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Microstructure, Mechanical Properties and Wear Performance of High-Strength Steels
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Microstructure, Mechanical Properties and Wear Performance of High-Strength Steels

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

Deadline for manuscript submissions: 20 October 2024 | Viewed by 3982

Special Issue Editors

Prof. Dr. Guang Xu

E-Mail Website
Guest Editor
State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Interests: high-strength steels; microstructure and properties; wear performance; heat treatment; processing
Dr. Man Liu

E-Mail Website
Guest Editor
State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
Interests: microstructure and property; phase transformation; strengthening mechanism; bainite steel; quenching-partitioning steel

Special Issue Information

Dear Colleagues,

As concerns over low carbon emissions and fuel saving have become more prominent, the development of high/ultra-high strength steels is of great significance. The third generation of advanced high-strength steels, such as nano-structure bainite steel, Q&P steel and medium manganese steel, have been designed to provide an improved combination of strength and ductility and some are increasingly applied in industrial production. Investigations into the microstructure, mechanical properties and wear performance of high-strength steels have been widely conducted. However, advanced high-strength steels still face some challenges. For example, the improvement of mechanical properties normally requires the addition of expensive alloying elements. Going forward, research on the microstructure, mechanical properties and wear performance of high-strength steels should be intensified in order to maximize strength and ductility as well as wear performance and promote industrial production.

Research articles, communications and reviews are all welcome. Topics in this Special Issue may include, but are not limited to:

  • optimization of chemical composition;
  • new processing technology;
  • novel heat treatments;
  • microstructural characterization;
  • strengthening mechanisms;
  • wear mechanisms;
  • industrial application.

Prof. Dr. Guang Xu
Dr. Man 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

  • mechanical property
  • wear performance
  • microstructure
  • heat treatments
  • numerical simulation
  • application

Published Papers (4 papers)

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Research

18 pages, 11760 KiB  
Article
Sintered Brake Pads Failure in High-Energy Dissipation Braking Tests: A Post-Mortem Mechanical and Microstructural Analysis
by Alexandre Mege-Revil, Jessie Rapontchombo-Omanda, Itziar Serrano-Munoz, Anne-Lise Cristol, Vincent Magnier and Philippe Dufrenoy
Materials 2023, 16(21), 7006; https://doi.org/10.3390/ma16217006 - 01 Nov 2023
Cited by 2 | Viewed by 899
Abstract
The industrial sintering process used to produce metallic matrix pads has been altered to diminish the amount of copper used. Unfortunately, replacing a large part of the copper with iron seems to have reached a limit. In the high-energy, emergency-type rail braking used [...] Read more.
The industrial sintering process used to produce metallic matrix pads has been altered to diminish the amount of copper used. Unfortunately, replacing a large part of the copper with iron seems to have reached a limit. In the high-energy, emergency-type rail braking used in this study, the materials are put to the very limit of their usage capacity, allowing us to observe the evolution of the microstructure and mechanical properties of sintered, metallic matrix pads. After the braking test, their compressive behaviour was assessed using digital image correlation (DIC), and their microstructure with scanning electron microscopy (SEM). The worn material has three flat layers with different microstructures and compressive behaviours. The bottom layer seems unmodified. Macroscopic and microscopic cracks run through the intermediate layer (2–15 mm depth). The top layer has stiffened thanks to resolidification of copper. The temperature reaches 1000 °C during the braking test, which also explains the carbon diffusion into iron that result in the weakening of iron –graphite interfaces in the pad. Finally, submicronic particles are detected at many open interfaces of the worn and compressed pad. Associated with the predominant role of graphite particles, this explains the weak compressive behaviour of the pads. Full article
(This article belongs to the Special Issue Microstructure, Mechanical Properties and Wear Performance of High-Strength Steels)
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12 pages, 8087 KiB  
Article
The Evolution of a Microstructure during Tempering and Its Influence on the Mechanical Properties of AerMet 100 Steel
by Hongli Wang, Jian Zhang, Jingtao Huang, Chengchuan Wu, Xianguang Zhang, Zhonghong Lai, Yong Liu and Jingchuan Zhu
Materials 2023, 16(21), 6907; https://doi.org/10.3390/ma16216907 - 27 Oct 2023
Viewed by 707
Abstract
In order to provide guidance for furthering the balance of strength and toughness of AerMet 100 steel through tempering treatment, the effects of the tempering time on microstructure and mechanical properties are investigated. The microstructure evolution, especially M2C precipitates and austenite [...] Read more.
In order to provide guidance for furthering the balance of strength and toughness of AerMet 100 steel through tempering treatment, the effects of the tempering time on microstructure and mechanical properties are investigated. The microstructure evolution, especially M2C precipitates and austenite in AerMet 100 tempered at 482 °C for 1~20 h, was characterized, and its influences on the mechanical properties were studied. The tensile strength decreases gradually, the yield strength increases first and then decreases, and the fracture toughness KIC increases gradually with an increasing tempering time. The strength and toughness matching of AerMet 100 steel is achieved by tempering at 482 °C for 5~7 h. Without considering the martensitic size effect, the influence of the dislocation density on the tensile strength is more significant during tempering at 482 °C. The precipitation strengthening mechanism plays a dominant role in the yield strength when tempering for 5 h or less, and the combined influence of carbide coarsening and a sharp decrease in the dislocation density resulted in a significant decrease in tensile strength when tempering for 8 h or more. The fracture toughness KIC is primarily influenced by the reverted austenite, so that KIC increases gradually with the prolongation of the tempering time. However, a significant decrease in the dislocation density resulting from long-term tempering has a certain impact on KIC, giving rise to a decrease in the rising amplitude in KIC after tempering for 8 h or more. Full article
(This article belongs to the Special Issue Microstructure, Mechanical Properties and Wear Performance of High-Strength Steels)
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14 pages, 12672 KiB  
Article
Development and Production of Artificial Test Swarf to Examine Wear Behavior of Running Engine Components—Part 2: Experimentally Derived Designs
by Patrick Brag, Volker Piotter, Klaus Plewa, Alexander Klein, Mirko Herzfeldt and Sascha Umbach
Materials 2023, 16(18), 6276; https://doi.org/10.3390/ma16186276 - 19 Sep 2023
Viewed by 697
Abstract
In subtractive manufacturing processes, swarf, burrs or other residues are produced, which can impair the function of a tribological system (e.g., journal bearings). To prevent premature engine damage, cleanliness requirements are defined for production processes. Damaging particle tests are an experimental approach for [...] Read more.
In subtractive manufacturing processes, swarf, burrs or other residues are produced, which can impair the function of a tribological system (e.g., journal bearings). To prevent premature engine damage, cleanliness requirements are defined for production processes. Damaging particle tests are an experimental approach for validating these defined cleanliness requirements. This methodical approach is not yet widely used. For one, the test setup must be developed and proven for the respective application. For another, in order to carry out the tests in a systematic manner, defined test particles with properties similar to those of the contaminants encountered in reality are required. In the second part of the paper, the process chain for manufacturing artificial test swarf by micro powder injection molding (MicroPIM) is described. The size and shape of the swarf were derived from real swarf via several abstraction processes. Although certain design guidelines for MicroPIM parts could not be taken into account, the targeted manufacturing tolerances were achieved in most cases. During demolding, it became apparent that the higher ejection forces of the free-formed geometries must be taken more into account in the design of the mold. The experiments on the test setup also revealed that the artificial test swarf was unexpectedly brittle and was therefore ground up in the bearing gap without causing any substantial damage to the bearing. Thus, the artificial test swarf in its current sintered state is not a suitable substitute for micromilled swarf. However, MicroPIM could still be used to manufacture test particles in applications involving lower mechanical forces. Full article
(This article belongs to the Special Issue Microstructure, Mechanical Properties and Wear Performance of High-Strength Steels)
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14 pages, 22598 KiB  
Article
Microstructure Evolution and Mechanical Response of a Direct Quenched and Partitioned Steel at Different Finishing Rolling Temperatures
by Yajun Liu, Xiaolong Gan, Wen Liang, Guang Xu, Jianghua Qi and Man Liu
Materials 2023, 16(9), 3575; https://doi.org/10.3390/ma16093575 - 06 May 2023
Cited by 1 | Viewed by 1259
Abstract
The effects of finishing rolling temperature on the microstructure and mechanical properties of a direct quenched and partitioned (DQ&P) steel were investigated by a thermal simulation machine, a field emission scanning electron microscope (FE-SEM), electron backscattering diffraction (EBSD), and a transmission electron microscope [...] Read more.
The effects of finishing rolling temperature on the microstructure and mechanical properties of a direct quenched and partitioned (DQ&P) steel were investigated by a thermal simulation machine, a field emission scanning electron microscope (FE-SEM), electron backscattering diffraction (EBSD), and a transmission electron microscope (TEM). The results show that the original austenite grain size was refined by 31% as the finishing rolling temperature decreased from 920 °C to 840 °C, leading to the formation of the finest martensite lath at 840 °C. At the same time, the lower finishing rolling temperature resulted in a higher dislocation density, and consequently improved the stability of the retained austenite. Moreover, compared to the conventional Q&P process, the comprehensive mechanical properties of a steel with similar chemical composition can be enhanced by DQ&P processing. With the decrease of finishing rolling temperature from 920 °C to 840 °C, the strength and total elongation increases. The yield strength, tensile strength, and total elongation reach the maximum values of 1121 MPa, 1134 MPa, and 11.7%, respectively, at 840 °C. Full article
(This article belongs to the Special Issue Microstructure, Mechanical Properties and Wear Performance of High-Strength Steels)
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