Effect of Cold Rolling on the Microstructural Evolution and Mechanical Properties of Fe-25Mn-3Si-3Al-0.3Nb TWIP Steel

The microstructural evolution, deformation mechanism and mechanical properties of Fe-25Mn-3Si-3Al-0.3Nb steel in the process of cold rolling were studied by optical microscopy, scanning microscopy, transmission electron microscopy, X-ray diffractometry, tensile testing and microhardness tests. A hig...

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Veröffentlicht in:Coatings (Basel) 2022-07, Vol.12 (7), p.900
Hauptverfasser: Li, Dejun, Guo, Jianhua, He, Fei, Feng, Yaorong, Guo, Dashan, Ren, Fengzhang, Cao, Feng, Yang, Qi, Shi, Wei
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container_issue 7
container_start_page 900
container_title Coatings (Basel)
container_volume 12
creator Li, Dejun
Guo, Jianhua
He, Fei
Feng, Yaorong
Guo, Dashan
Ren, Fengzhang
Cao, Feng
Yang, Qi
Shi, Wei
description The microstructural evolution, deformation mechanism and mechanical properties of Fe-25Mn-3Si-3Al-0.3Nb steel in the process of cold rolling were studied by optical microscopy, scanning microscopy, transmission electron microscopy, X-ray diffractometry, tensile testing and microhardness tests. A high-density dislocation structure and a small number of strain-induced twins appeared in the microstructure of the steel at 30% strain. At 50% strain, the strain-induced twins in austenite increased conspicuously, and the lamella thickness of the twins decreased. At 70% strain, the original grains were clearly refined by the micro-shear bands and twinning intersections to form a large number of sub-grains, and some sub-grains were at the nanoscale. The steel still remained a single-phase austenite during cold rolling even if the strain was as high as 70%. The plastic deformation mechanism of the steel was not changed through the addition of 0.3 wt.% Nb, and both dislocation slipping and twinning were still the fundamental plastic deformation mechanisms for the steel. Furthermore, cold rolling led to a drastic rise in the strength and hardness of the steel, but a remarkable decrease in the elongation. The characteristics of micropore aggregation fractures could always be observed on the fracture surface of static tensile specimens with various strains.
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A high-density dislocation structure and a small number of strain-induced twins appeared in the microstructure of the steel at 30% strain. At 50% strain, the strain-induced twins in austenite increased conspicuously, and the lamella thickness of the twins decreased. At 70% strain, the original grains were clearly refined by the micro-shear bands and twinning intersections to form a large number of sub-grains, and some sub-grains were at the nanoscale. The steel still remained a single-phase austenite during cold rolling even if the strain was as high as 70%. The plastic deformation mechanism of the steel was not changed through the addition of 0.3 wt.% Nb, and both dislocation slipping and twinning were still the fundamental plastic deformation mechanisms for the steel. Furthermore, cold rolling led to a drastic rise in the strength and hardness of the steel, but a remarkable decrease in the elongation. The characteristics of micropore aggregation fractures could always be observed on the fracture surface of static tensile specimens with various strains.</description><identifier>ISSN: 2079-6412</identifier><identifier>EISSN: 2079-6412</identifier><identifier>DOI: 10.3390/coatings12070900</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Austenite ; Cold ; Cold rolling ; Deformation ; Deformation mechanisms ; Dislocation density ; Ductility ; Edge dislocations ; Elongation ; Evolution ; Fracture surfaces ; Grain boundaries ; Grains ; Hot rolling ; Lamella ; Manufacturing ; Mechanical properties ; Mechanical twinning ; Microhardness ; Microstructure ; Optical microscopy ; Plastic deformation ; Scanning microscopy ; Shear bands ; Stainless steel ; Stress concentration ; Temperature ; Tensile tests ; TWIP steels ; Yield stress</subject><ispartof>Coatings (Basel), 2022-07, Vol.12 (7), p.900</ispartof><rights>2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). 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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; MDPI - Multidisciplinary Digital Publishing Institute; Alma/SFX Local Collection
subjects Austenite
Cold
Cold rolling
Deformation
Deformation mechanisms
Dislocation density
Ductility
Edge dislocations
Elongation
Evolution
Fracture surfaces
Grain boundaries
Grains
Hot rolling
Lamella
Manufacturing
Mechanical properties
Mechanical twinning
Microhardness
Microstructure
Optical microscopy
Plastic deformation
Scanning microscopy
Shear bands
Stainless steel
Stress concentration
Temperature
Tensile tests
TWIP steels
Yield stress
title Effect of Cold Rolling on the Microstructural Evolution and Mechanical Properties of Fe-25Mn-3Si-3Al-0.3Nb TWIP Steel
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