Effect of pressurized spray cooling on microstructure gradients in thicker hot strip products

加压喷雾冷却对较厚热轧带钢产品微观结构梯度的影响

• 批准号: 537307-2018
• 负责人: Militzer, Matthias
• 金额: $ 4.86万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=691390
• 关键词: Effect; pressurized; spray; cooling; microstructure

The development of new steel products continues to play an important role in the economy and society. The ever increasing pace of steel development is driven by the demands of critical sectors like automobile manufacturing, construction and energy. Developing new steels requires to deepen the knowledge in the underlying metallurgy and constant modernization of steel production facilities. Accelerated cooling has become a key technology to produce thermo-mechanically controlled processed hot-rolled steels with fine grained and/or multi-phase microstructures and the mechanical properties that are now increasingly required for demanding applications. Using well-designed processing paths rather than alloying additions is an attractive approach to manufacture these high-performance steels. The cooling path on the runout table 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 path, different transformation products can be obtained to create complex multi-phase microstructures which offer new paradigms for the design of properties. The Canadian steel industry, including ArcelorMittal Dofasco (AMD), is actively engaged in upgrading their runout table cooling capabilities. A particular challenge is here the production of thicker gage steels, e.g. line pipe, because the intense cooling, e.g. in a pressurized spray unit, may lead to through-thickness microstructure/property variations. The development of process models will have an increasing impact for making these value-added products with high quality and minimum variability. The proposed project is conductecd in collaboration with AMD to develop a next generation runout table model that combines heat transfer and phase transformation kinetics for line pipe steels. Experimental studies will be carried out on a pilot scale runout table facility and the thermo-mechanical processing laboratory to provide guidance for the model development. The proposed model will be validated with industrial data. The project offers training opportunities for three graduate students.

新型钢铁产品的开发继续在经济和社会中发挥着重要作用。汽车制造、建筑和能源等关键行业的需求推动了钢铁发展的步伐不断加快。开发新钢材需要加深对基础冶金的了解，并不断对钢铁生产设施进行现代化改造。加速冷却已成为生产具有细晶和/或多相显微组织和机械性能的热机械控制加工热轧钢的关键技术，现在越来越多地要求苛刻的应用。使用精心设计的加工路径而不是添加合金是制造这些高性能钢的一种有吸引力的方法。跳动台上的冷却路径起着至关重要的作用，因为它可以用来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。具体而言，根据钢的化学性质和加工路径，可以获得不同的转化产物，形成复杂的多相组织，为性能设计提供了新的范式。包括安赛乐米塔尔（AMD）在内的加拿大钢铁行业正积极致力于升级其跳动表冷却能力。这里的一个特殊挑战是生产较厚的规格钢，例如管线，因为在高压喷射装置中进行的强烈冷却可能导致整个厚度的微观结构/性能变化。过程模型的开发将对制造这些高质量和最小可变性的增值产品产生越来越大的影响。拟议的项目是与AMD合作进行的，旨在开发下一代跳动表模型，该模型结合了线管钢的传热和相变动力学。实验研究将在中试规模的跳动台设施和热机械加工实验室进行，为模型开发提供指导。提出的模型将用工业数据进行验证。该项目为三名研究生提供了培训机会。