Abstract
The phenomenon of delayed fracture in three austenitic manganese-based Twinning-Induced Plasticity steels is investigated by means of video observation and magnetic measurements. Delayed fracture is observed in the direction perpendicular to the rolling direction, in coincidence with the highest α′-martensite fraction in a deep-drawn cup. The formation of a small fraction of α′-martensite, irrespective of the chemical composition examined, is indicative of the formation of crack initiation sites. We propose an intermittent crack propagation concept and model for the phenomenon of delayed fracture.
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Acknowledgments
This research was carried out under the project number MC10.07292 in the framework of the Research Program of the Materials innovation institute (M2i) (www.m2i.nl). The support of M2i and Tata Steel is gratefully acknowledged. The authors want to thank M. de Bruine and J. Heijne (Tata Steel) for their technical support in the deep-drawing experiments. The authors also would like to thank B. Berkhout (Tata Steel) for his contribution to the delayed fracture tests.
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Manuscript submitted October 16, 2012.
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van Tol, R.T., Zhao, L., Bracke, L. et al. Investigation of the Delayed Fracture Phenomenon in Deep-Drawn Austenitic Manganese-Based Twinning-Induced Plasticity Steels. Metall Mater Trans A 44, 4654–4660 (2013). https://doi.org/10.1007/s11661-013-1807-7
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DOI: https://doi.org/10.1007/s11661-013-1807-7