Modelling of thermomechanical processing during multi-pass rolling of advanced steels

人们越来越需要开发基于钢铁的创新解决方案，以满足加拿大各地日益增长的基础设施挑战。目前有几个主要的政府和私营部门的倡议，要求开发具有优异强度和韧性的新型钢板。其中一些举措包括加拿大海军的现代化和石油和天然气管道的建设。在汽车行业，开发新型钢材的压力最为明显。对新钢材开发的推动导致了钢材成分的重大变化。这些成分变化对AHSS热机械加工的影响还有待研究。本项目的目的是开发一种基于物理的模型，用于热轧含有超出传统使用范围的合金化添加剂的新型低合金钢。将对合金元素在运动边界上的相互作用和热轧过程中析出相的演变进行基础性研究。这些基础研究的结果将被整合到一个稳健的多通道沉淀模型中，该模型可以预测颗粒尺寸的演变、沉淀硬化和流动应力的变化。该模型将与一个广泛使用的商用轧钢机负荷预测软件包相连接，以便准确地预测热轧过程中的轧钢机负荷。这项工作将与工业合作伙伴密切合作，最终将使Evraz Inc.N.A.和Stelco(加拿大两家领先的钢铁生产商)能够优化在其位于里贾纳和伊利湖的工厂生产的钢铁的化学和热机械加工参数。新的钢材将使Stelco扩大其在汽车板材行业的市场份额。它还将使Evraz能够为石油和天然气行业生产一系列具有竞争力的产品。作为这项资助的一部分，总共将有1名博士生、2名硕士学生和1名研究助理接受培训。

There is a growing need to develop innovative steel-based solutions that can meet the growing infrastructure challenges across Canada. There are presently several major government and private-sector initiatives that require the development of novel steel plates with excellent strength and toughness. Some of these initiatives include the modernization of the Canadian Navy and the construction of oil and gas pipelines. Nowhere is the pressure to develop novel steels more apparent than in the automotive industry. The push to develop new steels has resulted in important changes in steel compositions. The impact of these composition changes on the thermo-mechanical processing of AHSS has yet to be explored. The aim of the present project is to develop a physically-based model for the hot-rolling of novel low alloy steels that contain alloying additions beyond the traditionally used range. Fundamental studies will be carried out on the interaction of alloying elements at moving boundaries and on precipitate evolution during hot rolling. The results of these fundamental studies will be integrated into a robust multi-pass precipitation model that predicts grain-size evolution, precipitation hardening and flow stress changes. The model will be linked to a widely used commercial mill-load prediction software package in order to accurately predict mill loads during hot rolling. This work will be carried out in close collaboration with the industrial partners and will ultimately allow EVRAZ Inc. N.A. and Stelco (two of Canada's leading steel produces) to optimize the chemistry and thermomechanical processing parameters of the steels produced at their facilities in Regina and Lake Erie. The new steels will allow Stelco to extend its market share in the automotive sheet sector. It would also allow EVRAZ to produce a wide range of competitive product for the oil and gas industry. In total, 1 PhD student, 2 MSc students and one Research Associate will be trained as part of this grant.