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: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=706850
• 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.

钢铁新产品开发继续对经济社会作出重要贡献。钢铁发展步伐的加快主要是由汽车行业的需求推动的。在这里，先进的高强度钢在减轻车辆重量方面发挥着至关重要的作用，从而提高燃油经济性，成为减少温室气体排放的一个关键方面。这些钢具有吸引人的特性，包括卓越的强度-成形性平衡和耐碰撞性，这是通过增加合金添加量（例如锰、硅）和严格的工艺控制而获得的。热轧机跳动台上的冷却路径起着至关重要的作用，因为它可用于调整从具有面心立方 (FCC) 晶体结构的奥氏体到具有体心立方 (BCC) 晶体结构的铁素体的相变结构。具体来说，根据钢铁化学和加工，可以设计出由不同转变产物组成的复杂多相微观结构，这为性能设计提供了新的范例。特别是在热轧硅含量较高的钢时，可能会形成持久的氧化皮，影响跳动台的冷却效率，导致不可接受的性能变化。因此，开发优化的跳动表处理策略以减轻规模的影响非常重要。该项目旨在增进有关水垢对传热影响的基础知识。将进行专门的中试规模跳动表测试来量化热提取率，并将采用先进的表征技术来确定鳞片结构和化学成分。该拟议项目是与安赛乐米塔尔多法斯科（加拿大领先的汽车钢板生产商）密切合作进行的，旨在为设计优化冷却策略提供新的见解。 该项目为博士生提供培训机会，他们将通过将传热研究与微观结构表征相结合来培养独特的技能水平。