Microstructural evolution and deformation behavior of twinning-induced plasticity (TWIP) steel during wire drawing

Hwang, Joong‐Ki; Yi, Il-Cheol; Son, Il‐Heon; Yoo, Jang-Yong; Kim, Byoungkoo; Zargaran, Alireza; Kim, Nack J.

doi:10.1016/j.msea.2015.07.034

Cited by 60 publications

(22 citation statements)

References 58 publications

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“…1,2) TWIP steel shows the special features by the addition of various alloying elements such as Mn (15-20 mass%), Al (1-3 mass%), Si (~0.3 mass%) and C (0.4-0.6 mass%). 3,4) However, such high Mn and Al concentration in steel will significantly change the physicochemical conditions of non-metallic inclusion formation during steelmaking and casting processes compared to the conventional Al-killed steels containing ~1% Mn and 0.03-0.05% Al.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of Nitrogen Solubility and AlN Formation in Multi-Component High Mn Steel Melts

2017

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Thermodynamics of nitrogen and AlN formation in multi-component liquid iron alloys containing Mn, Al, Si and C was investigated by the metal/gas and the metal/nitride/gas equilibration techniques under reduced nitrogen partial pressures in Ar-N 2 gas mixture. The N solubility was measured in binary Fe-Mn and Fe-Si alloy melts, and ternary Fe-Mn-Si, Fe-Al-Si, Fe-Mn-C and Fe-Si-C alloy melts over wide composition range at 1 773-1 873 K. Using Wagner's formalism, the effect of alloying elements on the N solubility was described as the first-and second-order interaction parameters as well as the second-order cross-product parameters. The validity of the interaction parameters determined in the present study was checked by measuring the N solubility and AlN solubility product for a typical TWIP steel composition melt of Fe-25% Mn-0.3% Si-0.6% C-Al at 1 723-1 873 K.

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Section: Introductionmentioning

confidence: 99%

Thermodynamics of Nitrogen Solubility and AlN Formation in Multi-Component High Mn Steel Melts

2017

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“…In the IQ maps, parallel black lines inside austenite grain were Σ3 twin boundaries. 13) The twins were not clearly observed owing to the high deformation of these specimens, but they could provide helpful information about the tendency of deformation twinning. Regardless of pass schedule and area, most of the grains had deformation twin.…”

Section: Analysis Of Mechanical Properties and Microstruc-mentioning

confidence: 92%

“…Recently, Hwang et al suggested that twinning-induced plasticity (TWIP) steel is a promising material for high strength wire rod products 13,14) including flat-rolled wire applications 15) because TWIP steels meet the strict property requirements for wire rod products originating from their outstanding combination of strength and ductility. [16][17][18][19][20][21][22][23][24] Moreover, TWIP steels have a higher resistance to hydrogen-delayed fracture in comparison with conventional plain carbon steels that are typically used for wire rod applica-tions.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Homogeneity of a Flat-rolled Wire in Twinning-induced Plasticity Steel Using the Pass Schedule Design

Hwang

2020

ISIJ Int.

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The effects of reduction in height per pass, roll diameter, and friction coefficient on the homogeneity of mechanical properties and shape change in flat-rolled twinning-induced plasticity steel wire were investigated. The goal was to improve the homogeneity of mechanical properties of a wire with area during flat rolling process using a numerical simulation, a hardness test, and electron backscatter diffraction techniques. Reduction in height per pass and roll diameter had large influences on both strain inhomogeneity and lateral spread of flat-rolled wire. Strain inhomogeneity and lateral spread increased with increasing the reduction in height per pass and roll diameter due to the higher length of the contact area. The underlying mechanism for the strain inhomogeneity and lateral spread of flat-rolled wire was highly related to the length of contact area. Hence, the length of the contact area needed reduction through controlling process conditions to improve the strain homogeneity of the flat-rolled wire. The effect of friction coefficient on lateral spread was negligible, whereas strain inhomogeneity slightly increased with friction coefficient. The combination of high and low reduction in height per pass with a smaller roll diameter improved the homogeneity of mechanical properties and microstructure over the area of the flat-rolled wire. Based on the results of numerical simulation and experimental test, a new practical strategy is proposed to achieve greater homogeneity of mechanical properties over the area of flat-rolled wire, which could be of great applicability in industrial fields.

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“…Its segregation may lead to undesirable phase transformations during the welding cycle, especially martensitic transformation due to its high C content. Martensitic transformation may be undesirable in TWIP steels for three main reasons: (i) it is a source of tensile residual stresses, as volumetric changes are associated with it, (ii) the material may lose its twinning capacity, which is responsible for the combination of high strength and ductility that characterizes the material and (iii) martensite transformationimpairs toughness and also may facilitate the occurrence of delayed fracture, which has also been reported for TWIP steels [13][14][15]. As can be seen in Erro!…”

Section: 1microstructural Features Of the Weld Spotsmentioning

confidence: 96%

Características Microestruturais, Modos De Falha E Propriedades Mecânicas De Aços Twip Soldados Por Soldagem a Ponto Por Resistência

Colombo¹,

Santos²,

Otubo³

et al. 2019

ABM Proceedings

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Resumo Chapas de aço TWIP980 foram soldadas por soldagem a ponto por resistência com diferentes parâmetros de processo. A microestrutura pós-soldagem foi caracterizada e as propriedades mecânicas das juntas soldadas foram avaliadas. Para cada condição de processo, os modos de falha foram identificados e correlacionados com as propriedades mecânicas. Não foram identificadas regiões de segregação de manganês, indicando que o material pós-soldado mantém sua microestrutura austenítica, o que foi confirmado por difractogramas de raios-x e micrografias ópticas.Mapas de microindentação mostraram uma distribuição heterogênea de propriedades mecânicas ao longo da junta soldada. Além disto, a região mais macia localiza-se na zona de fusão da solda, favorecendo modos de falha frágeis, o que foi identificado através de ensaios mecânicos de tração-cisalhamento. No entanto, ajustes de parâmetros de processo mostraram-se eficazes para promover outros modos de falhas, inclusive falha dúctil, o que foi confirmado através de micrografias eletrônicas. Os resultados também mostraram que a resistência mecânica e a capacidade de absorção de energia das juntas estão diretamente relacionados com os parâmetros de processo e modos de falha.

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Microstructural evolution and deformation behavior of twinning-induced plasticity (TWIP) steel during wire drawing

Cited by 60 publications

References 58 publications

Thermodynamics of Nitrogen Solubility and AlN Formation in Multi-Component High Mn Steel Melts

Thermodynamics of Nitrogen Solubility and AlN Formation in Multi-Component High Mn Steel Melts

Enhanced Homogeneity of a Flat-rolled Wire in Twinning-induced Plasticity Steel Using the Pass Schedule Design

Características Microestruturais, Modos De Falha E Propriedades Mecânicas De Aços Twip Soldados Por Soldagem a Ponto Por Resistência

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