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Recent Research on Superplastic Forming of Metals and Alloys

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

Deadline for manuscript submissions: closed (20 May 2024) | Viewed by 374

Special Issue Editor


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Guest Editor
Department of Mechanical Engineering, National Central University, Chung-li, Taiwan
Interests: superplastic forming; Magnesium-lithium alloy; mechanical property of materials
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Special Issue Information

Dear Colleagues,

Superplasticity is the property exhibited by worked/processed metals and alloys which involve, under tensile loading, very high elongation without necking until failure. Superplastic forming (SPF) is mostly an excellent technique used for gas-forming complex-shaped sheet components based on superplastic metals. A major limitation of SPF is the slow forming time due to the material’s intrinsic characteristics. This long cycle time is not a problem for small-volume production as in the aero-industry, and SPF is very advantageous in forming Ti alloys which are hard to deal with using other manufacturing processes.

However, a car body using aluminum alloy sheets that adopt SPF can only be practical when a forming cycle time is reduced. Due to this demand, quick plastic forming (QPF) has evolved and General Motors Corporation led the way in developing models with AA5083, such as Chevrolet Malibu.

Quick plastic forming is essentially a pseudo-SPF process that uses a slightly lower processing temperature and higher gas pressure. In recent years, attempts to employ QPF in manufacturing consumer products other than car bodies, such as smart-phone cases, have been studied.

Concurrently, SPF and diffusion bonding (DB) are advanced technologies that can achieve a more novel structure. This SPF/DB process can successfully make hollow fan blades installed in airplane engines. Any other processed SPF/DB products are highly encouraged.

The main aim of this Special Issue is to present recent advances in the superplastic forming process.

This Special Issue includes high-quality original research papers, review papers, and case studies that deal with every aspect of SPF, QPF, and SPF/DB.

Prof. Dr. Shyong Lee
Guest Editor

Chu Chun Cheng
Guest Editor Assistant

Manuscript Submission Information

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Keywords

  • superplasticity
  • metals and alloys
  • superplastic forming
  • quick plastic forming
  • diffusion bonding

Published Papers (1 paper)

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Research

15 pages, 7891 KiB  
Article
Influential Factors on Diffusion Bonding Strength as Demonstrated by Bonded Multi-Layered Stainless Steel 316L and 430 Stack
by Da-Wei Liu, Chun-Nan Lin, Wei-Shuai Lin, Shyong Lee and Jyh Gwo
Materials 2024, 17(15), 3713; https://doi.org/10.3390/ma17153713 (registering DOI) - 27 Jul 2024
Abstract
In this study, we optimized the parameters of diffusion bonding on multi-layered stainless steel 316L and 430 stacks. The preparation process for diffusion bonding is crucial, as the bonding surfaces need to be polished and meticulously cleaned to ensure a smooth bonding process. [...] Read more.
In this study, we optimized the parameters of diffusion bonding on multi-layered stainless steel 316L and 430 stacks. The preparation process for diffusion bonding is crucial, as the bonding surfaces need to be polished and meticulously cleaned to ensure a smooth bonding process. We fabricated twelve-layer plates consisting of 55 mm × 55 mm × 3 mm and 100 mm × 50 mm × 3 mm dimensions, and the bonding response was investigated by evaluating the tensile strength of the bonding zone under varying bonding conditions, with a bonding temperature ranging from 1000 to 1048 °C, a bond time ranging from 15 to 60 min, pressure ranging from 10 to 25.3 MPa, and under a vacuum environment. SS430 exhibits a significantly higher compression creep rate than SS316L. The compressibility of diffusion welding materials does not impact the diffusion bonding strength. Multi-axial tensile strength tests confirmed strong bonding joint strength in various axes. The tensile strengths of monolithic and Diffusion bonding (DB) specimens tested in parallel are essentially identical. The optimized diffusion bonding parameters (Condition G2C: 1048 °C/25.3 MPa/15 min) are ideal for producing SS316L stainless steel cores in compact heat exchangers, offering a superior bonding quality and reduced costs. These findings have practical implications for the production of stainless steel cores in compact heat exchangers, demonstrating the relevance and applicability of our research. Full article
(This article belongs to the Special Issue Recent Research on Superplastic Forming of Metals and Alloys)
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