[SY-F6] Symposium F-6

[SY-F6] Characterisation and modelling of drawn martensite

^○Marius Gintalas¹, Miguel A. Santajuana², Carlos Garcia-Mateo², David San-Martin², Jose A. Jiménez², Wim Van Haver³, Pedro E. J. Rivera-Diaz-del-Castillo⁴ (1.The University of Cambridge, Department of Materials Science & Metallurgy, 27 Charles Babbage Road, Cambridge CB3 0FS, UK, 2.Materalia research group, Department of Physical Metallurgy, Spanish National Centre for Metallurgical Research (CENIM-CSIC), Avda. Gregorio del Amo 8, Madrid E-28040, Spain, 3.NV Bekaert SA, Bekaertstraat 2, Zwevegem B-8550, Belgium, 4.The University of Lancaster, Department of Engineering, Engineering Building, Lancaster University, Gillow Ave, Bailrigg, Lancaster LA1 4YW, UK)

There has been an extensive work on microstructural refinement via severe plastic deformation, which leads to improved strength in metallic materials. However, due to the complexity of the microstructural changes involved, the mechanisms responsible for the strength enhancement of the cold deformed marteniste have not been completely revealed. This work summarises advanced experimental and modelling activities carried out on heavily drawn martensite. These include slow heating high resolution dilatometry, high resolution transmission electron microscopy and high resolution X-ray diffraction conducted with both synchrotron and lab x-ray sources. The purpose of employing various characterisation techniques is to collect data to gain a comprehensive understanding on the microstructural evolution with respect to applied strain. The modelling work aims to propose a novel martensite strength model to describe the relationship between microstructure and mechanical properties, including the effects of applied strain upon severe plastic deformation. The strengthening model is validated using stress-strain data of martensite drawn at various strain levels.