Modeling heat flow and microstructure of microalloyed steels produced on an industrial run out table

微合金钢是一种非常经济实惠的钢，适用于需要改善机械性能(即强度、硬度、蠕变和韧性)的广泛应用。仔细控制钢的化学成分，再加上通过热加工和冷成形对板坯进行受控加工，可以实现微合金钢所需的性能。通常，这些性能是在热机械加工中通过结合晶粒细化、溶质强化和沉淀硬化来实现的。实现这些特性的关键操作之一是对用途表(ROT)的操作。在这里，带钢在最后一次轧制道次后冷却，以获得所需的带钢组织和性能。在模拟ROT和CCT图上的热损失方面的最新进展为进一步提高和控制成品的组织和性能以及产品从盘管开始到结束的均匀性和一致性提供了机会。在本项目中，我们的目标是使用不同牌号的管线微合金钢来进一步验证该ROT的热传导-组织演化模型。该项目将包括进行工厂试验，生成钢材的CCT图，对钢壳的热损失进行数学建模，以及钢的转变。在这个四年的项目中，每年将有两名研究生接受培训。对这些用于管道应用的高强度微合金钢的制造、组织、性能和性能的基本了解将对加拿大产生重大的社会经济效益。

Micro-alloyed steels are very cost-effective steels for a wide range of applications where improved mechanical properties, namely strength, hardness, creep and toughness, are desired. Careful control of the chemistry of the steel, coupled with controlled processing of the slabs through hot working and cold forming result in achieving the desired properties for microalloyed steels. Typically, these properties are achieved metallurgically in thermomechanical processing through a combination of grain refinement, solute strengthening and precipitation hardening. One of the key operations in achieving these properties is on the run out table (ROT). Here the strip steel is cooled after the last rolling pass to achieve the desired microstructure and properties of the skelp. Recent advances in modeling the heat losses on the ROT and the CCT diagram provides the opportunity to further enhance and control the finished microstructure and properties as well as the homogeneity and consistency of the product from the start of a coil to its end. In this project, we aim to further validate this combined heat transfer-microstructure evolution model for the ROT using different grades of pipeline microalloyed steels. This project will involve the carrying out of plant trials, coupled with the generation of CCT Diagrams for the steels, mathematical modeling of the heat loss from the skelp coupled with the steel transformation. Two Graduate Students per year will be trained in this 4 year project. The fundamental understanding of the fabrication, microstructure, properties and performance of these higher strength microalloyed steel grades for pipeline applications will have significant socio-economic benefits to Canada.