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Failure analysis of cast open-cell iron based foams from the submicron to the macro-scale

从亚微米到宏观尺度铸造开孔铁基泡沫的失效分析

基本信息

批准号：
385154737
负责人：
Professorin Dr.-Ing. Claudia Fleck
金额：
--
依托单位：
Fachgebiet Werkstofftechnik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/385154737?language=en
关键词：
Failure analysis cast open cell

项目摘要

Open cell steel foams are promising candidates for impact absorbing applications. They are generally inexpensive, possess a low density, and, as compared to aluminium foams, they combine a higher strength with high ductility and toughness. Former work, nevertheless, nearly always focuses on closed- and open-cell aluminium foams. As aluminium alloys have a profoundly different deformation and failure behaviour as compared to steels, and because the knowledge on bulk steel cannot simply be transferred to foams because of the small size of the struts and the different casting conditions, further development of steel foams relies on improved knowledge on the microstructure/mechanical-property-relationships of these foams. In this study, we therefore plan to investigate the mechanical behaviour and the microstructure of a novel cast steel foam and its struts on different length-scales from the sub-µm to cm range, by combination of mechanical testing of foams and single, extracted struts with 2D microscopy and 3D tomography methods. The results will be compared with those from former work on austenitic steel foams, and correlations between the different microstructures and the foam properties will be deduced. The relationships between the strut microstructure and the mechanical properties on the different length-scales will be integrated and used to suggest possible improvements in the microstructure and the production process of steel foams.

开孔泡沫钢是冲击吸收应用的有希望的候选者。它们通常是廉价的，具有低密度，并且与铝泡沫相比，它们联合收割机更高的强度与高延展性和韧性。然而，以前的工作几乎总是集中在闭孔和开孔泡沫铝上。由于铝合金与钢相比具有完全不同的变形和失效行为，并且由于支柱的小尺寸和不同的铸造条件，关于散装钢的知识不能简单地转移到泡沫中，因此泡沫钢的进一步开发依赖于对这些泡沫的微观结构/机械性能关系的改进知识。因此，在这项研究中，我们计划研究一种新型铸钢泡沫及其支柱在亚微米至厘米范围内的不同长度尺度上的力学行为和微观结构，通过将泡沫和单个提取支柱的力学测试与2D显微镜和3D断层扫描方法相结合。将所得结果与以往奥氏体泡沫钢的研究结果进行了比较，并推导出不同显微结构与泡沫性能之间的关系。不同长度尺度上的支柱微观结构和力学性能之间的关系将被整合，并用于建议泡沫钢的微观结构和生产过程中可能的改进。