ADVANCES IN THE FUNDAMENTALS OF LIQUID METAL PROCESSING AND CASTING OPERATIONS.

液态金属加工和铸造操作基础的进步。

• 批准号: RGPIN-2020-05890
• 负责人: GUTHRIE, Roderick
• 金额: $ 4.01万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=761085
• 关键词: ADVANCES; FUNDAMENTALS; LIQUID; METAL; PROCESSING

ADVANCES IN THE FUNDAMENTALS OF LIQUID METAL PROCESSING AND CASTING OPERATIONS. The primary aims of this discovery grant are to continue our research on 1) improving the intrinsic quality of all liquid steel melts, and 2) developing a better process, Horizontal Single Belt Casting, to cast aluminium and steel sheets versus the current Direct Chill (DC), and Conventional Continuous Casting (CCC), fixed-mold, technologies. Over the next five years, we plan to further explore the potential for this high productivity, novel-casting process. We wish to study in much greater detail, the role of meniscus movements and oscillations in HSBC processes. For this, we will use Computational Fluid Dynamics analyses of the liquid metal and gas flows within the small meniscus region, about 0.1-1mm thick, that separates our refractory delivery systems for liquid metal flowing from a slot nozzle, onto the horizontally moving, flat belt. We need to evaluate these CFD predictions against experimental findings that are revealed from the quality of the bottom surfaces of cast strips. Bottom strip surfaces can vary from perfect, to poor, depending on the stability of the meniscus, and the suppression of back flows. We will intend to extend this fundamental research to demonstrate HSBC's superior capabilities in casting thin sheets of high entropy light-weight alloys (Alx-Co-Cr-Fe-Ni), bulk metallic glasses (Fe-6B-15C-15Cr-14Mo-2Y), and Fe- 3%Si, and new Fe-6% silicon, electrical steels. These tests will include subsequent rolling of sheet material down to final desired product gauge, and development of suitable mechanical and physical properties. Our second project involves removing exogenous inclusions of all sizes down to the micron size range, from liquid steel, prior to its final solidification. This is important for many steel properties, such as fatigue, surface quality, isotropic properties, etc. Our success over the past five years was to generate micro bubbles in water, for the range of ladle shroud velocities pertaining to generic ladle-tundish-mold facilities used in industry, and using these to remove very small inclusions (20-70 microns diameter). We must now use a low temperature melting point, liquid metal alloy (Cerrolow 136), with physical properties much closer to those of liquid steel (surface tension, wetting angles, density) so that we can quantitatively demonstrate, experimentally, the sizes of micro bubbles that we should be able to produce in liquid steel ladle-tundish-mould systems, for steel velocities ranging from 0.5-5m/s. We aim to re-develop and improve on our original LiMCA (Liquid Metal Cleanliness Analyzer) system, to measure micro bubble sizes in low temperature liquid metals. This will provide quantitative information for forming micro bubbles in commercial steel systems for removal of inclusions, in response to the interest expressed by RTIT/RTMP steelworks in Quebec, and Nippon Steel Corp., Japan.

液态金属加工和铸造基础理论的进展这项发现补助金的主要目的是继续我们的研究：1）提高所有液态钢熔体的内在质量，2）开发一种更好的工艺，水平单带铸造，以铸造铝和钢板，而不是目前的直接冷却（DC）和常规连续铸造（CCC），固定模具，技术。 在接下来的五年里，我们计划进一步探索这种高生产率、新颖的铸造工艺的潜力。我们希望更详细地研究汇丰过程中弯月面运动和振荡的作用。为此，我们将使用计算流体动力学分析小弯月面区域内的液体金属和气体流动，厚度约为0.1- 1 mm，该区域将我们的耐火材料输送系统分开，用于从狭缝喷嘴流入水平移动的平带上的液体金属。我们需要根据铸带底面质量的实验结果来评估这些CFD预测。根据弯月面的稳定性和对回流的抑制，底部带材表面可以从完美到差变化。我们打算扩展这项基础研究，以证明汇丰在铸造高熵轻质合金（Alx-Co-Cr-Fe-Ni）、大块金属玻璃（Fe-6 B-15 C-15 Cr-14 Mo-2 Y）、Fe- 3%Si和新型Fe-6% Si电工钢薄板方面的上级能力。这些测试将包括随后将板材轧制到最终所需的产品规格，并开发合适的机械和物理性能。我们的第二个项目涉及在最终凝固之前从钢水中去除所有尺寸小至微米尺寸范围的外源夹杂物。这对许多钢的性能都很重要，如疲劳、表面质量、各向同性等。我们在过去五年中的成功是在水中产生微气泡，适用于工业中使用的通用钢包长水口速度范围，并使用这些来去除非常小的夹杂物（直径20-70微米）。我们现在必须使用一种熔点低的液态金属合金（Cerrolow 136），它的物理性质（表面张力、润湿角、密度）与液态钢的物理性质非常接近，这样我们就可以通过实验定量地证明，对于0.5- 5 m/s的钢速度，我们应该能够在液态钢钢包-结晶器-结晶器系统中产生的微气泡的大小。我们的目标是重新开发和改进我们原来的LiMCA（液态金属清洁度分析仪）系统，以测量低温液态金属中的微气泡尺寸。这将为在商业钢系统中形成微气泡以去除夹杂物提供定量信息，以响应魁北克的RTIT/RTMP钢厂和新日铁公司所表达的兴趣，日本