Novel Insights into Hot Sheet Metal Forming of High-Performance 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: 25 April 2025 | Viewed by 1842

Special Issue Editors


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Guest Editor
1. Eurecat, Centre Tecnològic de Catalunya, Manresa, Barcelona, Spain
2. Division of Mechanics of Solid Materials, Luleå University of Technology, Luleå, Sweden
Interests: fracture mechanics; fatigue; advanced high strength steels
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Guest Editor
Division of Machine Elements, Luleå University of Technology, Luleå, Sweden
Interests: high temperature tribology; friction and wear in dry contacts; tribomaterials; surface engineering for friction and wear control
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The biannual CHS2 conference series has, after eight very successful conferences since 2008, grown into the leading platform for scientific exchange in hot forming technologies.

The interest in thermo-mechanical forming processes of high-performance materials has grown significantly in recent years. The automotive sector has been the main driver of this development, pushed by the constant demands on passenger safety and environmental regulations. Press hardening of boron steels is now a mature technology, deployed all around the world. It has proven to be unbeatable for forming complex shape parts and easy forming of high strength materials with reduced spring-back. It also allows for producing parts with tailored properties under accurate process monitoring. While being the solution to many lightweight actions, the hot forming industry will also face its own challenges to meet the global sustainability goals. Improving efficiency in heating technology and minimizing scrap, as well as the introduction of green or fossil-free steels will help us to shift to a higher degree of circularity.

Research and Development both on the academic as well as on the industrial level is one of the most important prerequisites for continuous innovation in hot forming of high-performance materials and open new scenarios to exploit their lightweight potential. The 9th CHS2 conference will be held in Nashville (USA) and aims to keep pushing the innovation trends in press hardening and related thermo-mechanical processes and to boost their application to other markets (such as heavy duty and industrial vehicles, aerospace, etc.), new applications (new needs from e-mobility), and new materials (light alloys, CFRP, hybrid materials, etc.) while considering sustainability and circularity topics.

Prof. Dr. Daniel Casellas
Prof. Dr. Jens Hardell
Guest Editors

Manuscript Submission Information

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Keywords

  • press hardening
  • hot forming
  • process modelling
  • microstructure
  • surface engineering and coatings
  • process monitoring
  • fatigue and fracture
  • friction and wear

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Published Papers (1 paper)

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Research

19 pages, 7888 KiB  
Article
Novel Aging Warm-Forming Process of Al-Zn-Mg Aluminum Alloy Sheets and Influence of Precipitate Characteristics on Warm Formability
by Wan-Ling Chen and Rong-Shean Lee
Metals 2024, 14(8), 844; https://doi.org/10.3390/met14080844 - 24 Jul 2024
Viewed by 1228
Abstract
Concurrently improving the formability and post-formed strength of Al-Zn-Mg alloy sheets is crucial for producing high-strength parts with complex shapes. A novel process of aging warm-forming (AWF) to form solution heat-treated and water-quenched aluminum alloy sheets is proposed in this paper. The as-quenched [...] Read more.
Concurrently improving the formability and post-formed strength of Al-Zn-Mg alloy sheets is crucial for producing high-strength parts with complex shapes. A novel process of aging warm-forming (AWF) to form solution heat-treated and water-quenched aluminum alloy sheets is proposed in this paper. The as-quenched AA 7075 sheet was first pre-aged and then formed at the desired temperature. The automotive paint–bake process was then utilized as the second aging step to achieve the target strength of the formed part. Additionally, the post-formed strength and warm formability of specimens under the AWF process conditions, as well as the warm-forming of various heat-treated Al-Zn-Mg alloy sheets proposed in previous studies, were compared through tensile and limit dome height tests. Precipitate characteristics of specimens subjected to different warm-forming process conditions were examined to understand their impact on warm formability. The warm formability of Al-Zn-Mg alloy sheets was significantly enhanced, and the post-formed strength achieved was more than 90% of the strength of as-received AA 7075-T6 sheets under the AWF process condition. The results demonstrated the feasibility of this novel AWF process to manufacture Al-Zn-Mg alloy stamped parts for improved spring-back, formability, and good overall post-formed strength. The results also indicate that microstructural characteristics in Al-Zn-Mg alloy sheets under different warm-forming process conditions have a noticeable influence on warm formability and final mechanical properties. Full article
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