Microstructural Characteristics and Mechanical Behavior of Austenitic Stainless Steel

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Casting, Forming and Heat Treatment".

Deadline for manuscript submissions: closed (31 August 2023) | Viewed by 1228

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Guest Editor
School of Metallurgy & Materials Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran
Interests: high-performance engineering materials; mechanical/physical properties of additively manufactured materials; thermomechanical processing of ferrous and non-ferrous alloys

Special Issue Information

Dear Colleagues,

The room- and high-temperature mechanical properties of austenitic stainless steels are dependent on their specific microstructure characteristics in micro, nano and atomic scales. In this respect, the alloying elements and alloying strategy, casting condition, subsequent thermo(mechanical) processing routes and post-heat treatments certainly influence the microstructural features. Therefore, describing the microstructure–processing–properties relationship in austenitic stainless steels is of high interest and critical for efficient and economical design to meet application requirements.

This Special Issue will focus on the microstructure of austenitic stainless steels, with an emphasis on its correlation with strain-hardening behavior and involved deformation mechanisms. This Special Issue encourages a discussion of the effect of grain structure, substructure, dislocation networks, annealing and deformation twins, austenite stability, slip character, stacking fault energy and texture on the hardening behavior of austenitic stainless steels. Studies that focus on innovative and more cost-effective compositions, metastable stainless steels, and those subjected to different processing routes from conventional to new forms, such as additive manufacturing and thermomechanical treatments, are also invited. We hope that this issue contributes to expanding our knowledge regarding the strength–ductility balance of austenitic stainless steels, as well as suggesting ideas for future composition designs. Manuscripts are highly welcomed from both academic and commercial viewpoints that present innovative and original findings.

Dr. Hamid Reza Abedi
Guest Editor

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Keywords

  • austenitic stainless steel
  • twinning
  • grain refinement
  • stacking fault energy
  • strain hardening
  • mechanical properties
  • deformation mechanisms
  • austenite stability
  • texture
  • microstructure

Published Papers (1 paper)

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Research

12 pages, 4291 KiB  
Article
Modification of Microstructure and Mechanical Parameters of Austenitic Steel AISI 316L under the Action of Low Friction
by Daria Grabco, Olga Shikimaka, Constantin Pyrtsac, Daria Topal, Dragisa Vilotic, Marko Vilotic and Sergei Alexandrov
Metals 2023, 13(7), 1278; https://doi.org/10.3390/met13071278 - 16 Jul 2023
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Abstract
This work is devoted to the study of the tribological properties of AISI 316L austenitic steel and the effect of the relative velocity of rubbing bodies on the microstructure and mechanical properties. The specificity of the deformation is investigated in the mode of [...] Read more.
This work is devoted to the study of the tribological properties of AISI 316L austenitic steel and the effect of the relative velocity of rubbing bodies on the microstructure and mechanical properties. The specificity of the deformation is investigated in the mode of dry friction “metal/metal”, namely, steel AISI 316L/steel St3sp, with a process duration of 15 h. The change in the microstructure of the samples as a result of friction and the determination of mechanical properties are carried out on the friction surface and on the cross-section of the samples. The mechanical parameters are studied by depth-sensitive indentation using a Berkovich indenter. It is shown that low friction with the relative velocity of rubbing bodies of about 30 rpm is capable of introducing noticeable microstructural and strength changes. Strength and relaxation properties (hardness, Young’s modulus, plasticity index, and resistance index) increase in samples subjected to friction compared to the original undeformed sample. A change in the microscopic structure of the samples near the friction surface increases such material properties as microhardness (H) and Young’s modulus (E). In particular, the microhardness increases from 1.72 GPa for the undeformed sample to 3.5 GPa for the sample subjected to friction for 15 h. Young’s modulus increases from 107 GPa to 140 GPa, respectively. A comparison with the properties of samples deformed at the relative velocity of rubbing bodies of about 300 rpm shows a further increase in the microhardness and Young’s modulus. Also noted is the sensitivity of the relaxation parameters to the friction process and the relative velocity of rubbing bodies. In particular, the relaxation parameters hc and hres decrease while he-p increases. Full article
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