Multi-mechanism crystal plasticity simulation and experimental study for uniaxial tensile deformation of 7Mn1Al Medium-Mn steel
Year: 2025
Type: article
Abstract: The uniaxial tensile deformation behavior and microstructure evolutions of 7Mn1Al Medium-Mn steel were investigated by mechanical property testing, X-ray diffractometer (XRD), and quasi in-situ electron backscattered diffraction (EBSD) characterization. Then, a coupled crystal plasticity constitutive model incorporating dislocation slip, twinning, and phase transformation mechanisms was established. A finite element model was constructed based on EBSD data obtained before deformation. The uniaxial tensile deformation process of 7Mn1Al medium-Mn steel was simulated using ABAQUS software. The results indicated that the 7Mn1Al steel, after warm rolling and annealing, exhibited outstanding mechanical properties with a tensile strength of 1089 MPa, an elongation of 46%, and the product of strength and elongation (PSE) of 50 GPa·%. The microstructure is composed of granular, blocky, and lamellar austenite and ferrite. The different stability of austenite leads to a two-stage discontinuous transformation-induced plasticity (TRIP) effect during the deformation process. Local stress and strain in the experimental steel exhibit alternating characteristics during the tensile deformation process, with maximum values of stress and strain alternating between the ferrite and martensite-austenite island (including newly formed martensite and original austenite, named MA island). The TRIP effect leading to a higher work-hardening rate of MA island is the main reason for this phenomenon. The transformation of martensite primarily occurs in the early stage of tensile deformation (ε < 0.2). Phase transformation initially takes place in regions with an austenite orientation of 101 and granular morphology, subsequently suppressing the occurrence of twinning in the subsequent deformation process.
Authors: Mingming Wang, Jiashuai He, Guangshun Guo, Yayu Zhao, Xiaoyan Zhang, Xiaowen Sun, Chunyang Zhang, Hongchao Ji, Zixuan Cui
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,640
Funders: Natural Science Foundation of Hebei Province, Hebei Provincial Department of Bureau of Science and Technology, Tangshan Science and Technology Bureau, National Key Research and Development Program of China, National Key Research and Development Program of China Stem Cell and Translational Research
OpenAlex ID: W4409124985