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Title: Computer modelling of the microstructural evolution during the cooling phase of hot rolled strip steel
Author: Davies, A. C.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 1997
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The modelling of the run out table in the production of hot strip steel requires the investigation into the effect of transformation kinetics of the particular steel under consideration. This requires quantifying the effects of temperature, austenite grain size and the extent of recrystallisation of the austenite before exiting the final finishing stand. In conjunction with the transformation effects on the run out table it is important that to the temperature profile of the strip in known. Therefore, because of the influence of temperature of the strip on the transformation kinetics of the material it is imperative that any model developed to predict the transformation behaviour should include a coupled thermal - microstructural analysis. The coupled two dimensional run out table model developed in the project, will allow investigations into the temperature and microstructural analysis of the cooling phase of hot strip rolling using parameters taken from the mill. The analysis of the thermal characteristics on the run out table is based on the two dimensional finite difference formulation using the energy balance procedure. This work is based upon data available from an existing one dimensional model developed by British Steel Strip Products. The investigation into the transformation characteristics of the steel under consideration (Carbon Manganese Grade) was carried out using isothermal testing conditions in the non-deformed and deformed condition. Run out table parameters such as Strip temperature, velocity and strip speed and detailed run out table temperature plots have been obtained for various cooling conditions based upon the simplified heat transfer coefficient. The temperature predictions of the strip can be seen to be as expected during the cooling in hot strip rolling. To enable further investigations into the effects of rolling parameters such as deformation schedule, extent of recrystallisation prior to cooling and the effect of varying temperature profile and structure across the strip the model has been written to be coupled into a comprehensive hot rolling model which is also being developed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (D.Eng.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available