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Improvement of internal quality by controlling the microstructure of microalloyed cast steel

Funded under: FP5-GROWTH


The aim of the project was to determine process conditions leading to optimised internal quality of continuous cast steel products. Parameters controlling solidification structure and segregation have been examined by measurements and numerical modelling in a multi partner collaboration coordinated by Dillinger Huttenwerke.

Micro and macro structural features were studied, such as phase distribution, the transition from columnar to equiaxed (GET) morphology, dendrite arm spacing, segregation, cleanness and porosity. Imatra Steel has varied bloom casting parameters such as secondary cooling, superheat, casting speed and mould EMS. The latter was found dominant for structure and segregation. Dillinger Huttenwerke have related dendrite morphology to solidification variables and expressed secondary arm spacing solidification for columnar growth. Laboratory experiments at IRSID have elucidated the mechanisms of equiaxed growth and internal defect formation in plain carbon steels. The rheology of semi- solid alloys was investigated by extrusion tests on Pb-Sn alloys.

MPI has developed a numerical model for solidification morphology and phases in continuous casting. GET results are in agreement with laboratory and plant data. The effect of various process parameters has been analysed. At Helsinki University of Technology, a model for austenite decomposition and microstructure formation in cast low alloy steels has been developed and was applied to the bloom and billet section. It was validated by comparing microstructure, phase fraction and hardness with measurements. Through coupling with earlier developed packages a model of the whole process has been achieved. The final report summarises all correlations in detail and their potential use for process optimisation. on.

Additional information

Authors: HARSTE K, AG der Dillinger Huttenwerke, Dillingen (DE);WEISGERBER B, AG der Dillinger Huttenwerke, Dillingen (DE);TACKE K.H, Max-Planck-Institut fur Eisenforschung, Dusseldorf (DE);GNAUK J, Max-Planck-Institut fur Eisenforschung, Dusseldorf (DE);BOBADILLA M, IRSID, Maizieres-Ies-Metz (FR);LOVATO G, IRSID, Maizieres-Ies-Metz (FR);CROCENZO M, IRSID, Maizieres-Ies-Metz (FR);HATONEN T, Imatra Steel Oy Ab, Imatra (FR)
Bibliographic Reference: EUR 19491 EN (2001), pp.178. Euro: 26.50
Availability: Available by EUR-OP sales agent
ISBN: ISBN: 92-894-1223-2
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