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

这个博士项目是谢菲尔德大学先进金属领域的CDT和劳斯莱斯(德比)低合金钢领域的合作项目，旨在弥合实验室小规模热处理测量与大规模制造过程中所经历的条件之间的差距。对于制造来说，这是一个具有挑战性的步骤，因为在重量只有几克的实验室样本中观察到的行为，并不总是与数百吨重的部件直接相关。了解这些差异是如何产生的，是将实验室环境中可以准确和常规测量的内容与大规模工业过程的优化和健壮性联系起来的关键。该项目的主要主题是：1)建立低合金钢结构、压力容器和高完整性螺栓等级的相变和机械性能的介观测量能力；2)探索材料内在变化的影响；这可能是由于成分偏析或加工变异性；3)通过定义模型的关键输入并根据需要进行热物理性能测量，进一步完善对部件在炉子加热和液体淬火过程中的热传递的理解。

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.