Progress in Advanced High-Strength Steels

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Mechanical Engineering".

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 5442

Special Issue Editors

Department of Mechanical Engineering, University of Coimbra, 3030-788 Coimbra, Portugal
Interests: structural integrity; fatigue; fracture mechanics; finite element method; fiber-reinforced composites; environmental effects; additive manufacturing
Special Issues, Collections and Topics in MDPI journals
Department of Chemical Engineering, Materials and Environment, Sapienza University of Rome, 00184 Rome, Italy
Interests: fatigue and fracture behavior of materials; mechanical characterization; structural integrity of conventional and innovative materials
Special Issues, Collections and Topics in MDPI journals
School of Mechanical Engineering, University of Adelaide, Adelaide, SA 5005, Australia
Interests: solid mechanics; fracture mechanics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Modern industry, driven by economic and environmental factors, faces an urgent need to improve its efficiency, safety, and reliability. Despite the constant development of new materials, advanced high-strength steels remain key materials in this competitive scenario, mainly because of their balanced features, in particular the low cost, excellent strength-to-weight ratio, high corrosion resistance, good machinability, and competitive production costs, among others.

This Special Issue aims to foster the dissemination of high-quality research focused on the relationship between the mechanical behaviour and the processing methods, microstructure properties, and chemical composition. Original contributions or review papers, dealing with the structural response, failure mechanisms, heat treatment strategies, processing methods, and alloying element design of advanced high-strength steels, are encouraged.  

Prof. Dr. Ricardo Branco
Prof. Dr. Filippo Berto
Prof. Dr. Andrei Kotousov
Guest Editor

Manuscript Submission Information

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Keywords

  • Advanced high-strength steels
  • Ultra high-strength steels
  • Dual-phase steels
  • Complex-phase steels
  • Transformation-induced plasticity steels
  • Bainitic steels

Published Papers (2 papers)

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Research

11 pages, 2805 KiB  
Article
Laboratory- and Semi-Industrial-Scale Thermomechanical Processing of TRIP-Aided Steel with Acicular Ferrite
by Adam Skowronek and Adam Grajcar
Appl. Sci. 2021, 11(20), 9512; https://doi.org/10.3390/app11209512 - 13 Oct 2021
Cited by 2 | Viewed by 1327
Abstract
The modification of the deformation and cooling methods resulting in the obtainment of acicular ferrite promotes an increase in the proportion of retained austenite (RA) and a corresponding increase in mechanical properties in Si-Al TRIP-aided steel. The effect of controlled thermomechanical processing in [...] Read more.
The modification of the deformation and cooling methods resulting in the obtainment of acicular ferrite promotes an increase in the proportion of retained austenite (RA) and a corresponding increase in mechanical properties in Si-Al TRIP-aided steel. The effect of controlled thermomechanical processing in laboratory- and semi-industrial scales on the possibility of obtaining acicular ferrite and a high fraction of retained austenite was investigated. The steel was hot deformed in three steps: at 1050, 900 and 750 °C to introduce dislocations into the hot-deformed pancake austenite. Next, slow cooling in a ferritic transformation region was performed, followed by isothermal holding of steel at 450 °C. The interrupted tensile tests at the strain levels of 5, 10 and 15% were performed to investigate the mechanical properties response and the stability of the obtained retained austenite. Light and scanning electron microscopy, XRD and EBSD analyses were performed to assess microstructural features. The produced material showed a multiphase microstructure containing acicular ferrite and 10% of retained austenite. The microstructures obtained in both production methods were slightly different due to high temperature inertia in the semi-industrial process. Full article
(This article belongs to the Special Issue Progress in Advanced High-Strength Steels)
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11 pages, 2066 KiB  
Article
Fatigue Life Assessment in Bainitic Steels Based on The Cumulative Strain Energy Density
by Rui F. Martins, Ricardo Branco and Xiaoyan Long
Appl. Sci. 2020, 10(21), 7774; https://doi.org/10.3390/app10217774 - 03 Nov 2020
Cited by 10 | Viewed by 2535
Abstract
Carbide-free bainitic steels are an example of high-strength steels that show an excellent combination of strength, ductility, toughness and rolling fatigue contact resistance and are progressively being introduced in the production of railways, crossings and automotive components. Although there are Mn-free approaches able [...] Read more.
Carbide-free bainitic steels are an example of high-strength steels that show an excellent combination of strength, ductility, toughness and rolling fatigue contact resistance and are progressively being introduced in the production of railways, crossings and automotive components. Although there are Mn-free approaches able to produce carbide-free bainitic steels, those based on the addition of Mn are less expensive. Therefore, it is important to fully understand the mechanical behavior of such materials to develop reliable engineering products. In this paper, three low-carbon bainitic steels, differing in Mn content, namely 0%, 2.3% and 3.2%, designated as steel A, B and C, respectively, were studied in a systematic manner. Low-cycle fatigue tests were conducted under symmetrical strain-controlled conditions for different strain amplitudes (0.6%, 0.7%, 0.8% and 1%). Independent of Mn content, a strong relationship between cumulative strain energy density and number of cycles to failure was found. Based on this relationship, a new predictive model, capable of estimating the fatigue lifetime, was developed. Predictions based on the new model were close to the experimental lives and were more accurate than those computed via the well-known Smith-Watson-Topper (SWT) and Liu criteria. Full article
(This article belongs to the Special Issue Progress in Advanced High-Strength Steels)
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