Effect of Scale on Runout Table Heat Transfer

水垢对跳动台传热的影响

• 批准号: 560259-2020
• 负责人: Militzer, Matthias
• 金额: $ 1.75万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=721592
• 关键词: Effect; Scale; Runout; Table; Heat

The development of new steel products continues to be an important contributor in the economy and society. The increased pace of steel development is primarily driven by the demands of the automotive industry. Here, advanced high strength steels take a crucial role to reduce vehicle weight and thereby improving fuel economy as a critical aspect to decrease greenhouse gas emissions. These steels have attractive properties including superior strength-formability balance and crash worthiness that are obtained by increased alloying additions (e.g. Mn, Si) and stringent process control. The cooling path on the runout table in a hot mill takes a critical role as it can be used to tailor the phase transformation from austenite with a face-centred cubic (FCC) crystal structure to ferrite with a body-centred cubic (BCC) crystal structure. In detail, depending on steel chemistry and processing, complex multi-phase microstructures can be engineered consisting of different transformation products which offer new paradigms for the design of properties. In particular during hot rolling of steels with higher Si contents a persistent oxide scale may form that affects cooling efficiencies on the runout table leading to unacceptable property variations. Thus, it is important to develop optimized runout table processing strategies to mitigate the role of scale. The proposed project is designed to advance fundamental knowledge on the effect of scale on heat transfer. Dedicated pilot-scale runout table tests will be conducted to quantify heat extraction rates and advanced characterization techniques will be employed to determine scale structure and chemistry. The proposed project is conducted in close collaboration with ArcelorMittal Dofasco - Canada's leading producer of automotive steel sheets - and aims to provide new insight in designing optimized cooling strategies. The project offers training opportunities for a PhD student who will develop a unique skill level by combining heat transfer studies with microstructure characterization.

新钢铁产品的开发仍然是经济和社会的重要贡献者。钢铁开发速度的提高主要是由汽车行业的需求驱动的。在这里，先进的高强度钢在减轻车辆的重量方面发挥了至关重要的作用，从而改善了燃油经济性，作为减少温室气体排放的关键方面。这些钢具有吸引人的特性，包括高强度的平衡和通过增加合金添加（例如MN，SI）和严格的过程控制获得的崩溃值。热磨机中的跳动表上的冷却路径至关重要，因为它可用于定制从具有面部为中心的立方（FCC）晶体结构到具有身体为中心（BCC）晶体结构的铁素体的相变的相变。在详细的情况下，根据钢化学和加工，可以设计复杂的多相微观结构，由不同的转换产品组成，这些转换产品为物业设计提供了新的范式。特别是在具有较高Si含量的钢的热卷中，持续的氧化物量表可能会影响跳动表上的冷却效率，从而导致不可接受的性质变化。因此，重要的是制定优化的跳线表处理策略来减轻规模的作用。拟议的项目旨在促进有关量表对传热影响的基本知识。将进行专用的试点尺度的跳动表测试，以量化排放速率，并将采用高级表征技术来确定规模的结构和化学。拟议的项目是与加拿大领先的汽车钢板生产商Arcelormittal Dofasco密切合作进行的，旨在为设计优化的冷却策略提供新的见解。 该项目为博士生提供了培训机会，该博士生将通过将传热研究与微观结构表征相结合来发展独特的技能水平。