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H. Radlwimmer, P. Wiehoff, S. Ilie, J. Six, E. Kozeschnik:
"Computational and experimental analysis of hot ductility during continuous casting of micro-alloyed steel";
Talk: THERMEC´2016, Graz; 2016-05-29 - 2016-06-03.

The vast majority of today's steel is produced on basis of continuous casting technology. Thermal gradients and mechanical loading due to roll contact and bulging expose the strand to severe thermal stresses. The most common continuous casting facilities utilize vertical casting, bending and straightening operations. Particularly, the latter process introduces additional mechanical loads on the strand. For steel, thermo-mechanical stresses are especially hazardous in the region of reduced ductility, typically between 1200 °C and 600 °C. In this work, we investigate the hot ductility of a micro-alloyed steel both experimentally on a Gleeble 1500 thermo-mechanical testing machine as well as computationally by means of the thermokinetic software MatCalc. One series of experiments is performed for linear cooling from 1320 °C to testing temperature, a second series includes superimposed temperature troughs, which mimic the strand cooling profile in a more realistic way by taking into account the contacts between strand and rolls. Comparison between simulated and experimentally observed ductility are in good agreement. The loss of ductility can clearly be associated with the formation of deformation-induced micro-alloying precipitates.

hot ductility, precipitation simulation