Influence of manganese on deformation behavior of lightweight steel at different strain rate

He, Zhongping, Yang, Hongyu, He, Yanlin, Zheng, Weisen, Guan, Zhongwei ORCID: 0000-0002-6967-3508 and Li, Lin
(2020) Influence of manganese on deformation behavior of lightweight steel at different strain rate. Journal of Materials Research and Technology, 9 (5). pp. 11611-11621.

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Tensile deformation behavior of Fe-0.25C-3.5(10)Mn-5Al lightweight steel was studied in a large range of strain rate (0.001-1200 s−1) by using a universal material testing machine, intermediate strain rate tensile testing apparatus and rotation disk bar-bar tensile impact apparatus. Microstructures of the two steels before and after tension were observed by means of Optical Microscope (OM), Scanning Electron Microscope (SEM), X-ray diffraction (XRD) and Transmission Electron Microscope (TEM). The results show that the two lightweight steels have a high strength and plasticity and exhibit excellent combinations of specific strength and ductility at the strain-rate of 0.001 s−1 after annealing at 850 ◦C for 5 min then directly quenching into water. During the tensile deformation process, the austenite in 3.5 Mn steel is transformed to α-martensite. While in 10 Mn steel, the austenite is transformed to twinning. With an increase in strain rate from 0.001 to 1200 s−1, tensile strength of the two steels increase, whilst the elongation initially decrease, and then increase. At the strain-rate of 450 s−1, the elongation of the two lightweight steels are minimal, and the energy absorption capacity are the lowest. With the deformation progresses, the value of n increases from small to large, the strain hardening effect becomes high. Uniform deformation of 10 Mn lightweight steel was suppressed at high strain-rate. Comparing with 10 Mn lightweight steel, the austenite in 3.5 Mn lightweight steel is obviously unstable and cannot provide progressive phase transition.

Item Type: Article
Uncontrolled Keywords: Strain rate, Manganese content, Deformation behavior, Lightweight steel, Retained austenite
Depositing User: Symplectic Admin
Date Deposited: 11 Nov 2020 11:09
Last Modified: 18 Jan 2023 23:22
DOI: 10.1016/j.jmrt.2020.08.020
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