Microstructural evolution during tempering process and mechanical properties of Cr-Ni-Mo-V/Nb high strength steel  

作　　者：Zi-wei Lv Jing Fan Rui Wang Zhi-qiang Yu Yan Kang Yong Hu Lei-feng Tuo Jürgen Eckert Zhi-jie Yan 

机构地区：[1]School of Materials Science and Engineering,North University of China,Taiyuan 030051,Shanxi,China [2]Shanxi Key Laboratory of Advanced Metal Materials for Special Environments,North University of China,Taiyuan 030051,Shanxi,China [3]School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,Shanxi,China [4]Erich Schmid Institute of Materials Science,Austrian Academy of Sciences,Leoben 8700,Austria [5]Department of Materials Science,Chair of Materials Physics,Montanuniversitat Leoben,Leoben 8700,Austria

出　　处：《Journal of Iron and Steel Research International》2025年第1期270-281,共12页钢铁研究学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51904278,51974288 and 52071300);the Special Funding Projects for Local Science and Technology Development guided by the Central Committee(YDZJSX2021C007,YDZJSX2021B020 and YDZX20191400004587);the Key Research and Development Project of Shanxi Province(202102050201004,202102150401002,202202050201015);the Scientific and Technological Innovation Talent Team Project of Shanxi Province(202204051002020);the Basic Research Program of Shanxi Province(20210302123218,202203021212126,202203021221096);the Foundation of the State Key Laboratory of Advanced Metallurgy,USTB(K22-11);the Special Project for Transformation of Scientific Achievements(202204021301025).

摘　　要：High strength steels exhibit superior mechanical properties due to the unique microstructure,which successfully solves the drawback of the inevitable strength-toughness trade-off that occurs in traditional alloys.Here we investigated the effect of matrix and precipitates on mechanical properties of Cr-Ni-Mo-V/Nb steel after water quenching and tempering(150-500℃).The results showed that the microstructure of the present steel is noticeably tuned by changing the tempering temperature.An excellent combination of strength(a yield strength of 1308 MPa with a total elongation of 8.2%)and toughness(Charpy V-notch impact toughness of 40.5 J/cm^(2))is obtained upon tempering at 200℃.This is attributed to the lath martensite containing high dislocation density,the martensite-twin substructure,and the strengthening effects of the precipitated needle-likeε-carbides and spherical VC particles.The acicularε-carbides are replaced by the rod-shaped Fe_(3)C at the tempering temperature of 350℃,resulting in the remarkable deterioration in strength,hardness,and elongation.Spheroidized carbides formed at a tempering temperature of 500℃ are beneficial to the enhancement of the elongation and toughness,but the strength decreases due to the matrix softening caused by the recovery of dislocation.

关 键 词：High strength steel TEMPERING Microstructure CARBIDE Mechanical property 

分 类 号：TG457.11[金属学及工艺—焊接]