-bearing ferritic steel  

作　　者：Yao Huang Wei-ning Liu Ai-min Zhao Jun-ke Han Zhi-gang Wang Hong-xiang Yin 

机构地区：[1]China Electric Power Research Institute,Beijing 100192,China [2]Institute of Engineering Technology,University of Science and Technology Beijing,Beijing 100083,China [3]State Grid Corporation,Beijing 100031,China [4]Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China [5]Metal and Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2021年第3期412-421,共10页矿物冶金与材料学报（英文版）

基　　金：the National Natural Science Foundation of China(No.51601174).

摘　　要：The effects of tempering holding time at 700℃on the morphology,mechanical properties,and behavior of nanoparticles in Ti-Mo ferritic steel with different Mo contents were analyzed using scanning electron microscopy and transmission electron microscopy.The equilibrium solid solution amounts of Mo,Ti,and C in ferritic steel at various temperatures were calculated,and changes in the sizes of nanoparticles over time at different Mo contents were analyzed.The experimental results and theoretical calculations were in good agreement with each other and showed that the size of nanoparticles in middle Mo content nano-ferrite(MNF)steel changed the least during aging.High Mo contents inhibited the maturation and growth of nanoparticles,but no obvious inhibitory effect was observed when the Mo content exceeded 0.37wt%.The tensile strength and yield strength continuously decreased with the tempering time.Analysis of the strengthening and toughening mechanisms showed that the different mechanical properties among the three different Mo content experiment steels were mainly determined by grain refinement strengthening(the difference range was 30-40 MPa)and precipitation strengthening(the difference range was 78-127 MPa).MNF steel displayed an ideal chemical ratio and the highest thermodynamic stability,whereas low Mo content nano-ferrite(LNF)steel and high Mo content nano-ferrite(HNF)steel displayed relatively similar thermodynamic stabilities.

关 键 词：ferritic steel NANOPARTICLES interphase precipitation thermal stability ostwald ripening rate 

分 类 号：TG142.23[一般工业技术—材料科学与工程]