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Metals
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Recent Development in Advanced High Strength Steel
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Recent Development in Advanced High Strength Steel

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

Deadline for manuscript submissions: closed (31 May 2022) | Viewed by 9951

Special Issue Editor

Dr. Ludmila Kučerová

E-Mail Website
Guest Editor
Regional Technological Institute, University of West Bohemia, Univerzitni 8, 30614 Plzen, Czech Republic
Interests: the relationship between processing parameter microstructures and the mechanical properties of metals; microstructure analysis of metals with light and scanning electron microscopy; additively manufactured metals; advanced high-strength steels; in situ testing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Advanced high-strength steels (AHSSs) encompass a large and continuously growing group of steels based on various alloying concepts, usually developed together with dedicated heat or thermo-mechanical treatment methods. The development of AHSSs started from low-carbon low-alloyed TRIP (transformation-induced plasticity) steels and continued to medium-carbon martensitic steels suitable for quenching and partitioning process, medium- and high-alloyed manganese steels, and low-density steels. The birth and development of these steels responded to the demands of the automotive industry for materials with improved strength-to-ductility ratio, which would help to decrease production costs, vehicle weight, fuel consumption, and thus carbon footprint. Besides the formally recognized groups of AHSSs, materials, and processing ideas have been re-developed beyond the boundaries of these established classes, and novel material and technological concepts have appeared to produce even better mechanical or technological properties. This makes the advanced high-strength steels an important and dynamically developing research field.

In this Special Issue, we seek to provide a wide set of articles on various aspects of high-strength steels. The idea is to demonstrate the broad range of microstructures, properties, and applications of these steels. Hopefully, this open-access Issue will provide a platform offering researchers information about the current state-of-the-art and latest developments in this interesting field. Articles on the production methods, development of new materials, microstructure characterization and phase transformation analysis, as well as mechanical and technological properties of advanced high-strength steels are desired. Articles describing the relationship among processing parameters and the resulting microstructures and properties are also expected.

Assoc. Prof. Ludmila Kučerová
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

  • advanced high-strength steels
  • TRIP steels
  • quenching and partitioning
  • medium and high Mn steels
  • low-density steels
  • heat and thermo-mechanical treatment
  • hot stamping
  • microstructure characterization
  • mechanical and technological properties

Published Papers (4 papers)

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Research

17 pages, 6455 KiB  
Article
The Influence of Varying Aluminium and Manganese Content on the Corrosion Resistance and Mechanical Properties of High Strength Steels
by Jan Hajšman, Ludmila Kučerová and Karolína Burdová
Metals 2021, 11(9), 1446; https://doi.org/10.3390/met11091446 - 13 Sep 2021
Cited by 5 | Viewed by 2279
Abstract
The aim of this paper is to evaluate the influence of small variations in chemical composition on the corrosion resistance and mechanical properties of low-manganese and medium manganese high strength steels. Six different steels with manganese content varying from 1.5 to 4.0 wt.% [...] Read more.
The aim of this paper is to evaluate the influence of small variations in chemical composition on the corrosion resistance and mechanical properties of low-manganese and medium manganese high strength steels. Six different steels with manganese content varying from 1.5 to 4.0 wt.% and aluminium from 0.008 to 6.5 wt.% were subjected to the analysis. The other subjects for evaluation included the effect of aluminium as a replacement for silicon, niobium microalloying and the effect of heat treatment. The effect of non-metallic inclusions on localized corrosion initiation and propagation was also documented. Using potentiodynamic testing, exposure testing, tensile and impact testing, it was found that the improvement in corrosion resistance associated with increasing aluminium content is accompanied by a significant deterioration of the mechanical properties. Niobium microalloying and heat treatment was found to have no quantifiable impact on the anti-corrosion properties. The effect of aluminium content proved to be superior to the effect of nonmetallic inclusions in terms of determining the overall corrosion resistance of the experimental steels. Full article
(This article belongs to the Special Issue Recent Development in Advanced High Strength Steel)
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11 pages, 3951 KiB  
Article
Determining Forming Limit Diagrams Using Sub-Sized Specimen Geometry and Comparing FLD Evaluation Methods
by Kateřina Rubešová, Martin Rund, Sylwia Rzepa, Hana Jirková, Štěpán Jeníček, Miroslav Urbánek, Ludmila Kučerová and Pavel Konopík
Metals 2021, 11(3), 484; https://doi.org/10.3390/met11030484 - 14 Mar 2021
Cited by 7 | Viewed by 3417
Abstract
Sheet metal forming boundaries are established using the forming limit diagram (FLD). The Nakajima and Marciniak tests, which are based on stretching a material using a punch, are the most commonly used methods for determining the FLD or fracture forming limit diagram (FFLD). [...] Read more.
Sheet metal forming boundaries are established using the forming limit diagram (FLD). The Nakajima and Marciniak tests, which are based on stretching a material using a punch, are the most commonly used methods for determining the FLD or fracture forming limit diagram (FFLD). The results are usually evaluated by calculating local strain, strain rates, specimen thickness reduction or fracture strain. When the amount of experimental material is insufficient, miniaturization of the testing specimens may be a solution. However, the interchangeability of the results for standard and miniaturized specimens has not been proven yet. In this study, the Nakajima tests were performed using standard and sub-sized specimens made of manganese–boron steel 22MnB5, commonly used in the automotive industry. Afterwards, four FLD/FFLD evaluation methods were applied and compared. The miniaturized specimens yielded higher strain values, which was explained by the varied ratio of material thickness/punch diameter and different bending conditions. The highest compliance of the results was recorded for the standard and miniaturized FFLD. Full article
(This article belongs to the Special Issue Recent Development in Advanced High Strength Steel)
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12 pages, 5005 KiB  
Article
Cleavage Stress Producing Notch-Induced Anisotropic Fracture and Crack Path Deflection in Cold Drawn Pearlitic Steel
by Jesús Toribio and Francisco-Javier Ayaso
Metals 2021, 11(3), 451; https://doi.org/10.3390/met11030451 - 9 Mar 2021
Cited by 2 | Viewed by 1659
Abstract
The fracture performance of axisymmetric notched samples taken from pearlitic steels with different levels of cold-drawing is studied. To this end, a real manufacture chain was stopped in the course of the process (on-site in the factory), and samples of all intermediate stages [...] Read more.
The fracture performance of axisymmetric notched samples taken from pearlitic steels with different levels of cold-drawing is studied. To this end, a real manufacture chain was stopped in the course of the process (on-site in the factory), and samples of all intermediate stages were extracted from the initial hot-rolled bar (not cold-drawn at all) to the final commercial product (prestressing steel wire). Thus, the drawing intensity or straining level (represented by the yield strength) is treated as the key variable to elucidate the consequences of manufacturing on the posterior fracture issues. On the basis of a materials science approach, the clearly anisotropic fracture behavior of heavily drawn steels (exhibiting deflection in the fracture surface) is rationalized on the basis of the markedly oriented pearlitic microstructure of the cold-drawn steel that influences the operative micromechanism of fracture. In addition, a finite element analysis of the stress distribution at the fracture instant allows the computation of the cleavage annular stress required to produce anisotropic fracture behavior and thus crack path deflection associated with mixed-mode cracking. Results show that such a stress is the variable governing initiation and propagation of anisotropic fracture by cleavage (a specially oriented and enlarged cleavage fracture) appearing along the wire axis direction in the case of sharply-notched samples of heavily drawn pearlitic steels. Full article
(This article belongs to the Special Issue Recent Development in Advanced High Strength Steel)
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10 pages, 5222 KiB  
Article
Hot Rolling vs. Forging: Newly Developed Fe-Al-O Based OPH Alloy
by Omid Khalaj, Hana Jirková, Karolína Burdová, Adam Stehlík, Ludmila Kučerová, Jiří Vrtáček and Jiří Svoboda
Metals 2021, 11(2), 228; https://doi.org/10.3390/met11020228 - 28 Jan 2021
Cited by 7 | Viewed by 1690
Abstract
Two oxide precipitation hardened (OPH) Fe-Al-O-based steels were prepared by mechanical alloying. In addition to the variant using yttria nano-precipitates to improve the mechanical properties, a variant using only alumina precipitates for strengthening was also prepared. Therefore, a more economically acceptable variant of [...] Read more.
Two oxide precipitation hardened (OPH) Fe-Al-O-based steels were prepared by mechanical alloying. In addition to the variant using yttria nano-precipitates to improve the mechanical properties, a variant using only alumina precipitates for strengthening was also prepared. Therefore, a more economically acceptable variant of these steels was developed. Hot consolidation is a significant production step for achieving the required mechanical properties. Hot consolidation was performed by either hot rolling or forging. The heat treatment was subsequently performed on both variants (0.85Fe–0.11Al–0.03Y2O3–0.01Y and 0.87Fe–0.11Al–0.02O2) of the alloys to support secondary recrystallization. The paper describes the influence of the consolidation method on grain size, material recrystallization, and mechanical properties. The difference in the consolidation method was reflected in the grain size after the heat treatment, where the material consolidated by hot rolling reached a grain size of almost 200 μm, while after forging the maximum grain size was around 30 μm. A higher ultimate tensile strength was achieved with forged states, both with and without the heat treatment. Full article
(This article belongs to the Special Issue Recent Development in Advanced High Strength Steel)
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