COMPARISON OF HOT DUCTILITY BEHAVIOR OF MICROALLOYED STEELS WITH DIFFERENT B-, CR-, NI- AND TI-CONTENT

1,2 GONTIJO Marina
Co-authors:
2 HOFLEHNER Christian 3 ILIE Sergiu 3 SIX Jakob 2 SOMMITSCH Christof
Institutions:
1 K1-MET GmbH, Linz, Austria, EU, marina.gontijo@k1-met.com
2 Institute of Materials Science, Joining and Forming, Graz University of Technology, Graz, Austria, EU, christian.hoflehner@tugraz.at, christof.sommitsch@tugraz.at
3 voestalpine Stahl Linz GmbH, Linz, Austria, EU, sergiu.ilie@voestalpine.com, jakob.six@voestalpine.com
Conference:
30th Anniversary International Conference on Metallurgy and Materials, Brno, Czech Republic, EU, May 26 - 28, 2021
Proceedings:
Proceedings 30th Anniversary International Conference on Metallurgy and Materials
Pages:
385-390
ISBN:
978-80-87294-99-4
ISSN:
2694-9296
Published:
15th September 2021
Proceedings of the conference have already been published in Scopus and we are waiting for evaluation and potential indexing in Web of Science.
Metrics:
426 views / 260 downloads
Abstract

The continuous casting process requires permanent investigation and innovative improvements due to its large application in steel production. A good hot ductility behavior is essential to avoid the formation of defects during slab casting. The behavior of two low alloyed steels, with different compositions in B-, Cr-, Ni- and Ti-content, was compared to understand the features that might bring improvements in hot ductility, and consequently reduce the occurrence of defects. The first alloy investigated presents a low content of all elements and the second has a composition with a higher fraction of the alloying elements referred to. Hot tensile tests after in situ melting of the samples were performed to reveal the hot ductility behavior of the each microalloyed steel. The results of final reduction of area showed a much better ductility of the second steel, alloyed with higher B, Cr, Ni and Ti-content, in comparison to the first. Initial microstructure analysis was performed as a means of better evaluating the effects of the temperatures and strain rate applied in both steels. Furthermore, precipitation kinetics of both steels were calculated using the MatCalc software, determining the expected mean radius, number density and phase fraction of the predicted precipitates. Possible reasons for the changes seen experimentally are discussed based on both, simulations and microstructure analysis.

Keywords: Continuous casting, low alloyed steel, hot ductility, hot tensile test, precipitates

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Scroll to Top