The Role of Grain Boundary Oxidation on Surface Crack Formation under Continuous Casting Conditions

Author:

Krobath Roman,Bernhard Christian,Ilie Sergiu,Six Jakob,Hahn Susanne,Pennerstorfer Paul

Abstract

Abstract This paper represents an extended abstract of a study presented at the ESTAD 2019 conference. In this contribution, the influence of different cooling strategies on the formation of intergranular surface cracks is observed with in-situ bending experiments under continuous casting conditions. The steel composition is equal to a 0.17 wt.% C construction steel. It is investigated with and without Al deoxidation at bending temperatures of 1100 °C to 700 °C. The results show the most critical situation prevailed for each testing condition at 900 °C. A holding temperature of 1200 °C leads to a selective grain boundary oxidation and therefore to the formation of notches at the austenite grain boundaries, which are the cause for stress concentrations and easier formation of cracks during a subsequent tensile deformation at critical temperatures. The experiments reveal a partially stronger influence of this phenomenon on the steel without Al deoxidation.

Funder

Montanuniversität Leoben

Publisher

Springer Science and Business Media LLC

Reference8 articles.

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2. Szekeres, E. S.: A Review of Strand Casting Factors Affecting Transverse Cracks; in: Proceedings of the 6th International Conference on Clean Steel, Balatonfüred, Hungary, 2002, pp 324–338

3. Burden, M. H.; Funnel, G. D.; Whitaker, A. G.; Young, J. M.: Origins of Defects in Continuously Cast Blooms Produced on a Curved Mould Machine, in: Proceedings Solidification and Casting of Metals, London, England, 1979, pp 279–286

4. Wolf, M.: Fine Intergranular Surface Cracks in Bloom Casting, Transactions of the Iron and Steel Institute of Japan, 24 (1984), no. 5, pp 351–358

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