University of Oulu

Alatarvas, Tuomas; Jaskari, Matias; Kaijalainen, Antti; Koskenniska, Sami; Asikainen, Jari; et al. (2021) Applicability of heat transfer and solidification simulations in investigating microstructural banding in continuously cast steel. In: Menghuai Wu (ed.) Proceedings of the 9th International Conference on Modeling and Simulation of Metallurgical Processes in Steelmaking. 5-7 October 2021. Virtual conference, pp. 473-480. Asmet.

Applicability of heat transfer and solidification simulations in investigating microstructural banding in continuously cast steel

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Author: Alatarvas, Tuomas1; Jaskari, Matias1; Kaijalainen, Antti1;
Organizations: 1University of Oulu, Finland
2Ovako Imatra Oy, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.8 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2021101250690
Language: English
Published: Asmet - austrian society for metallurgy and materials, 2021
Publish Date: 2021-10-12
Description:

Abstract

Microstructural banding is observed as alternating microstructures in cast steel products, parallel to cast/rolling direction. Banding, causing hardenability issues and anisotropy of mechanical properties, is considered to originate from the interdenritic segregation during the solidification of steel. In this study, a three-dimensional heat transfer model (3DHTM) was used to simulate the steady-state local temperatures in a casting strand of 0.34C low alloy carbon steel, taking into account both primary and secondary cooling as well as other casting parameters. The calculated temperature profiles for a set of selected locations along the strand were used as input data for a solidification and microstructure model (SMM) for the continuous casting of steel. To assess the microstructure of the cast bloom, the prior austenite grain size, dendrite arm spacing, and the magnitude of elemental microsegregation between the dendrites were calculated with the selected temperature profiles for the steel grade. For validation purposes, bloom and bar samples were prepared from industrial trials. The calculated results are compared to the microstructural characterization of austenite grain size, and local elemental concentrations obtained with electron probe microanalyzer (EPMA). Based on the results, elemental microsegregation and microstructural banding is assessed, affected by casting parameters and the total composition of steel. Additionally, a brief discussion of the segregation between the bloom and bar samples is presented.

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ISBN: 978-3-200-07994-6
Pages: 473 - 480
Host publication: Proceedings of the 9th International Conference on Modeling and Simulation of Metallurgical Processes in Steelmaking. 5-7 October 2021. Virtual conference
Host publication editor: Wu, Menghuai
Conference: International Conference on Modeling and Simulation of Metallurgical Processes in Steelmaking, STEELSIM
Type of Publication: A4 Article in conference proceedings
Field of Science: 216 Materials engineering
215 Chemical engineering
Subjects:
Funding: This research was carried out within the research project ISA – Intelligent Steel Applications. The authors would like to acknowledge Business Finland for funding the research.
Copyright information: © 2021 ASMET.