Metals

Journal Browser

► Journal Browser

Special Issue Editor

Prof. Dr. Jinkyung Kim

E-Mail Website
Guest Editor

Department of Materials Science and Chemical Engineering, Hanyang University, Ansan, South Korea
Interests: advanced high strength steel; microstructure; mechanical properties; deformation behavior; phase transformation

Special Issue Information

Dear Colleagues,

Twinning-induced plasticity steel (TWIP) is a second-generation advanced high strength steel characterized by a superior combination of strength and ductility. In the past decade, there has been considerable progress in scientific and industrial developments of twinning-induced plasticity (TWIP) steel. Despite that considerable progress in understanding the microstructure–property relationship of TWIP steels, however, some critical issues still remain to be addressed. Novel microstructure design to increase the yield strength of TWIP steels is essential. In this regard, theoretical studies on stacking fault energy and precipitation are required for the optimal design of microstructures. Microstructure evolution during deformation of TWIP steels should be systematically studied to understand the role of each deformation mechanism on the strain hardening behavior of the material. Especially the role of carbon on microstructures and deformation mechanisms of TWIP steels is not yet clear. A clear understanding of microstructure evolution should lead to the development of more reliable micromechanical models on the deformation behavior of TWIP steels. The microstructure evolution during complex forming operations and the prediction of formability are also important subjects. Fundamental research on hydrogen-delayed fracture mechanisms is also required.

Thus, this Special Issue focuses on microstructural evolution and phase transformation in TWIP steels, which will lead to progress in understanding complex microstructure evolution of TWIP steels and the development of novel TWIP steels with superior mechanical properties.

Prof. Dr. Jinkyung Kim
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

TWIP steel
Microstructure
Mechanical properties
Deformation mechanisms
Phase transformation
Stacking fault energy
Delayed fracture
Deformation twinning
Micromechanical model

Published Papers (2 papers)

Download All Papers

Research

Jump to: Review

13 pages, 4826 KiB

Open AccessArticle

Tailoring Extra-Strength of a TWIP Steel by Combination of Multi-Pass Equal-Channel Angular Pressing and Warm Rolling

by Marina Abramova, Arseniy Raab, Ruslan Z. Valiev, Anna Khannanova, Chong Soo Lee, Jae Nam Kim, Gyeong Hyeon Jang, Jung Gi Kim, Hyoung Seop Kim, Oliver Renk and Nariman Enikeev

Metals 2021, 11(3), 518; https://doi.org/10.3390/met11030518 - 22 Mar 2021

Cited by 13 | Viewed by 2482

Abstract

Increasing the yield stress of twinning-induced plasticity (TWIP) steels is a demanding task for modern materials science. This aim can be achieved by microstructure refinement induced by heavy straining. We feature the microstructural evolution and mechanical performance of a high-manganese TWIP steel subjected to deformation treatment by different combinations of equal channel angular pressing (ECAP) and rolling at different temperatures. The effect of microstructure on the tensile properties of the steel subjected to the multi-pass ECAP process and to subsequent rolling is reported as well. We show that the combined deformation procedure allows us to further increase the strength of the processed workpieces due to a gradual transition from a banded structure to a heterogeneous hierarchical microstructure consisting of fragments, dislocation configurations and nano- and micro-twins colonies. Rolling of multi-pass ECAP specimens at 375 °C allowed us to achieve an extraordinary strength, the highest among all the investigated cases, while the best trade-off between yield strength and elongation to failure was reached using multi-pass ECAP followed by rolling at 500 °C. This study shows a great potential of using combined deformation techniques to enhance the mechanical performance of TWIP steels. Full article

(This article belongs to the Special Issue Microstructural Evolution and Phase Transformation in TWIP Steel)

► Show Figures

Graphical abstract

Review

Jump to: Research

11 pages, 1818 KiB

Open AccessFeature PaperReview

An Overview of High Yield Strength Twinning-Induced Plasticity Steels

by Guanghui Yang and Jin-Kyung Kim

Metals 2021, 11(1), 124; https://doi.org/10.3390/met11010124 - 10 Jan 2021

Cited by 21 | Viewed by 4260

Abstract

Twinning-induced plasticity (TWIP) steel is a second-generation advanced high strength steel grade developed for automotive applications. TWIP steels exhibit an excellent combination of strength and ductility, mainly originating from the activation of deformation twinning. However, TWIP steels generally exhibit a relatively low yield strength (YS), which limits their practical applications. Thus, developing high YS TWIP steels without ductility loss is essential to increase their industrial applications. The present work summarizes and discusses the recent progress in improving the YS of TWIP steels, in terms of precipitation strengthening, solid solution strengthening, thermomechanical processing, and novel processes. Novel processes involving sub-boundary strengthening, multi-phase structure, and gradient structure as well as the control of thermomechanical processing (recovery annealing and warm rolling) and precipitation strengthening were found to result in an excellent combination of YS and total elongation. Full article

(This article belongs to the Special Issue Microstructural Evolution and Phase Transformation in TWIP Steel)

► Show Figures