In-situ investigation of strengthening and strain hardening mechanisms of Cu-added medium-Mn steels by synchrotron-based high-energy X-ray diffraction

Zhang, Minghe; Sun, Lihui; Liu, Yaliang; Feng, Yunli; Xu, Ning; Chen, Haiyang; Wang, Yan-Dong

doi:10.1016/j.jmrt.2023.03.209

In-situ investigation of strengthening and strain hardening mechanisms of Cu-added medium-Mn steels by synchrotron-based high-energy X-ray diffraction

Journal Article · Sat Apr 01 04:00:00 EDT 2023 · Journal of Materials Research and Technology

DOI:https://doi.org/10.1016/j.jmrt.2023.03.209· OSTI ID:2423488

Zhang, Minghe ^[1]; Sun, Lihui ^[1]; Liu, Yaliang ^[1]; Feng, Yunli ^[1]; Xu, Ning ^[2]; Chen, Haiyang ^[2]; Wang, Yan-Dong ^[2]

North China University of Science and Technology, Tangshan (China)
Univ. of Science and Technology, Beijing (China)

A novel Cu-added medium-Mn steel with a chemical composition of Fe–0.27C–9.1Mn–1.86Al–3.3Cu (wt.%) was designed and subjected to intercritical annealing (IA) temperature range from 620 °C to 680 °C for 1 h. The ultimate tensile strength (UTS) increases and the yielding strength (YS) decreases with the IA temperature increasing. The YS of 824 MPa, UTS of 1222 MPa, total elongation (TE) of 55%, and product of strength and elongation (PSE) of 67.2 GPa·% are achieved after IA at 660 °C. Transmission electron microscopy confirmed that Cu-rich nanoparticles precipitate in the ferrite. The in-situ high-energy X-ray diffraction (HE-XRD) experiments show that at the beginning of plastic deformation, both austenite and ferrite bear the applied load. The load is mainly undertaken by martensite with effective transformation-induced plasticity (TRIP) effect triggered. The YS of ferrite is significantly higher than that of austenite. The individual contribution of solid solution strengthening, grain refinement strengthening, dislocation strengthening, and precipitation strengthening in ferrite and austenite is analyzed. The discrepancy between the YS of ferrite and austenite is mainly attributed to the precipitation strengthening due to the Cu-rich nanoparticles precipitation. The moderate mechanical stability and the collaboration of TRIP and twinning-induced plasticity (TWIP) effects of austenite contributed to the enhanced strain hardening capability and resulted in large ductility.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Natural Science Foundation of Hebei Province

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2423488

Journal Information:: Journal of Materials Research and Technology, Journal Name: Journal of Materials Research and Technology Journal Issue: C Vol. 24; ISSN 2238-7854

Publisher:: Brazilian Metallurgical, Materials and Mining AssociationCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
42 ENGINEERING
High-energy X-ray diffraction (HE-XRD)
Materials Science
Medium-Mn steel
Metallurgy & Metallurgical Engineering
Strain hardening
Strengthening mechanisms
Transformation-induced plasticity (TRIP)

In-situ investigation of strengthening and strain hardening mechanisms of Cu-added medium-Mn steels by synchrotron-based high-energy X-ray diffraction

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