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Metals
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Casting Process, Processing Deformation and Microstructure Optimization of Advanced Metallic...
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Casting Process, Processing Deformation and Microstructure Optimization of Advanced Metallic Materials

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: 20 December 2024 | Viewed by 2218

Special Issue Editors

Dr. Guohuai Liu

E-Mail Website
Guest Editor
The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
Interests: special alloy casting; solidification control; processing innovation; material and process modeling; ceramic crucibles
Prof. Dr. Zhaodong Wang

E-Mail Website
Guest Editor
The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
Interests: advanced steel rolling-heat treatment; new technology of reduced rolling; heat treatment process technology; material forming-heat treatment organization control
Dr. Yanmei Li

E-Mail Website
Guest Editor
The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
Interests: steel matrix composites; high entropy alloy; material composition design

Special Issue Information

Dear Colleagues,

Metal casting, as a traditional foundational technology, can directly manufacture various complex components required in the automotive, aerospace and other fields. However, problems such as pores and coarse grains that may occur during the metal casting process affect the performance of materials. In addition, some special metals are processed and deformed to satisfy the needs of industrial applications. However, specific microstructure evolution also occurs during the process of processing and deformation, which affects the quality of the product. Therefore, understanding and controlling the microstructural evolution of metals and alloys during casting or deformation processes will be able to effectively control the mechanical properties of the material. Optimizing and regulating the casting process and deformation ability of metals is one of the important directions for the future development of metal materials.

All articles concerning high-strength titanium alloys, nickel-based superalloys, high-entropy alloys, aluminum alloys, magnesium alloys, and their new casting methods or deformation technologies are welcome.

Dr. Guohuai Liu
Prof. Dr. Zhaodong Wang
Dr. Yanmei Li
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

  • high-temperature alloy
  • high-entropy alloys
  • high-strength Al and Mg alloys
  • new casting method
  • grain refinement
  • material and process modeling
  • thermal deformation
  • processing innovation

Published Papers (3 papers)

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Research

18 pages, 7831 KiB  
Article
New Insights into the Ingot Breakdown Mechanism of Near-β Titanium Alloy: An Orientation-Driven Perspective
by Xianghong Liu, Tao Wang, Xiaolong Ren, Jie Fu, Liang Cheng, Bin Zhu and Kaixuan Wang
Metals 2024, 14(7), 792; https://doi.org/10.3390/met14070792 - 7 Jul 2024
Viewed by 505
Abstract
The ingot breakdown behavior of a typical near-β titanium alloy, Ti-55511, was investigated by various multi-pass upsetting processes. Particular emphasis was placed on the breakdown mechanism of the ultra-large β grains. The results showed that the upsetting far above the β-transus yielded uniform [...] Read more.
The ingot breakdown behavior of a typical near-β titanium alloy, Ti-55511, was investigated by various multi-pass upsetting processes. Particular emphasis was placed on the breakdown mechanism of the ultra-large β grains. The results showed that the upsetting far above the β-transus yielded uniform and refined macrostructure with relatively coarse grain size. In contrast, subtransus deformation within the (α + β) dual-phase field caused severe strain localization and macroscale shear bands. It was found that the static recrystallization during the post-deformation annealing was determined by the preferential grain orientations, which were closely related to the processing conditions. During β-working, the stable <001>-oriented grains were predominant and fragmentized mainly via a so-called “low-angle grain boundary merging” mechanism, even under a fairly low deformation. However, the vast <001> grain area was unbeneficial for microstructural conversion since it provided minor nucleation sites for the subsequent annealing. In contrast, the α/β-working produced the majority <111>-orientated grains, which were strongly inclined to strain localization. Highly misoriented deformation/shear bands were massively produced within the <111> grains, providing abundant nucleation sites for static recrystallization and, hence, were favorable for microstructural refinement. Furthermore, the intrinsic causes for deformation nonuniformity were discussed in detail, as well as the competition between microstructural homogeneity and refinement. Full article
(This article belongs to the Special Issue Casting Process, Processing Deformation and Microstructure Optimization of Advanced Metallic Materials)
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14 pages, 4014 KiB  
Article
Development and Process Integration of an Alternative Demoulding System for High-Pressure Die Casting Using a Contoured Vacuum Mask
by Alexander Haban, Andreas Schilling, Martin Fehlbier, Toni Karalus and Stefanie Felicia Kracun
Metals 2024, 14(6), 691; https://doi.org/10.3390/met14060691 - 11 Jun 2024
Viewed by 642
Abstract
This study presents the development and process integration of an alternative demoulding system for high-pressure die casting. The system is aimed at the removal of large structural castings, which are becoming increasingly popular in the industry under the terms mega- and gigacasting. The [...] Read more.
This study presents the development and process integration of an alternative demoulding system for high-pressure die casting. The system is aimed at the removal of large structural castings, which are becoming increasingly popular in the industry under the terms mega- and gigacasting. The development differs from conventional systems in the fact that it completely avoids ejectors and realises the demoulding via the principle of vacuum suction cups. Preliminary tests were carried out in which various established materials for vacuum cups were initially identified and the suitability of the selected cup concept was investigated by varying influencing variables from the high-pressure die casting. These tests showed that a suction pad material combination of an elastomer with a thermal barrier and an aramid felt on the surface provides the best results under the given process boundary conditions. Based on this, a multi-segmented vacuum mask with contour adaptation to the casting to be removed was developed. This vacuum mask is used to build up the holding force between the casting and the removal device. The necessary removal force is applied via pneumatic cylinders. The functional capability of the concept and the system integration was verified by experiments on a real die-casting mould for test specimens. The shrinkage and demoulding process can be successfully modelled in the simulation and the real measured demoulding force is only approx. 15% higher than in the simulation. During demoulding in the high-pressure die-casting process, vacuums of up to 88.7% were achieved at temperatures up to 395 °C. Full article
(This article belongs to the Special Issue Casting Process, Processing Deformation and Microstructure Optimization of Advanced Metallic Materials)
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13 pages, 22964 KiB  
Article
The Influence of Cr Addition on the Microstructure and Mechanical Properties of Fe-25Mn-10Al-1.2C Lightweight Steel
by Rui Bai, Yunfei Du, Xiuli He and Yaqin Zhang
Metals 2024, 14(6), 687; https://doi.org/10.3390/met14060687 - 10 Jun 2024
Viewed by 715
Abstract
The influence of Cr addition on the microstructure and tensile properties of Fe-25Mn-10Al-1.2C lightweight steel was investigated. The characteristics of the microstructures and deformation behavior were carried out through X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron backscatter diffraction [...] Read more.
The influence of Cr addition on the microstructure and tensile properties of Fe-25Mn-10Al-1.2C lightweight steel was investigated. The characteristics of the microstructures and deformation behavior were carried out through X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron backscatter diffraction (EBSD), and room temperature tensile testing. Fe-20Mn-12Al-1.5C steel without Cr exhibited a fully austenitic single phase. With the addition of Cr, the volume fraction of ferrite continuously increased. When the content of Cr exceeded 5 wt%, the precipitation of Cr7C3 carbides was observed. In the steel with 5 wt% Cr, the quantity of κ carbides remarkably decreased, indicating that the addition of 5 wt% Cr significantly inhibited the nucleation of κ-carbides. As the Cr content increases from 0 wt% to 5 wt%, the austenite grain sizes were 8.8 μm and 2.5 μm, respectively, demonstrating that Cr alloying is an effective method of grain refinement. Tensile strength increased slightly while elongation decreased with increasing Cr content. As the Cr content exceeded 5 wt%, the yield strength increased but the elongation drastically decreased. The steel with 2.5 wt% Cr achieved a synergistic improvement in strength and ductility, exhibiting the best tensile performance. Full article
(This article belongs to the Special Issue Casting Process, Processing Deformation and Microstructure Optimization of Advanced Metallic Materials)
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