Microstructures, Mechanical Properties, and Applications of TRIP/TWIP Steels

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 31 October 2024 | Viewed by 2315

Special Issue Editor


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School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Interests: material processing; high temperature alloys
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Special Issue Information

Dear Colleagues,

Ultra-high manganese steels containing 15–25 weight % Mn and with additions of Si and Al of ~2–4 weight % are characterized by a high-strength–high-ductility combination, excellent formability, and superior fracture toughness because of TRIP (transformation-induced plasticity) or TWIP (twinning-induced plasticity) effects. Fe-C-Mn alloys have relatively low stacking fault energy. The addition of Al and Si elements to the Fe–Mn alloys impacts their stacking fault energy and phase stability, leading to variable mechanical properties that are governed by the extent of deformation twinning and strain-induced martensitic transformation, namely, γ(fcc)→ε(hcp) and γ(fcc)→α(bct). Recent studies have indicated that the Fe–Mn–Al–Si alloy primarily exhibits a TRIP effect when the manganese content is less than 15 weight %, while the TWIP effect is dominant when manganese content is higher than 25 weight %. However, when the manganese content is 15–25 weight %, the TRIP and TWIP effects coexist. TRIP/TWIP steels are effective candidates for automotive sheet because they can reduce the weight of the automotive components, improve fuel efficiency, reduce emission, and enhance the degree of safety.

The Special Issue will include articles reporting new and progressive research results in the areas of medium Mn and high Mn steels, as well as reviews of particular classes of fundamental physics of the materials and their applications. Manuscripts will be welcomed from both fundamental scientific researchers and authors belonging to industrial companies involved in the field.

Prof. Dr. Zhengyou Tang
Guest Editor

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Keywords

  • microstructures
  • mechanical properties
  • TRIP
  • TWIP
  • medium Mn steel
  • high Mn steel
  • deformation mechanism

Published Papers (2 papers)

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Research

17 pages, 7027 KiB  
Article
Study on Mechanical Properties and Deformation Mechanism of Fe-28Mn-10Al-C High-Strength Steel during Dynamic Deformation Process
by Shanji Cao, Hanwen Zhang, Zhengyou Tang and Shuo Yu
Metals 2024, 14(1), 47; https://doi.org/10.3390/met14010047 - 29 Dec 2023
Viewed by 1002
Abstract
For the purpose of investigating the microstructure deformation of 28Mn-10Al-C steel at high speeds under different strain rates, the dynamic properties of 28Mn-10Al-C steel under varying strain rates and the feasibility of the tensile specimens with a variable cross-section were evaluated using a [...] Read more.
For the purpose of investigating the microstructure deformation of 28Mn-10Al-C steel at high speeds under different strain rates, the dynamic properties of 28Mn-10Al-C steel under varying strain rates and the feasibility of the tensile specimens with a variable cross-section were evaluated using a combination of tensile test, optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscope (SEM), and electron back scatter diffraction (EBSD). The test results demonstrate that the high-tension tensile process of 28Mn-10Al-C steel involves a competitive process of work hardening, deformation speed reinforcement, and adiabatic temperature elevation. The elasticity limit, tensile strength, and elongation of 28Mn-10Al-C steel increase with the rate of deformation. Specifically, at a deformation rate of 103 s−1, the yield strength, tensile strength, and elongation of the test steel increase to 817 MPa, 1047 MPa, and 60.6%, respectively, indicating significant improvements in all properties. Through analyzing its mechanical properties, dislocation density, and angle grain boundary density, this article discusses the deformation behavior of 28Mn-10Al-C steel during dynamic deformation. It is found that the dominant hardening mechanism and softening mechanism in the deformation process change with the increase in strain rate. Full article
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14 pages, 69208 KiB  
Article
Effects of Quenching Temperature on the Microstructure and Mechanical Properties of a Strip-Cast Medium-Mn Steel Processed by Quenching and Partitioning
by Cansheng Yu, Hesong Wang, Yuanxiang Zhang, Yunjie Li, Jian Kang and Zhiyuan Chang
Metals 2023, 13(10), 1772; https://doi.org/10.3390/met13101772 - 19 Oct 2023
Viewed by 952
Abstract
Twin-roll strip casting (TRSC), which is a low-energy and short process to produce strip steel, is a potential approach to produce advanced high-strength steels. Herein, a medium-Mn steel containing 4 wt% Mn was processed using a novel route involving TRSC, hot rolling and [...] Read more.
Twin-roll strip casting (TRSC), which is a low-energy and short process to produce strip steel, is a potential approach to produce advanced high-strength steels. Herein, a medium-Mn steel containing 4 wt% Mn was processed using a novel route involving TRSC, hot rolling and quenching and partitioning (QP) to explore the possibility of medium-Mn steel produced by TRSC plus QP process. The effects of quenching temperature on the microstructure and mechanical properties were studied. It was found that primary martensite and retained austenite (RA) were obtained at the quenching temperature of 140–180 °C, while primary martensite, RA and secondary martensite were obtained when the quenching temperature was 220–300 °C. With an increase in quenching temperature from 140 to 260 and to 300 °C, the RA fraction first increased from 15.4% to 31.8% and then decreased to 16.6%. The sample at a quenching temperature of 220 °C yielded mechanical properties with a yield strength of 992 MPa, tensile strength of 1159 MPa and total elongation of 20.4%. The superior mechanical properties were achieved by an optimum combination of high RA fraction (26.5%), appropriate mechanical stability of RA and a small number of the islands of secondary martensite and RA. Hence, the present study provides a viable processing route for medium-Mn steel. Full article
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