Effects of Chemical Composition, Ingot diameter and shape on Solidification and Macrosegregation in Large Size Ingots of High Strength Steels

化学成分、钢锭直径和形状对大尺寸高强度钢钢锭凝固和宏观偏析的影响

• 批准号: 536444-2018
• 负责人: Jahazi, MohammadM
• 金额: $ 6.19万
• 依托单位: École de technologie supérieure
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 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=754313
• 关键词: Effects; Chemical; Composition; Ingot; diameter

Large size forged blocks are used for the manufacturing of critical components such as shafts and dies in transportation and energy industries. The first step in producing such components is ingot casting. However, due to the large size of the ingots, chemically heterogeneous zones (macrosegregation) are produced which often cannot be eliminated during the subsequent heat treatment or forging operations leading to part non conformity and/or rejection. In recent years the demand for larger size ingots (up to 100 tons) has been continuously increasing and therefore it is of critical importance for the ingot casting/forging industry to develop methods and approaches that would allow producing large size ingots with no or little macrosegregation. The problem is even more acute in the North American context, because of the fierce competition from emerging manufacturing countries and new regulations that result in increased costs. To achieve this objective, a more in-depth knowledge of the interactions between material characteristics (composition, microstructure, etc.) and process parameters is required. The development of such knowledge base manufacturing process is the key objective of the present Collaborative Research and Development (CRD) project. In a previous collaboration with the industrial partner, Finkl Steel-Sorel, very interesting results were generated which resulted in significant progresses and savings for the industrial partner. In this project, the work will focus on studying parameters that were not addressed during the first phase, apply the developed findings to new alloys and ingot sizes and develop new methodologies that would allow producing high quality ingots and contribute to strengthening the position of the industrial partner as one of the world leaders in processing of large size ingots.Experimental study using advanced testing equipment will be conducted to develop material models describing the evolution of the microstructure. The developed material models will be implemented into Finite Element (FE) commercial codes to predict local microstructure heterogeneous zones and phase transformation characteristics in large size ingots. The research results will be validated ultimately at the industrial level.

大尺寸锻件用于制造运输和能源行业中的轴和模具等关键部件。生产此类部件的第一步是铸锭。然而，由于铸锭尺寸较大，会产生化学不均匀区域（宏观偏析），这些区域在后续热处理或锻造操作中通常无法消除，从而导致零件不合格和/或报废。近年来，对大尺寸钢锭（高达100吨）的需求不断增加，因此对于钢锭铸造/锻造行业来说，开发能够生产没有或很少宏观偏析的大尺寸钢锭的方法和途径至关重要。在北美，这个问题更加严重，因为来自新兴制造国家的激烈竞争以及导致成本增加的新法规。为了实现这一目标，需要更深入地了解材料特性（成分、微观结构等）和工艺参数之间的相互作用。这种知识库制造工艺的开发是当前协作研究与开发（CRD）项目的主要目标。在之前与工业合作伙伴 Finkl Steel-Sorel 的合作中，产生了非常有趣的结果，为工业合作伙伴带来了重大进展并节省了成本。在该项目中，工作重点是研究第一阶段未解决的参数，将研究结果应用于新合金和铸锭尺寸，并开发新方法，以生产高质量铸锭并有助于加强工业地位。合作伙伴是大尺寸铸锭加工领域的世界领先者之一。将使用先进的测试设备进行实验研究，以开发描述微观结构演变的材料模型。开发的材料模型将被应用到有限元（FE）商业代码中，以预测大尺寸铸锭的局部微观结构异质区和相变特征。研究成果最终将在工业层面得到验证。