Adjusting the microstructure evolution, mechanical properties and deformation behaviors of Fe-5.95Mn-1.55Si-1.03Al-0.055C medium Mn steel by cold-rolling reduction ratio
Adjusting the microstructure evolution, mechanical properties and deformation behaviors of Fe-5.95Mn-1.55Si-1.03Al-0.055C medium Mn steel by cold-rolling reduction ratio
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冷轧压下量调节Fe-5.95Mn-1.55Si-1.03Al-0.055C中锰钢组织演变、力学性能和变形行为
DOI：
10.1016/j.jmrt.2019.11.058
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发表时间：
2020-03-01
影响因子：
6.4
通讯作者：
Liu, Xianghua
中科院分区：
文献类型：
--
作者：
Yan, Shu;Li, Tianle;Liu, Xianghua
For a representative medium Mn steel with the actual chemical composition of Fe-5.95 Mn1.55Si-1.03Al-0.055 C (wt. %), the effect of cold-rolling deformation on microstructural evolution and mechanical properties was investigated systematically. The thickness of coarse 6-ferrite grains decreases with the increase of cold-rolling reduction, and when the cold-rolling reduction ratio reaches up to a certain value, these 6-ferrite grains can be broken into small pieces due to the severe plastic deformation. Additionally, a critical cold-rolling reduction ratio for recrystallization exists. Below this critical reduction value, the medium Mn steel after austenite reverted transformation (ART) annealing remains lath-shaped structure originating from the initial martensitic morphology, and when recrystallization occurs, however, submicron equiaxed grains dominate. The initial microstructure before ART annealing, which is usually determined by cold-rolling reduction, strongly influences not only the martensitic/ferritic matrix, but also reverted austenite grains. Nonrecrystallization matrix promotes the formation of acicular reverted austenite, whereas recrystallization forces the austenite grains spherical and promotes the grain size of austenite homogenizing. Under the situation of non-recrystallization, the cold-rolling reduction prior to ART annealing only has a negligible effect on the final mechanical properties. However, the occurrence of recrystallization results in not only the yielding plateau, i.e., discontinuous yielding, but also the remarkable increase of yield strength. (C) 2019 Published by Elsevier B.V.
