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Advanced High-Strength Steels (AHSS) Prepared as Bulk and Powder Metal

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: 20 December 2024 | Viewed by 1063

Special Issue Editor


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Guest Editor
Bodva Industry and Innovation Cluster (BIIC), Budulov 174,04501 Moldava nad Bodvou, Kosice, Slovakia
Interests: plastic deformation; materials properties; microstructures; ultrafine-grained structures; nanostructures; additive manufacturing; cryorolling
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Special Issue Information

Dear Colleagues,

Advanced High Strength Steels (AHSS) are characterized by selected chemical composition, final microstructures, and physical properties that can be formed in bulk or powdered steel materials.

The steel properties in bulk form are formed via a controlled process of heating and plastic deformations in austenitic regions, with the possibility of continuing deformations in the dual phase region (γ + α), followed by controlled cooling. The processes of recrystallization, precipitation, and phase transformations are controlled by time-dependent thermal-deformation regimes, which influence the final mechanical properties.

Nowadays, trends in production are directed towards creating products by methods enabling the achievement of shapes and geometric dimensions near the final product using additive manufacturing (AM) techniques for steels prepared by powder metallurgy.

To increase the mechanical properties and minimize the density of the PM material, plastic deformations realized as SPD techniques (severe plastic deformation) or deformations realized in cryogenic temperatures with the possibility of heat treatment are used as post-processing techniques after AM. The accumulation of these techniques controls the processes of recrystallization, precipitation, and phase transformations, as well as the strengthening contributions to yield strength and optimization of plastic properties.

The yield strength, tensile strength, and area reduction depend on the control of the strengthening contributions (grain size refinement, precipitation strengthening, dislocation strengthening, and transformation strengthening).

This Special Issue aims to present the latest works in the research and development of AHSS steels. We invite you to submit a manuscript to this Special Issue. Full papers, communications, and reviews are welcome for submission.

Potential topics include, but are not limited to:

(a) Materials base: AHSS steels prepared in bulk and PM form (introduction and characterization);

(b) Experimental techniques: controlled rolling and cooling, additive manufacturing, SPD techniques, plastic deformations at cryogenic temperatures, and heat treatment;

(c) Strengthening mechanisms to increase mechanical properties;

(d) New trends to increase mechanical properties;

(e) Application of AHSS.

Prof. Dr. Tibor Kvačkaj
Guest Editor

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Keywords

  • AHSS
  • recrystallization
  • precipitation
  • phase transformation
  • structures with dimensions at the level of micro and nano size
  • grain size dimensions
  • mechanical properties
  • plastic deformations
  • deep drawing
  • additive manufacturing
  • SPD techniques
  • heat treatment

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Published Papers (1 paper)

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Research

17 pages, 15080 KiB  
Article
Increasing the Strength and Impact Toughness of Carbon Steel Using a Nanosized Eutectoid Resulting from Time-Controlled Quenching
by Michail Brykov, Dariusz Mierzwiński, Vasily Efremenko, Vasyl’ Girzhon, Vadim Shalomeev, Oleksandr V. Shyrokov, Ivan Petryshynets, Olexandr Klymov and Oleksii Kapustyan
Materials 2024, 17(15), 3696; https://doi.org/10.3390/ma17153696 - 26 Jul 2024
Viewed by 709
Abstract
High-carbon steels are normally used as tool materials. The use of such steels for construction is limited due to their increased brittleness and poor weldability. However, it appears that high-carbon steels possess certain hidden reserves for enhanced plasticity and strength if properly heat-treated. [...] Read more.
High-carbon steels are normally used as tool materials. The use of such steels for construction is limited due to their increased brittleness and poor weldability. However, it appears that high-carbon steels possess certain hidden reserves for enhanced plasticity and strength if properly heat-treated. An unconventional heat treatment was applied to carbon eutectoid steel (0.8 wt.% C) in order to increase its strength and impact toughness simultaneously. Samples for tensile and impact testing were held at 800 °C for different time ranges from 3 min to 9 min with subsequent cooling in oil. It was established that for each type of sample, an optimal holding time exists that is responsible for increased strength and high impact toughness. The hardness and microhardness levels of the surface and under-surface regions of the samples reached 390 HV after optimal heat treatment. An X-ray revealed a shift of the (211)α-peak to the lower 2-theta angles after heat treatment with the optimal holding time; this indicates an increase in carbon content in alpha solid solutions of approximately 0.12 wt.%. Thus, a nanostructured mixture of low-carbon martensite and thin cementite plates is formed in the under-surface region of carbon eutectoid steel after heat treatment, with a controlled holding time at the austenitizing temperature. Full article
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