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Crystals
Special Issues
Preparation and Characterization of Structural/High-Strength Steels
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Preparation and Characterization of Structural/High-Strength Steels

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: closed (11 January 2024) | Viewed by 2213

Special Issue Editors

Dr. Evgeniy Tkachev

E-Mail Website
Guest Editor
1. Laboratory of Mechanical Properties of Nanostructured Materials and Superalloys, Belgorod State University, Belgorod 308015, Russia
2. Moscow Timiryazev Agricultural Academy, Russian State Agrarian University, Moscow 127550, Russia
Interests: heat-resistant steels; creep; alloying; mechanical properties; microstructure investigations; scanning and transmission electron microscopy
Dr. Andrey Belyakov

E-Mail Website1 Website2
Guest Editor
Laboratory of Mechanical Properties of Nanostructured Materials and Superalloys, Belgorod National Research University, Pobeda 85, Belgorod 308015, Russia
Interests: structural steels and alloys; microstructure; grain boundaries; dislocation substructure; deformation and annealing behavior; strength and plasticity
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The advanced structural/high-strength steels with low-to-medium carbon content and additions of Cr, Ni, Mn, Mo, W, V, Nb, N and other elements are the main structural material used in different industrial fields due to their good mechanical properties, machinability, and low cost. These steels are characterized by the complex microstructures with high densities of internal interfaces, carbides/carbonitrides, and free dislocations. The improved strength of these steels is based on a combination of the different strengthening mechanisms, i.e., solution hardening and precipitation hardening grain boundary strengthening, and depends significantly on the microstructural characteristics. The microstructural evolution and methods to improve the strength–ductility balance of these steels are of great interest, and many studies have been performed in this area during the last decade. However, further investigations are required to clarify the microstructure–mechanical properties relationship and to determine a more reliable alloying design.

The aim of this Special Issue is to clarify the basic principles of alloying design, processing and applications, as well as new progress and findings, in the field of structural/high-strength steels. The articles presented in this Special Issue will cover various topics, including but not limited to:

Alloying design;

Microstructure characterization;

Mechanical behaviour at elevated temperatures;

Heat treatment and thermo-mechanical processing;

Microstructural degradation and fracture behaviour;

Precipitation and coarsening of secondary particles;

Corrosion, physical and mechanical behaviours;

Welding of the similar and dissimilar materials;

Microstructure–mechanical properties relationship.

Dr. Evgeniy Tkachev
Dr. Andrey Belyakov
Guest Editors

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. Crystals 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

  • structural/high-strength steels
  • mechanical properties
  • heat treatment
  • martensite
  • austenite
  • microstructure characterization
  • secondary particles

Published Papers (2 papers)

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Research

7 pages, 3570 KiB  
Communication
Investigation of the Evolution of Schmid Factors (SF) in 316 Stainless Steel during In Situ Plastic Deformation
by Xiaofeng Wan, Jin Wang, Penghou Li, Jianguo Chen and Xiao Wang
Crystals 2023, 13(10), 1510; https://doi.org/10.3390/cryst13101510 - 18 Oct 2023
Viewed by 939
Abstract
The Schmid factor (SF) is a critical parameter in crystal plasticity research that is often used to evaluate the level of difficulty in activating the slip systems within a grain. The evolution process and change mechanism of SF in 316 austenitic stainless steel [...] Read more.
The Schmid factor (SF) is a critical parameter in crystal plasticity research that is often used to evaluate the level of difficulty in activating the slip systems within a grain. The evolution process and change mechanism of SF in 316 austenitic stainless steel during plastic deformation were investigated in this paper by using the in situ electron backscatter diffraction (EBSD) technique. The results showed that the average Schmid factor of global grains was highest in the original state, but after stretching, multiple rotation paths appeared in the grain, and the SF presented a monotonically decreased tendency with the increase in plastic strain degree. Numerical computation revealed that the decrease of SF was mainly governed by the change in φ angle, i.e., the angle between loading direction and slip plane normal increased inside the grains after the lattice rotation, which caused the slip plane to move parallel to the loading direction. The higher φ, the lower its cosine, which corresponds to low shear stress acting on the slip plane and could increase the difficulty of crystal slip. Full article
(This article belongs to the Special Issue Preparation and Characterization of Structural/High-Strength Steels)
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15 pages, 9617 KiB  
Article
Improved Mechanical Properties of SUS304/AA5083 Dissimilar Joint by Laser Ablation Pretreatment in Vortex- Friction Stir Lap Welding
by Xiaochao Liu, Jingyue Luo, Wenhui Bao, Xianjun Pei, Qinghua Wang and Zhonghua Ni
Crystals 2023, 13(9), 1336; https://doi.org/10.3390/cryst13091336 - 31 Aug 2023
Cited by 1 | Viewed by 872
Abstract
To obtain a high-quality Al/steel dissimilar joint, a micro-groove-assisted vortex-friction stir lap welding (MG-VFSLW) process was developed. Through prefabricating micro-grooves on the steel plate surface by laser ablation, high-quality mechanical interlock and metallurgical bonding were obtained simultaneously in the MG-VFSLW process. The weld [...] Read more.
To obtain a high-quality Al/steel dissimilar joint, a micro-groove-assisted vortex-friction stir lap welding (MG-VFSLW) process was developed. Through prefabricating micro-grooves on the steel plate surface by laser ablation, high-quality mechanical interlock and metallurgical bonding were obtained simultaneously in the MG-VFSLW process. The weld formation, interface microstructure, mechanical properties, and failure mode in MG-VFSLW were studied by comparing them with those in VFSLW. The results showed that a line load of the AA5083/SUS304 dissimilar joint up to 485.9 N/mm was obtained by MG-VFSLW, which is 40.1% higher than that in VFSLW. Remarkable intermetallic compound layers and cracks were found in VFSLW. The cracks were closely related to the oxides on the interface. However, in MG-VFSLW, cross-riveting aluminum rivets and steel rivets were formed on the interface due to the micro-grooves and flashes made by the laser ablation. Good metallurgical bonding was also formed between AA5083 and SUS304. No remarkable intermetallic compound layers and cracks occurred. During the tensile shear tests, the aluminum rivets were cut off and some dimples and tear ridges existed on the fracture surface. In short, the high strength of the Al/steel lap joint in MG-VFSLW was attributed to the high-quality mechanical interlock and metallurgical bonding. Full article
(This article belongs to the Special Issue Preparation and Characterization of Structural/High-Strength Steels)
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