Hot stamping of ultra-thin titanium sheets: mechanical properties, fracture limit and process verification

IF 2.6 3区材料科学 Q2 ENGINEERING, MANUFACTURING

International Journal of Material Forming Pub Date : 2024-12-27 DOI:10.1007/s12289-024-01874-4

Xianglu Zhang, Nan Guo, Yuhang Xia, Xu Zhao, Daijun Yang, Junying Min, Pingwen Ming, Cunman Zhang

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Abstract

Owing to the competitive advantages such as a high strength-to-weight ratio and excellent corrosion resistance, ultra-thin titanium sheets are considered one of the most promising bipolar plate substrates for proton exchange membrane fuel cells and are receiving increasing attention. However, due to their limited formability at room temperature, titanium bipolar plates are challenging to form, especially as the complexity of the flow channels increase continuously. In this study, the flow behavior and mechanical properties of ultra-thin titanium sheets at elevated temperatures were investigated, and their fracture limits were characterized to provide guidance for determining the process window. Finally, a lab-scale titanium bipolar plate was trial-fabricated using hot stamping at 700 ℃ with an on-site electric heating system. The results reveal that both the forming limit and dimensional accuracy of the titanium bipolar plates can be clearly improved, confirming the feasibility of the hot stamping process.

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超薄钛板热冲压：力学性能、断裂极限及工艺验证

由于超薄钛板具有高强度重量比和优异的耐腐蚀性等竞争优势，被认为是质子交换膜燃料电池最有前途的双极板衬底之一，并受到越来越多的关注。然而，由于其在室温下的可成形性有限，钛双极板的成形具有挑战性，特别是随着流动通道的复杂性不断增加。在本研究中，研究了超薄钛板在高温下的流动行为和力学性能，并对其断裂极限进行了表征，为工艺窗口的确定提供指导。最后，利用现场电加热系统，在700℃温度下进行热冲压，试制了实验室规模的钛双极板。结果表明，热冲压工艺可以明显提高钛双极板的成形极限和尺寸精度，证实了热冲压工艺的可行性。

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来源期刊

International Journal of Material Forming ENGINEERING, MANUFACTURING-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.10

自引率

4.20%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal publishes and disseminates original research in the field of material forming. The research should constitute major achievements in the understanding, modeling or simulation of material forming processes. In this respect ‘forming’ implies a deliberate deformation of material. The journal establishes a platform of communication between engineers and scientists, covering all forming processes, including sheet forming, bulk forming, powder forming, forming in near-melt conditions (injection moulding, thixoforming, film blowing etc.), micro-forming, hydro-forming, thermo-forming, incremental forming etc. Other manufacturing technologies like machining and cutting can be included if the focus of the work is on plastic deformations. All materials (metals, ceramics, polymers, composites, glass, wood, fibre reinforced materials, materials in food processing, biomaterials, nano-materials, shape memory alloys etc.) and approaches (micro-macro modelling, thermo-mechanical modelling, numerical simulation including new and advanced numerical strategies, experimental analysis, inverse analysis, model identification, optimization, design and control of forming tools and machines, wear and friction, mechanical behavior and formability of materials etc.) are concerned.