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Metals
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Study on Phase Transformation and Deformation of Metallic Materials
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Study on Phase Transformation and Deformation of Metallic Materials

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: 20 July 2024 | Viewed by 4243

Special Issue Editor

Dr. Baoqi Guo

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, Kyoto University, Yoshida-Honmachi, Kyoto 606-8501, Japan
Interests: Ti alloys; steels; phase transformation; recrystallization

Special Issue Information

Dear Colleagues,

Phase transformation is a very common phenomenon in metallic materials. It was activated in several circumstances, such as temperature variations or deformation. For instance, the well-known TRIP (transformation-induced plasticity) effect involves phase transformation during deformation and simultanesouly enhances plasticity. During high-temperature deformation of steels, the austenite phase transforms into the ferrite phase, a phenomenon known as dynamic transformation and used to produce ultrafine grained ferrite steels. 

The current Special Issue welcome articles that focus on phase transformation during thermomechanical processing of metallic materials (e.g., annealing or deformation). It will provide a comprehensive understanding of the fundamentals of phase transformation during thermomechanical processing.

Dr. Baoqi Guo
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

  • metallic materials
  • phase transformation
  • deformation
  • characterization
  • thermodynamics
  • kinetics
  • modeling

Published Papers (3 papers)

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Research

31 pages, 14558 KiB  
Article
The Effect of Operational Factors on Phase Formation Patterns in the Light-Water Reactor Pressure Vessel Steels
by Svetlana Fedotova and Evgenia Kuleshova
Metals 2023, 13(9), 1586; https://doi.org/10.3390/met13091586 - 12 Sep 2023
Viewed by 870
Abstract
This paper presents the results of atom probe tomography studies on radiation-induced phase formation in light-water reactor pressure vessel steels after neutron irradiation under various conditions in comparison with the literature data. The given irradiation conditions are fluence (10–100) × 1022 m [...] Read more.
This paper presents the results of atom probe tomography studies on radiation-induced phase formation in light-water reactor pressure vessel steels after neutron irradiation under various conditions in comparison with the literature data. The given irradiation conditions are fluence (10–100) × 1022 m−2, flux (5–2700) × 1014 m−2s−1 and irradiation temperature (50–400) °C. The composition of the studied steels varies in a wide range for the elements significantly affecting radiation and thermal resistance of steels: Ni in the range of 0.2–6.0 wt.%, Mn–0.03–1.1 wt.%, Cu–0.01–0.16 wt.%, and P–0.01–0.03 wt.%. The number density, volume fraction, size, composition, and nucleation sites of precipitates are determined. The regularities of the effect of various operational factors on the phase formation in these steels have been analyzed and revealed. The study shows that in materials with high copper content, Cu-rich precipitates are formed by a radiation-enhanced mechanism. In materials with low copper content, their formation upon irradiation at 300 °C occurs by a radiation-induced mechanism since the main nucleation sites are point defect clusters formed in cascades. At the same time, the density, volume fraction, and composition of the precipitates depend on the steel composition (Ni and Mn content). In the steel with increased Ni content up to 5 wt.% but with ultra-low Mn content ≤ 0.03 wt.%, it is possible to suppress the formation of Ni-Si-Mn precipitates under irradiation. Full article
(This article belongs to the Special Issue Study on Phase Transformation and Deformation of Metallic Materials)
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12 pages, 43920 KiB  
Article
Phase Transformation Behaviors and Dislocation Evolutions of an Additively Manufactured Ti-6Al-4V Alloy under Annealing Treatment
by Xiankun Ji, Haiming Xie, Jinlong Su, Fulin Jiang, Jie Teng, Hui Zhang and Baoqi Guo
Metals 2023, 13(6), 1061; https://doi.org/10.3390/met13061061 - 01 Jun 2023
Cited by 1 | Viewed by 1264
Abstract
Post annealing treatment is generally needed for additively manufactured titanium alloy to decompose metastable phases, alleviate residual stress, and improve ductility. In this work, in-situ electrical resistivity and line profile analysis of X-ray diffraction were utilized for monitoring phase transformation behaviors and dislocation [...] Read more.
Post annealing treatment is generally needed for additively manufactured titanium alloy to decompose metastable phases, alleviate residual stress, and improve ductility. In this work, in-situ electrical resistivity and line profile analysis of X-ray diffraction were utilized for monitoring phase transformation behaviors and dislocation evolutions of a laser powder bed fusion-built Ti-6Al-4V alloy under post annealing treatment. Besides, hardness and tensile tests were adopted for revealing the effects of phase transformation and dislocation evolutions on the mechanical properties. The results indicated that post annealing treatment decomposed martensitic α′ into lamellar α + β and eliminated dislocations efficiently. The martensite decomposition rate increased with the annealing temperature. Annealing at 700 °C for 4 h eliminated 98% of the dislocations, and further annealing has only a limited influence on the dislocation density. Annealing at 700 °C for 16 h is beneficial for achieving a high ductility of 10.3% owing to the favorable equilibrium lamellar α + β microstructure. These findings provide valuable insights for optimizing post annealing treatment procedures to enhance the mechanical properties of additively manufactured Ti-6Al-4V alloys. Full article
(This article belongs to the Special Issue Study on Phase Transformation and Deformation of Metallic Materials)
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15 pages, 3417 KiB  
Article
Microscale Strain Localizations and Strain-Induced Martensitic Phase Transformation in Austenitic Steel 301LN at Different Strain Rates
by Lalit Pun, Guilherme Corrêa Soares, Suprit Bhusare, Matti Isakov and Mikko Hokka
Metals 2023, 13(2), 207; https://doi.org/10.3390/met13020207 - 20 Jan 2023
Cited by 2 | Viewed by 1646
Abstract
Microscopic strain and strain-induced phase transformation during plastic deformation in metastable austenitic steel were investigated at different strain rates. Quasi in-situ tension tests were performed sequentially with well-defined elongation intervals at room temperature at strain rates of 10−3 s−1 and 10 [...] Read more.
Microscopic strain and strain-induced phase transformation during plastic deformation in metastable austenitic steel were investigated at different strain rates. Quasi in-situ tension tests were performed sequentially with well-defined elongation intervals at room temperature at strain rates of 10−3 s−1 and 10−1 s−1. The tests were monitored by high-resolution optical imaging with a microscopic lens at a resolution of 0.23 µm/pixel. The macroscopic temperature was also measured with an infrared (IR) camera. The microstructure-level strain localizations were observed on the surface of the etched specimens by means of microscale digital image correlation (µDIC). Additionally, the microstructure was characterized by electron backscatter diffraction (EBSD) at the same location before and after deformation. The results of the study indicated that microscopic strain localizations favored the formation of α′-martensite particles. At the lower strain rate, high local strain concentrations formed at several locations in the microstructure, correlating with the areas where the formation of large martensite islands occurred. Martensite particles of various sizes formed nearby each other at the lower strain rate, whereas at the higher strain rate, martensite islands remained small and isolated. Although the macroscopic increase in temperature at both the studied strain rates was very low, at the higher strain rate, local heating on the microscopic scale could take place at the newly nucleated martensite embryos. This inhibited the further growth of the martensite particles, and local strain distribution also remained more homogeneous than at the lower strain rate. Full article
(This article belongs to the Special Issue Study on Phase Transformation and Deformation of Metallic Materials)
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