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High-Performance Alloys and Steels
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High-Performance Alloys and Steels

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

Deadline for manuscript submissions: 20 December 2024 | Viewed by 1470

Special Issue Editors

Prof. Dr. Haitao Liu

E-Mail Website
Guest Editor
State Key Laboratory of Rolling and Automation, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Interests: electrical steels; stainless steels; advanced high-strength steels; strip casting; hot/cold rolling; thermomechanical processing; texture; strengthening and toughening; magnetic properties
Prof. Dr. Huihu Lu

E-Mail Website
Guest Editor
School of Mechanical Engineering, North University of China, Taiyuan 030051, China
Interests: magnesium alloy; steel; mechanical property; microstructure evolution

Special Issue Information

Dear Colleagues,

Advanced steels and special alloys, such as Al alloys, Mg alloys, Ti-based alloys, Cu alloys, and high-entropy alloys, are important cornerstones for the development of modern industries, agriculture, livelihoods, the military, and other fields. At present, many fields, such as the automotive, aerospace, shipbuilding, petroleum, chemical engineering, electric power, and electronics industries, have put forward requirements for the weight reduction, cost reduction, extended service life, and improved service performance of both steel and alloy components. To achieve these goals, it is necessary, on the one hand, to develop high-performance steels with excellent properties, such as higher strength, higher plasticity, better toughness, lower density, more favorable corrosion resistance, etc. On the other hand, we need to develop high-performance alloys with better mechanical properties and outstanding physical and chemical properties, such as higher electric conductivity, higher thermal conductivity, better hydrogen storage and corrosion resistance, etc. The chemical composition design, microstructure evolution, and manufacturing processes collectively determine the mechanical, physical, and chemical properties of the above-mentioned materials. This Special Issue covers these topics and focuses on the composition process–structure–performance relationships of high-performance alloys and steels. Appropriate submissions to this Special Issue include regular research articles, short communications, and reviews.

Prof. Dr. Haitao Liu
Prof. Dr. Huihu Lu
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

  • alloys
  • steels
  • material processing
  • mechanical properties
  • physical and chemical properties

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Published Papers (2 papers)

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Research

26 pages, 7129 KiB  
Article
Multiscale Modeling of Nanoparticle Precipitation in Oxide Dispersion-Strengthened Steels Produced by Laser Powder Bed Fusion
by Zhengming Wang, Seongun Yang, Stephanie B. Lawson, Cheng-Hsiao Tsai, V. Vinay K. Doddapaneni, Marc Albert, Benjamin Sutton, Chih-Hung Chang, Somayeh Pasebani and Donghua Xu
Materials 2024, 17(22), 5661; https://doi.org/10.3390/ma17225661 - 20 Nov 2024
Viewed by 367
Abstract
Laser Powder Bed Fusion (LPBF) enables the efficient production of near-net-shape oxide dispersion-strengthened (ODS) alloys, which possess superior mechanical properties due to oxide nanoparticles (e.g., yttrium oxide, Y-O, and yttrium-titanium oxide, Y-Ti-O) embedded in the alloy matrix. To better understand the precipitation mechanisms [...] Read more.
Laser Powder Bed Fusion (LPBF) enables the efficient production of near-net-shape oxide dispersion-strengthened (ODS) alloys, which possess superior mechanical properties due to oxide nanoparticles (e.g., yttrium oxide, Y-O, and yttrium-titanium oxide, Y-Ti-O) embedded in the alloy matrix. To better understand the precipitation mechanisms of the oxide nanoparticles and predict their size distribution under LPBF conditions, we developed an innovative physics-based multiscale modeling strategy that incorporates multiple computational approaches. These include a finite volume method model (Flow3D) to analyze the temperature field and cooling rate of the melt pool during the LPBF process, a density functional theory model to calculate the binding energy of Y-O particles and the temperature-dependent diffusivities of Y and O in molten 316L stainless steel (SS), and a cluster dynamics model to evaluate the kinetic evolution and size distribution of Y-O nanoparticles in as-fabricated 316L SS ODS alloys. The model-predicted particle sizes exhibit good agreement with experimental measurements across various LPBF process parameters, i.e., laser power (110–220 W) and scanning speed (150–900 mm/s), demonstrating the reliability and predictive power of the modeling approach. The multiscale approach can be used to guide the future design of experimental process parameters to control oxide nanoparticle characteristics in LPBF-manufactured ODS alloys. Additionally, our approach introduces a novel strategy for understanding and modeling the thermodynamics and kinetics of precipitation in high-temperature systems, particularly molten alloys. Full article
(This article belongs to the Special Issue High-Performance Alloys and Steels)
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12 pages, 12269 KiB  
Article
Exceptional Strength–Ductility Combinations of a CoCrNi-Based Medium-Entropy Alloy via Short/Medium-Time Annealing after Hot-Rolling
by Yongan Chen, Dazhao Li, Zhijie Yan, Shaobin Bai, Ruofei Xie, Jian Sheng, Jian Zhang, Shuai Li and Jinzhong Zhang
Materials 2024, 17(19), 4835; https://doi.org/10.3390/ma17194835 - 30 Sep 2024
Viewed by 801
Abstract
Strong yet ductile alloys have long been desired for industrial applications to enhance structural reliability. This work produced two (CoCrNi)93.5Al3Ti3C0.5 medium-entropy alloys with exceptional strength–ductility combinations, via short/medium (3 min/30 min) annealing times after hot-rolling. Three [...] Read more.
Strong yet ductile alloys have long been desired for industrial applications to enhance structural reliability. This work produced two (CoCrNi)93.5Al3Ti3C0.5 medium-entropy alloys with exceptional strength–ductility combinations, via short/medium (3 min/30 min) annealing times after hot-rolling. Three types of intergranular precipitates including MC, M23C6 carbides, and L12 phase were detected in both samples. Noticeably, the high-density of intragranular L12 precipitates were only found in the medium-time annealed sample. Upon inspection of the deformed substructure, it was revealed that the plane slip is the dominant deformation mechanism of both alloys. This is related to the lower stacking fault energy, higher lattice friction induced by the C solute, and slip-plane softening caused by intragranular dense L12 precipitates. Additionally, we noted that the stacking fault and twinning act as the mediated mechanisms in deformation of the short-time annealed alloy, while only the former mechanism was apparent in the medium-time annealed alloy. The inhibited twinning tendency can be attributed to the higher energy stacking faults and the increased critical twinning stress caused by intragranular dense L12 precipitates. Our present findings provide not only guidance for optimizing the mechanical properties of high/medium-entropy alloys, but also a fundamental understanding of deformation mechanisms. Full article
(This article belongs to the Special Issue High-Performance Alloys and Steels)
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