|
|
|
| Microstructure and mechanical properties of hot-rolled V-microalloyed Al-containing medium-Mn steel |
| Ming Lei1, Wei‑jun Hui1, Jiao‑jiao Wang1, Yong‑jian Zhang1, Xiao‑li Zhao1 |
| 1 School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China |
|
|
|
|
Abstract The microstructure and mechanical properties of a V-microalloyed Al-containing medium-Mn steel after hot rolling and intercritical annealing (IA) are explored. The tested steel exhibits a fne multiphase microstructure consisting of bimodal sizes of ferrite and retained austenite plus considerable amount of fne VC and/or M3C precipitates. Physical–chemical phase analysis shows that about 71.0% of the total V is in VC phase and more than 93% of VC particles is less than 5 nm. The calculated precipitation strengthening values of VC are ~ 347 and ~ 234 MPa for the specimens intercritically annealed at 625 and 750 °C, respectively. An excellent combination of strength and ductility as high as ~ 50 GPa% and yield strength (YS) of 890 MPa was obtained at intercritical temperature (TIA) of 725 °C, although it does not correspond to the maximum precipitation strengthening of VC phase. Therefore, it is suggested that an optimization of TIA corresponding to both excellent combination of strength and ductility and high YS should be further explored through chemical composition and IA process optimization.
|
|
|
|
|
|
| Cite this article: |
|
Ming Lei,Wei?jun Hui,Jiao?jiao Wang, et al. Microstructure and mechanical properties of hot-rolled V-microalloyed Al-containing medium-Mn steel[J]. Journal of Iron and Steel Research International, 2020, 27(5): 537-548.
|
|
|
|
| [1] |
Wan‑lin Wang, Guo‑min Ying, Jie Zeng, Hai‑hui Zhang. Effect of electropulsing treatment on solidification behavior of spring steels in a continuous casting mold simulator[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(6): 656-664. |
| [2] |
Chun‑xu Wang, Yuan‑hang Gao, Yong Li, Shun Han, Shao‑zun Liu, Peng‑jie Zhang. Effects of solid?solution temperature on microstructure and mechanical properties of a novel 2000 MPa grade ultra?high?strength steel[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(6): 710-718. |
| [3] |
Xiao-ping Ma, Dian-zhong Li. Coalescence-dominated microstructure evolution during solidification of 20SiMn steel[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(5): 506-516. |
| [4] |
Xiao‑long Liang, Hui Wang, Qian‑fu Pan, Ji‑yun Zheng, Hui‑qun Liu, Rui‑qian Zhang, Yang Xu, Yu Xu, Dan‑qing Yi. Recrystallization and mechanical properties of cold-rolled FeCrAl alloy during annealing[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(5): 549-565. |
| [5] |
Sang-in Lee, Byoungchul Hwang. Correlation of microstructure with tensile behavior and properties of API X70 pipeline steels subjected to strain aging[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(3): 319-324. |
| [6] |
Hu Chen, Chi Zhang, Hao Chen, Zhi-gang Yang, Lei Chen. Understanding microstructure-evolution-dependent fracture behaviors in pearlitic steels[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(3): 334-341. |
|
|
|
|
2020, Vol. 27 
