Enhancing strength–ductility synergy in medium Mn steel with hetero-structured austenite developed by two-stage cyclic thermomechanical treatment and flash annealing

Qixiang Jia; Lei Chen; Xiang Chen; Howook Choi; Zhibin Xing; Siwhan Lee; Hwangsun Kim; Haoyu Wang; Huagui Huang; Miao Jin; Heung Nam Han

doi:10.1016/j.scriptamat.2022.115196

Enhancing strength–ductility synergy in medium Mn steel with hetero-structured austenite developed by two-stage cyclic thermomechanical treatment and flash annealing

Qixiang Jia, Lei Chen, Xiang Chen, Howook Choi, Zhibin Xing, Siwhan Lee, Hwangsun Kim, Haoyu Wang, Huagui Huang, Miao Jin, Heung Nam Han

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

In this study, a novel and efficient processing strategy involving a two-stage thermomechanical process and flash annealing (FA) was applied to medium Mn steel (MMnS) to achieve hetero-structure with a tailored dislocation distribution, resulting in considerably enhanced strength–ductility synergy. Through the observations of in-situ electron backscattering diffraction (EBSD) and transmission electron microscopy (TEM), it is confirmed that FA can heterogeneously distribute dislocations between coarse and fine-grained austenite by inhibiting recrystallization and martensitic reverse transformation. Furthermore, the high dislocation density in austenite of FA-processed MMnS increased the yield strength by almost 1.7 times compared to MMnS subjected to conventional intercritical annealing (IA). Hetero-deformation and transformation-induced plasticity were induced in heterostructured austenite, which improved strain hardening ability and corresponding ductility. This study offers a unique process method for heterostructured microstructure design for multiphase steels with metastable austenite to remarkably enhance mechanical performance.

Original language	English
Article number	115196
Journal	Scripta Materialia
Volume	226
DOIs	https://doi.org/10.1016/j.scriptamat.2022.115196
State	Published - Mar 15 2023
Externally published	Yes

Funding

The financial supported by National Natural Science Foundation of China (Grant Nos. 52275388 , U20A20230 , and 52075474 ), Natural Science Foundation of Hebei province , China (Grant No. E2022203206 ), and Cultivation Project for Basic Research and Innovation of Yanshan University (Grant No. 2021LGZD009 ). One of the authors (Heung Nam Han) was supported by the National Research Foundation of Korea (NRF) grants funded by the Ministry of Science and ICT (MSIT) (Grant Nos. 2019M3D1A1079215 , 2020R1A5A6017701 , and 2021R1A2C3005096 ). Howook Choi has been supported by POSCO Science Fellowship of POSCO TJ Park Foundation and KIAT for Graduate Educational Traineeship Program (No. P0002019 ). Qixiang Jia and Xiang Chen gratefully acknowledges the scholarship granted by the China Scholarship Council (Grant No. 20210813013 and No. 202106050085 ).

Keywords

Flash annealing process
Heterogeneous structure
Localized deformation
Medium Mn steel
Transformation-induced plasticity

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10.1016/j.scriptamat.2022.115196

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Jia, Q., Chen, L., Chen, X., Choi, H., Xing, Z., Lee, S., Kim, H., Wang, H., Huang, H., Jin, M., & Han, H. N. (2023). Enhancing strength–ductility synergy in medium Mn steel with hetero-structured austenite developed by two-stage cyclic thermomechanical treatment and flash annealing. Scripta Materialia, 226, Article 115196. https://doi.org/10.1016/j.scriptamat.2022.115196

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title = "Enhancing strength–ductility synergy in medium Mn steel with hetero-structured austenite developed by two-stage cyclic thermomechanical treatment and flash annealing",

abstract = "In this study, a novel and efficient processing strategy involving a two-stage thermomechanical process and flash annealing (FA) was applied to medium Mn steel (MMnS) to achieve hetero-structure with a tailored dislocation distribution, resulting in considerably enhanced strength–ductility synergy. Through the observations of in-situ electron backscattering diffraction (EBSD) and transmission electron microscopy (TEM), it is confirmed that FA can heterogeneously distribute dislocations between coarse and fine-grained austenite by inhibiting recrystallization and martensitic reverse transformation. Furthermore, the high dislocation density in austenite of FA-processed MMnS increased the yield strength by almost 1.7 times compared to MMnS subjected to conventional intercritical annealing (IA). Hetero-deformation and transformation-induced plasticity were induced in heterostructured austenite, which improved strain hardening ability and corresponding ductility. This study offers a unique process method for heterostructured microstructure design for multiphase steels with metastable austenite to remarkably enhance mechanical performance.",

keywords = "Flash annealing process, Heterogeneous structure, Localized deformation, Medium Mn steel, Transformation-induced plasticity",

author = "Qixiang Jia and Lei Chen and Xiang Chen and Howook Choi and Zhibin Xing and Siwhan Lee and Hwangsun Kim and Haoyu Wang and Huagui Huang and Miao Jin and Han, {Heung Nam}",

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AU - Jia, Qixiang

AU - Chen, Lei

AU - Chen, Xiang

AU - Choi, Howook

AU - Xing, Zhibin

AU - Lee, Siwhan

AU - Kim, Hwangsun

AU - Wang, Haoyu

AU - Huang, Huagui

AU - Jin, Miao

AU - Han, Heung Nam

PY - 2023/3/15

Y1 - 2023/3/15

N2 - In this study, a novel and efficient processing strategy involving a two-stage thermomechanical process and flash annealing (FA) was applied to medium Mn steel (MMnS) to achieve hetero-structure with a tailored dislocation distribution, resulting in considerably enhanced strength–ductility synergy. Through the observations of in-situ electron backscattering diffraction (EBSD) and transmission electron microscopy (TEM), it is confirmed that FA can heterogeneously distribute dislocations between coarse and fine-grained austenite by inhibiting recrystallization and martensitic reverse transformation. Furthermore, the high dislocation density in austenite of FA-processed MMnS increased the yield strength by almost 1.7 times compared to MMnS subjected to conventional intercritical annealing (IA). Hetero-deformation and transformation-induced plasticity were induced in heterostructured austenite, which improved strain hardening ability and corresponding ductility. This study offers a unique process method for heterostructured microstructure design for multiphase steels with metastable austenite to remarkably enhance mechanical performance.

AB - In this study, a novel and efficient processing strategy involving a two-stage thermomechanical process and flash annealing (FA) was applied to medium Mn steel (MMnS) to achieve hetero-structure with a tailored dislocation distribution, resulting in considerably enhanced strength–ductility synergy. Through the observations of in-situ electron backscattering diffraction (EBSD) and transmission electron microscopy (TEM), it is confirmed that FA can heterogeneously distribute dislocations between coarse and fine-grained austenite by inhibiting recrystallization and martensitic reverse transformation. Furthermore, the high dislocation density in austenite of FA-processed MMnS increased the yield strength by almost 1.7 times compared to MMnS subjected to conventional intercritical annealing (IA). Hetero-deformation and transformation-induced plasticity were induced in heterostructured austenite, which improved strain hardening ability and corresponding ductility. This study offers a unique process method for heterostructured microstructure design for multiphase steels with metastable austenite to remarkably enhance mechanical performance.

KW - Flash annealing process

KW - Heterogeneous structure

KW - Localized deformation

KW - Medium Mn steel

KW - Transformation-induced plasticity

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Enhancing strength–ductility synergy in medium Mn steel with hetero-structured austenite developed by two-stage cyclic thermomechanical treatment and flash annealing

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