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Metals
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Thermomechanical Treatment of Metals and Alloys—Second Edition
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Thermomechanical Treatment of Metals and Alloys—Second Edition

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: 30 April 2024 | Viewed by 1936

Special Issue Editor

Dr. Igor Yu. Litovchenko

E-Mail Website
Guest Editor
Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, 634055 Tomsk, Russia
Interests: steels; in-core nuclear power engineering materials; plastic deformation; thermomechanical treatment; phase transformations, deformation-induced martensite; austenite reversion; precipitation, electron microscopy; deformation microstructures; grain refinement; mechanical properties
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Thermomechanical treatments are among the most effective methods for modifying the grain structure, structural phase states, and defect substructure determining the mechanical properties of metals and alloys. The development of new alloys and the use of new processing types open up prospects for achieving a unique combination of strength, plasticity, and functional properties in metallic materials. Despite the numerous studies along this line, the role of thermomechanical treatments in ensuring the required level of mechanical properties, the issues of the strengthening mechanisms, and the possibility of increasing strength via new grain-boundary and structural-phase designs are still relevant.

This Special Issue addresses the effect of various thermomechanical treatments on the structural phase states, deformed microstructure, and mechanical properties of a wide range of metallic materials, including pure metals, steels, and alloys. Articles considering the role of strengthening mechanisms (solid solution, grain boundary, substructural, dispersion, etc.) in ensuring the mechanical properties of metals and alloys under any thermomechanical treatments are highly welcome. The alloy properties in focus can be short-term strength and ductility at low and high temperatures, long-term and fatigue strength, creep and toughness, as well as functional properties. The submission of both theoretical and experimental papers is welcome.

We are looking forward to your contributions to this Special Issue.

Dr. Igor Yu. Litovchenko
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

  • steels
  • in-core nuclear power engineering materials
  • plastic deformation
  • thermomechanical treatment
  • phase transformations, deformation-induced martensite
  • austenite reversion
  • precipitation, electron microscopy
  • deformation microstructures
  • grain refinement
  • mechanical properties

Published Papers (2 papers)

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Research

14 pages, 7950 KiB  
Article
Mechanical Properties and Fracture Toughness Prediction of Ductile Cast Iron under Thermomechanical Treatment
by Mohammed Y. Abdellah, Hamzah Alharthi, Rami Alfattani, Dhia K. Suker, H. M. Abu El-Ainin, Ahmed F. Mohamed, Mohamed K. Hassan and Ahmed H. Backar
Metals 2024, 14(3), 352; https://doi.org/10.3390/met14030352 - 19 Mar 2024
Viewed by 768
Abstract
Temperature has a great influence on the mechanical properties of ductile cast iron or nodular cast iron. A thermomechanical treatment was carried out at various elevated temperatures of 450 °C, 750 °C and 850 °C using a universal testing machine with a tub [...] Read more.
Temperature has a great influence on the mechanical properties of ductile cast iron or nodular cast iron. A thermomechanical treatment was carried out at various elevated temperatures of 450 °C, 750 °C and 850 °C using a universal testing machine with a tub furnace. Specimens were held at these temperatures for 20 min to ensure a homogeneous temperature distribution along the entire length of the specimen, before a tensile load was applied. Specimens were deformed to various levels of uniform strain (0%, 25%, 50%, 75%, and 100%). These degrees of deformation were measured with a dial gauge attached to a movable cross plate. Three strain rates were used for each specimen and temperature: 1.8×10−4 s−1, 9×10−4 s−1 and 4.5×10−3 s−1. A simple analytical model was extracted based on the CT tensile test geometry and yield stress and a 0.2% offset strain to measure the fracture toughness (JIC). To validate the analytical model, an extended finite element method (XFEM) was implemented for specimens tested at different temperatures, with a strain rate of 1.8×10−4 s−1. The model was then extended to include the tested specimens at other strain rates. The results show that increasing strain rates and temperature, especially at 850 °C, increased the ductility of the cast iron and thus its formability. The largest percentage strains were 1 and 1.5 at a temperature of 750 °C and a strain rate of 1.8×10−4 s−1 and 9×10−4 s−1, respectively, and reached their maximum value of 1.7 and 2.2% at 850 °C and a strain rate of 9×10−4 s−1 and 4.5×10−3 s−1, respectively. In addition, the simple and fast analytical model is useful in selecting materials for determining the fracture toughness (JIC) at various elevated temperatures and different strain rates. Full article
(This article belongs to the Special Issue Thermomechanical Treatment of Metals and Alloys—Second Edition)
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19 pages, 5764 KiB  
Article
The Cold-Brittleness Regularities of Low-Activation Ferritic-Martensitic Steel EK-181
by Nadezhda Polekhina, Valeria Osipova, Igor Litovchenko, Kseniya Spiridonova, Sergey Akkuzin, Vyacheslav Chernov, Mariya Leontyeva-Smirnova, Nikolay Degtyarev, Kirill Moroz and Boris Kardashev
Metals 2023, 13(12), 2012; https://doi.org/10.3390/met13122012 - 14 Dec 2023
Viewed by 807
Abstract
The behavior of the EK-181 low-activation ferritic-martensitic reactor steel (Fe–12Cr–2W–V–Ta–B) in the states with different levels of strength and plastic properties after traditional heat treatment (THT) and after high-temperature thermomechanical treatment (HTMT) in the temperature range from −196 to 25 °C, including the [...] Read more.
The behavior of the EK-181 low-activation ferritic-martensitic reactor steel (Fe–12Cr–2W–V–Ta–B) in the states with different levels of strength and plastic properties after traditional heat treatment (THT) and after high-temperature thermomechanical treatment (HTMT) in the temperature range from −196 to 25 °C, including the range of its cold brittleness (ductile–brittle transition temperature, DBTT) is studied. The investigations are carried out using non-destructive acoustic methods (internal friction, elasticity) and transmission and scanning electron microscopy methods. It is found that the curves of temperature dependence of internal friction (the vibration decrement) of EK-181 steel after THT and HTMT are similar to those of its impact strength. Below the ductile–brittle transition temperature, it is characterized by a low level of dislocation internal friction. The temperature dependence curves of the steel elastic modulus increase monotonically with the decreasing temperature. In this case, the value of Young’s modulus is structure-sensitive. A modification of the microstructure of EK-181 steel as a result of HTMT causes its elastic modulus to increase, compared to that after THT, over the entire temperature range under study. The electron microscopic studies of the steel microstructure evolution near the fracture surface of the impact samples (in the region of dynamic crack propagation) in the temperature range from −196 to 100 °C reveal the traces of plastic deformation (increased dislocation density, fragmentation of the martensitic structure) at all of the temperatures under study, including those below the cold brittleness threshold of EK-181 steel. Full article
(This article belongs to the Special Issue Thermomechanical Treatment of Metals and Alloys—Second Edition)
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