HOT DUCTILITY BEHAVIOR OF A CONTINUOUSLY CAST TI-NB MICROALLOYED STEEL

1 HOFLEHNER Christian
Co-authors:
1 BEAL Coline 1 SOMMITSCH Christof 2 SIX Jakob 2 ILIE Sergio
Institutions:
1 Graz University of Technology, Graz, Austria, office.imat@tugraz.at
2 voestalpine Stahl Linz GmbH, Linz, Austria
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
84-89
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
81 views / 43 downloads
Abstract

The hot ductility behaviour of a Ti-Nb micro alloyed steel was investigated to evaluate the probability of surface crack formation during the continuous casting process, by performing hot tensile tests. The testing temperatures are ranging from 1100 °C to 700 °C. The effects of testing temperature range and deformation rate on hot ductility were investigated. The results show that this steel exhibits poor ductility over almost the whole testing temperature range. The ductility starts to decrease at 1000 °C in the single phase γ-region, characterized by grain boundary sliding and surface cracks, reaches a minimum in the two-phase α-γ-region at 750 °C and slightly increases with decreasing testing temperature. Furthermore, low deformation rates severely decrease the ductility behaviour. Microstructural examinations and supplementary thermo-kinetic computer simulations revealed distinct Ti-Nb precipitation throughout the microstructure being responsible for the deteriorated materials hot ductility.

Keywords: Metallurgy, steel, continuous casting, hot ductility, low alloyed, testing methods
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