Effect of V microalloying and intercritical annealing on improving strength-ductility balance of Al-bearing medium Mn steel

DOI

10.2991/978-94-6463-581-2_37How to use a DOI?

Keywords

Vanadium micro-alloying; Aluminum-bearing medium manganese steel; Retained austenite; TRIP effect

Abstract

The microstructure and mechanical properties of vanadium micro-alloyed Al-bearing medium-Mn steel were studied by SEM, TEM and EBSD technique. The results show that the microstructure of the steel after intercritical annealing from 710℃ to 770℃ was composed of banded δ-ferrite(δ-F), α- ferrite(F) and retained austenite (RA). The mechanical properties of experimental steel mainly depended on the sustained TRIP effect providing of RA during deformation. The large amount of RA and appropriate stability make a significant contribution to the excellent mechanical properties of steel through TRIP effect. With the increase of intercritical annealing temperature, the weakening of TRIP effect and the formation of fresh martensite led to an increase in ultimate tensile strength (UTS), but total elongation (TEL) and product of strength and elongation (PSE) decreased. Vanadium improved the yield strength (YS) and UTS of experimental steel by refining grains and precipitation strengthening, but deteriorated its plasticity. A high V content will lead to a decrease in RA content and stability, weakening the TRIP effect and resulting in a weaker strength-ductility balance. The experimental steel with 0.04% V has excellent comprehensive properties after intercritical annealing at 730℃, maintaining an UTS of 1000 MPa while exhibiting a TEL of 37% and a PSE of 37.7 GPa∙%.

Copyright

© 2024 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Download article (PDF)

TY  - CONF
AU  - Cansheng Yu
AU  - Guo Yuan
AU  - Weisen Zheng
AU  - Yanlin He
AU  - Jian Kang
AU  - Zhiyuan Chang
PY  - 2024
DA  - 2024/12/07
TI  - Effect of V microalloying and intercritical annealing on improving strength-ductility balance of Al-bearing medium Mn steel
BT  - Proceedings of the 7th International Conference on Advanced High Strength Steel and Press Hardening (ICHSU 2024)
PB  - Atlantis Press
SP  - 296
EP  - 311
SN  - 2590-3217
UR  - https://doi.org/10.2991/978-94-6463-581-2_37
DO  - 10.2991/978-94-6463-581-2_37
ID  - Yu2024
ER  -