Small Scale Laboratory to Large Scale Component Manufacture - Scaling of Heat Treatment Behaviour of Low Alloy Steels

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This doctoral project is a collaboration between the CDT in Advanced Metallics at the University of Sheffield and Rolls Royce (Derby) in low alloy steel, aiming to bridge the gap between small scale laboratory heat treatment measurements and the conditions experienced during large scale manufacturing processes. This is a challenging step for manufacturing, as behaviour observed in laboratory specimens weighing as little as a few grams is not always directly relevant to components weighing hundreds of tonnes. Understanding how these differences arise is key to relating what can be measured accurately and routinely in a laboratory environment to the optimisation and robustness of large scale industrial processes. The major themes of this project are to;1) Establish a meso-scale measurement capability for phase changes and mechanical performance in structural, pressure vessel and high integrity bolting grades of low alloy steels,2) Explore the effect of inherent variation in the material; this could be due to compositional segregation or processing variability,3) Further refine the understanding of heat transfer during furnace heating and liquid quenching of components through defining key inputs to models and undertaking measurements of thermo-physical properties as required.