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Special Issue "Microstructure and Mechanical Properties of Alloys"

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

Deadline for manuscript submissions: 20 June 2023 | Viewed by 1308

Special Issue Editor

State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
Interests: welding and joining; microstructure characterization; titanium alloys; nanomaterials; properties; interface engineering; coating
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

It is my pleasure to invite you to submit a manuscript to the Special Issue “Microstructure and Mechanical Properties of Alloys” in Materials (Impact Factor: 3.748).

Metal alloys are widely used in industrial products, and their microstructure and mechanical properties directly affect the performance of products. During the whole life cycle of a metal product, its microstructure and mechanical properties will undergo multiple stages of evolution. Firstly, the preparation of alloys, including metallurgy, casting and rolling, determines the initial properties of alloys. Afterward, alloys will undergo welding, joining or machining processes in order to manufacture metal products, which will also affect the microstructure and mechanical properties of alloys. Finally, during the service process of metal products, they will experience high-temperature, -oxidation or -corrosion environments, which will affect the microstructure and mechanical properties of alloys to varying degrees. It is crucial to study the micro store and properties of alloys in the whole life cycle to promote the development and application of alloys.

The aim of this Special Issue is to provide an updated outlook on the microstructure and mechanical properties of alloys at various stages, including the preparation, processing and service stages. Especially the correspondence between alloys microstructure and mechanical properties needs to be established. These papers can help resolve and understand the evolution of properties of alloys products at different stages. This will help to adjust and design the microstructure and mechanical properties of alloys throughout the whole life cycle.

This Special Issue represents a good opportunity for researchers around the world to disseminate different aspects of their work and report the results related to this topic.

Research articles, review articles, and communications are invited for submission to this Special Issue.

Dr. Xiaoqing Si
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. 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 2300 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

  • microstructure characterization
  • mechanical properties
  • metals and alloys
  • welding and joining
  • improvement of properties
  • machining methods
  • joint strength
  • microstructure evolution
  • corrosion resistance

Published Papers (2 papers)

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Research

Article
Effect of Intercritical Temperature on the Microstructure and Mechanical Properties of a Ferritic–Martensitic Dual-Phase Low-Alloy Steel with Varying Nickel Content
Materials 2022, 15(24), 9018; https://doi.org/10.3390/ma15249018 - 16 Dec 2022
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Abstract
Dual-phase low-alloy steels combine a soft ferrite phase with a hard martensite phase to create desirable properties in terms of strength and ductility. Nickel additions to dual-phase low-alloy steels can increase the yield strength further and lower the transformation temperatures, allowing for microstructure [...] Read more.
Dual-phase low-alloy steels combine a soft ferrite phase with a hard martensite phase to create desirable properties in terms of strength and ductility. Nickel additions to dual-phase low-alloy steels can increase the yield strength further and lower the transformation temperatures, allowing for microstructure refining. Determining the correct intercritical annealing temperature as a function of nickel content is paramount, as it defines the microstructure ratio between ferrite and martensite. Likewise, quantifying the influence of nickel on the intercritical temperature and its synergistic effect with the microstructure ratio on mechanical properties is vital to designing dual-phase steels suitable for corrosive oil and gas services as well as hydrogen transport and storage applications. In this work, we used a microstructural design to develop intercritical annealing heat treatments to obtain dual-phase ferritic–martensitic low-alloy steels. The intercritical annealing and tempering temperatures and times were targeted to achieve three different martensite volume fractions as a function of nickel content, with a nominal content varying between 0, 1, and 3-wt% Ni. Mechanical properties were characterized using tensile testing and microhardness measurements. Additionally, the microstructure was studied using scanning electron microscopy coupled with electron backscatter diffraction analysis. Tensile strength increased with increasing martensite ratio and nickel content, with a further grain refinement effect found in the 3-wt% Ni steel. The optimal heat treatment parameters for oil and gas and hydrogen transport applications are discussed. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Alloys)
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Article
Carbides Dissolution in 5Cr15MoV Martensitic Stainless Steel and New Insights into Its Effect on Microstructure and Hardness
Materials 2022, 15(24), 8742; https://doi.org/10.3390/ma15248742 - 07 Dec 2022
Cited by 1 | Viewed by 377
Abstract
The dissolution behavior of carbides in martensitic stainless steel and its effect on microstructure and hardness were investigated by using X-ray diffractometer (XRD) and field emission scanning electron microscopy (FE-SEM) with energy dispersive spectrometer (EDS) and electron backscattering diffraction (EBSD). The results indicated [...] Read more.
The dissolution behavior of carbides in martensitic stainless steel and its effect on microstructure and hardness were investigated by using X-ray diffractometer (XRD) and field emission scanning electron microscopy (FE-SEM) with energy dispersive spectrometer (EDS) and electron backscattering diffraction (EBSD). The results indicated that the microstructure after austenitizing heat treatment and oil quenched consisted of martensite, M23C6 carbides and retained austenite. The temperature and particle size had great influence on the dissolution of carbides. The EBSD results showed that the twin-related variant pair V1/V2 governed the phase transformation. Meanwhile, the density of high-angle grain boundaries (HAGBs) increased with the increase of austenitizing temperature from 950 to 1150 °C. The hardness test results indicated that the hardness first increased and then decreased with the increase of the austenitizing temperature, and the peak appeared at 1050 °C with a Rockwell hardness value of 59.8 HRC. A model was established to quantitatively explain the contribution of different microstructures to hardness. The contribution to hardness came mainly from martensite. The retained austenite had a negative effect on hardness when the volume fraction was more than 10%. In contrast, carbides contributed less to hardness due to their small content. Full article
(This article belongs to the Special Issue Microstructure and Mechanical Properties of Alloys)
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