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Research on Microstructure Evolution and Properties of High-Strength Steel
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Research on Microstructure Evolution and Properties of High-Strength Steel

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: 20 May 2024 | Viewed by 1910

Special Issue Editors

Dr. Guosheng Sun

E-Mail Website
Guest Editor
Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China
Interests: ultrahigh-strength steels with good ductility; material processing/manufacturing; materials characterization; mechanical properties; strengthening and toughening; fracture mechanics
Dr. Zhenguang Liu

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, China
Interests: high-performance metal material forming and manufacturing; additive manufacturing; welding and service (friction, wear, corrosion) behavior research

Special Issue Information

Dear Colleagues,

High/ultrahigh-strength steels are advanced materials with exceptional strength and toughness. They are widely used in various industries, such as automotive, construction, and aerospace, due to their ability to withstand high stress and weight. Reasonable microstructure design and its evolution features are crucial for the achievement of excellent mechanical properties. Chemical composition, preparation technology (i.e., casting, additive manufacturing), and processing (i.e., TMCP, severe plastic deformation, heat treatment) are important factors that significantly affect the microstructure characteristics of materials. Thus, integrated research on the composition, processing, microstructure, and properties of materials will provide a better understanding of the correspondence between microstructures and mechanical properties, to promote the development and application of high/ultrahigh-strength steels. The aim of this Special Issue is to publish original research articles, communications and reviews dealing with processing techniques, microstructure evolution, fracture behavior, and the strengthening and toughening mechanisms of high-strength steels. Contributions encompassing experiments, simulations, and modelling related to the above subject are all encouraged.

Dr. Guosheng Sun
Dr. Zhenguang Liu
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. Materials is an international peer-reviewed open access semimonthly 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

  • high-strength steel
  • phase transformation
  • microstructure
  • mechanical property
  • plastic deformation
  • fracture behavior
  • strengthening and toughening mechanism

Published Papers (2 papers)

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Research

13 pages, 10050 KiB  
Article
Strengthening and Embrittling Mechanism of Super 304H Steel during Long-Term Aging at 650 °C
by Yue Wu, Fufangzhuo Chai, Junjian Liu, Jiaqing Wang, Yong Li and Chengchao Du
Materials 2024, 17(3), 740; https://doi.org/10.3390/ma17030740 - 03 Feb 2024
Viewed by 727
Abstract
Super 304H has been a crucial material for ultra-supercritical boilers. However, the relationship between microstructure evolution, strengthening mechanism, and embrittling behavior during long-term aging was lacking investigation. This investigation aimed to reveal the strengthening and embrittling mechanism from precipitates in Super 304H. The [...] Read more.
Super 304H has been a crucial material for ultra-supercritical boilers. However, the relationship between microstructure evolution, strengthening mechanism, and embrittling behavior during long-term aging was lacking investigation. This investigation aimed to reveal the strengthening and embrittling mechanism from precipitates in Super 304H. The results showed that the hardness increment came from the grain boundary’s M23C6 (GB’s M23C6) and intragranular nano Cu-rich particles. After being aged for 5000 h, the GB’s M23C6 and nano Cu-rich particles provided a hardness increment of approximately 10 HV and 30 HV, respectively. The impact toughness gradually decreased from 213 J/cm2 to 161 J/cm2 with the extending aging time. For the aged Super 304H, the GB’s M23C6 provided a higher cracking source. In addition, the nano Cu-rich particle restricted the twin-induced plastic deformation of austenitic grain and depressed the absorbed energy from austenitic grain deformation. Full article
(This article belongs to the Special Issue Research on Microstructure Evolution and Properties of High-Strength Steel)
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16 pages, 7754 KiB  
Article
Achieving 2.2 GPa Ultra-High Strength in Low-Alloy Steel Using a Direct Quenching and Partitioning Process
by Gang Niu, Donghao Jin, Yong Wang, Haoxiu Chen, Na Gong and Huibin Wu
Materials 2023, 16(24), 7533; https://doi.org/10.3390/ma16247533 - 06 Dec 2023
Viewed by 883
Abstract
Advanced high-strength steels (AHSS) have a wide range of applications in equipment safety and lightweight design, and enhancing the strength of AHSS to the ultra-high level of 2 GPa is currently a key focus. In this study, a new process of thermo-mechanical control [...] Read more.
Advanced high-strength steels (AHSS) have a wide range of applications in equipment safety and lightweight design, and enhancing the strength of AHSS to the ultra-high level of 2 GPa is currently a key focus. In this study, a new process of thermo-mechanical control process followed by direct quenching and partitioning (TMCP-DQP) was developed based on Fe-0.4C-1Mn-0.6Si (wt.%) low-alloy steel, and the effects of microstructure evolution on mechanical properties under TMCP-DQP process and conventional hot rolled quenched and tempered process (HR-QT) were comparatively studied. The results show that the TMCP-DQP process not only shortened the processing steps but also achieved outstanding comprehensive mechanical properties. The TMCP-DQP steel exhibited a tensile strength of 2.23 GPa, accompanied by 11.9% elongation and a Brinell hardness of 624 HBW, with an impact toughness of 28.5 J at −20 °C. In contrast, the HR-QT steel exhibited tensile strengths ranging from 2.16 GPa to 1.7 GPa and elongations between 5.2% and 12.2%. The microstructure of TMCP-DQP steel primarily consisted of lath martensite, containing thin-film retained austenite (RA), nanoscale rod-shaped carbides, and a minor number of nanoscale twins. The volume fraction of RA reached 7.7%, with an average carbon content of 7.1 at.% measured by three-dimensional atom probe tomography (3DAP). Compared with the HR-QT process, the TMCP-DQP process resulted in a finer microstructure, with a prior austenite grain (PAG) size of 11.91 μm, forming packets and blocks with widths of 5.12 μm and 1.63 μm. The TMCP-DQP process achieved the ultra-high strength of low-alloy steel through the synergistic effects of grain refinement, dislocation strengthening, and precipitation strengthening. The dynamic partitioning stage stabilized the RA through carbon enrichment, while the relaxation stage reduced a small portion of the dislocations generated by thermal deformation, and the self-tempering stage eliminated internal stresses, all guaranteeing considerable ductility and toughness. The TMCP-DQP process may offer a means for industries to streamline their manufacturing processes and provide a technological reference for producing 2.2 GPa grade AHSS. Full article
(This article belongs to the Special Issue Research on Microstructure Evolution and Properties of High-Strength Steel)
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