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Metals
Special Issues
Thermomechanical Processing, Microstructure Evolution and Mechanical Properties of Alloys
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Thermomechanical Processing, Microstructure Evolution and Mechanical Properties of Alloys

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 May 2022) | Viewed by 6068

Special Issue Editors

Dr. Dongbin Wei

E-Mail Website
Guest Editor
School of Mechanical and Mechatronic Engineering, University of Technology Sydney, Ultimo, NSW 2007, Australia
Interests: micro forming; numerical modeling of material processing; tribology in metal forming; advanced materials testing technology
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Liqing Chen

E-Mail Website
Guest Editor
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
Interests: metals and alloys; metal forming; microstructure and properties
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Zhengyi Jiang

E-Mail Website
Guest Editor
School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW 2522, Australia
Interests: numerical simulation of metal forming; tribology in metal forming; multi-scale materials processing; advanced rolling technology; microforming; manufacturing of composites; contact mechanics; friction and wear in manufacturing; lubrication technology; development of novel lubricants
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Thermomechanical processing (TMP) is a physical metallurgical process that combines the mechanical or plastic deformation process with thermal processes. It has been widely applied to optimize the microstructure of alloys through grain refining, phase transformation, etc., to improve their mechanical properties. This Special Issue will focus on the recent development of thermomechanical processing. It will cover alloy design, phase transformation, participate control, and prediction of microstructure evolution and mechanical properties of the alloys in TMP. Applications of artificial intelligence and big data analysis in TMP for optimizing TMP will be included in this issue.

Dr. Dongbin Wei
Prof. Dr. Liqing Chen
Prof. Dr. Zhengyi Jiang
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. 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

  • thermomechanical processing
  • alloy design
  • phase transformation
  • mechanical properties
  • artificial intelligence
  • big data
  • optimization

Published Papers (3 papers)

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Research

16 pages, 3514 KiB  
Article
Microstructure and Continuous Cooling Transformation of an Fe-7.1Al-0.7Mn-0.4C-0.3Nb Alloy
by Mônica Aline Magalhães Gurgel, Eustáquio de Souza Baêta Júnior, Rodolfo da Silva Teixeira, Gabriel Onofre do Nascimento, Suzane Sant’Ana Oliveira, Duílio Norberto Ferronatto Leite, Luciano Pessanha Moreira, Luiz Paulo Brandao and Andersan dos Santos Paula
Metals 2022, 12(8), 1305; https://doi.org/10.3390/met12081305 - 03 Aug 2022
Cited by 1 | Viewed by 1583
Abstract
Reducing pollutant emissions and improving safety standards are primary targets for modern mobility improvement. To meet these needs, the development of low-density steels containing aluminum is a new frontier of research for automotive applications. Low-density Fe-Mn-Al-C alloys are promising. In this regard, an [...] Read more.
Reducing pollutant emissions and improving safety standards are primary targets for modern mobility improvement. To meet these needs, the development of low-density steels containing aluminum is a new frontier of research for automotive applications. Low-density Fe-Mn-Al-C alloys are promising. In this regard, an alloy with high aluminum content and niobium addition belonging to the Fe-Mn-Al-C system was evaluated to understand the possible phase transformations and thus obtain a transformation diagram by continuous cooling to help future processing. Dilatometry tests were performed in a Gleeble thermomechanical simulator with different cooling rates (1, 3, 5, 10, 15, 20, 30, and 50 °C/s). Chemical analyses carried out simultaneously with dilatometry tests showed the presence of proeutectoid ferrite (αp), δ-ferrite, retained austenite, and niobium carbide (NbC). In the case of low cooling rates (1 and 3 °C/s), lamellar colonies of the eutectoid microconstituents were observed with a combination of α-ferrite and k-carbide. For higher cooling rates (5 to 50 °C/s), martensite was observed with body-centered cubic (BCC) and body-centered tetragonal (BCT) structures. Full article
(This article belongs to the Special Issue Thermomechanical Processing, Microstructure Evolution and Mechanical Properties of Alloys)
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10 pages, 4209 KiB  
Article
Effect of Austenite Grain Size on the Bainitic Transformation in a 690 MPa Grade High-Strength Multi-Functional Construction Steel
by Zhenye Chen, Xiujuan Zhao, Jianjun Qi, Wenting Zhu, Yanqing Zhao and Liqing Chen
Metals 2022, 12(4), 577; https://doi.org/10.3390/met12040577 - 29 Mar 2022
Viewed by 1851
Abstract
A high-strength low-carbon construction structural steel was investigated in the laboratory. The various austenite grain sizes were obtained by austenitizing the steel at different temperatures. The effect of austenite grain size on bainite transformation was studied by the dilatometer. The results show that [...] Read more.
A high-strength low-carbon construction structural steel was investigated in the laboratory. The various austenite grain sizes were obtained by austenitizing the steel at different temperatures. The effect of austenite grain size on bainite transformation was studied by the dilatometer. The results show that the microstructure of high-strength low-carbon structural steels mainly includes granular bainite, lath-like bainite and martensite-austenite (M-A). The microstructure changes from granular bainite to lath-like bainite with the increase in austenitizing temperature or austenite grain size. When the samples were heated at the lower temperature of 860 °C, the bainite starting temperature was relatively high, which was mainly attributed to the promotion of the granular bainitic nucleation and the formation of the solute-depleted regions in the austenite. Compared to 860 and 1260 °C, the bainite transformation rate in the specimen austenitized at 1000 °C is the highest because of the small prior austenite grain size and larger transformation driving force. Full article
(This article belongs to the Special Issue Thermomechanical Processing, Microstructure Evolution and Mechanical Properties of Alloys)
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17 pages, 8878 KiB  
Article
The Research on Recrystallization Behaviors and Mechanism of a Medium-Density Ni-Based Alloy
by Kai Feng, Xiaxu Huang, Rui Wang, Wenli Xue, Yilei Fu and Zhaoxin Li
Metals 2022, 12(1), 137; https://doi.org/10.3390/met12010137 - 11 Jan 2022
Viewed by 1864
Abstract
Revealing the recrystallization behavior and mechanism of this new alloy is of great significance to subsequent research. In this study, the Ni-36.6W-15Co ternary medium heavy alloy was solution-treated at 1100–1200 °C for different lengths of time. The grain size change, microstructure and texture [...] Read more.
Revealing the recrystallization behavior and mechanism of this new alloy is of great significance to subsequent research. In this study, the Ni-36.6W-15Co ternary medium heavy alloy was solution-treated at 1100–1200 °C for different lengths of time. The grain size change, microstructure and texture evolution as well as twin development during recrystallization annealing were analyzed using SEM, EBSD and TEM techniques. The study found that complete recrystallization occurs at 1150 °C/60 min. In addition, it takes a longer amount of time for complete recrystallization to occur at 1100 °C. The value of the activation energy Q1 of the studied alloys is 701 kJ/mol and the recrystallization process is relatively slow. By comparing the changes of microstructure and texture with superalloys, it is found that the recrystallization mechanism of the studied alloy is different from that of the superalloy. The development of annealing twins has a great influence on the recrystallization behavior and mechanism. The results show that the twin mechanism is considered as the dominant recrystallization mechanism of the studied alloy, although the formation and development of sub-grains appear in the early stage of recrystallization. Full article
(This article belongs to the Special Issue Thermomechanical Processing, Microstructure Evolution and Mechanical Properties of Alloys)
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