Multi-physics modelling of semi-solid deformation and hot tearing in advanced high strength steels

先进高强度钢半固态变形和热撕裂的多物理场建模

• 批准号: 500496-2016
• 负责人: Phillion, AndréBernard
• 金额: $ 2.92万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=618411
• 关键词: Multi; physics; modelling; semi; solid

Advanced high strength steels (AHSS) represent a key component in reducing vehicle weight and hence reducing fuel consumption related greenhouse gas emissions. In comparison to traditional high strength steels, AHSS achieve significant strength while retaining formability. The increased formability enables greater component complexity, which leads to fewer individual parts and more manufacturing flexibility. However, due to their high alloy contents - manganese up to 5%, silicon up to 2% and aluminum up to 2% - AHSS slabs routinely exhibit transverse surface cracks and centreline cracks caused by hot tearing of the solidifying shell. These cracks result in operational delays and poor product quality for steel producers. In this collaborative study with ArcelorMittal Dofasco, a major producer and supplier of steels to the automotive industry in Ontario, we intend to examine the formation and propagation of hot tears in AHSS. The proposed research is divided into two areas of study. The first is the development of a new multi-physics model that concurrently simulates the solidification, percolation, feeding, and deformation of a network of columnar and columnar/equiaxed grains during continuous casting, for modelling of hot tearing. The second is the direct measurement of the constitutive behaviour of semi-solid AHSS to determine the degree to which this alloy family is susceptible to hot tearing. The joint goal of the proposed research program is to identify the optimal processing routes for reducing hot tearing formation in AHSS alloys.

先进高强度钢（AHSS）是降低车辆重量的关键组成部分，从而减少与燃料消耗相关的温室气体排放。与传统的高强度钢相比，AHSS在保持可成形性的同时实现了显著的强度。提高的可成形性使组件更复杂，从而减少单个零件并提高制造灵活性。然而，由于其高合金含量-锰高达5%，硅高达2%，铝高达2% - AHSS板坯通常会出现横向表面裂纹和中心线裂纹，这些裂纹是由凝固壳的热撕裂引起的。这些裂缝导致钢铁生产商的操作延迟和产品质量差。在这项与安赛乐米塔尔多法斯科（ArcelorMittal Dofasco）（安大略汽车行业主要钢材生产商和供应商）的合作研究中，我们打算检查AHSS中热裂纹的形成和传播。拟议的研究分为两个研究领域。第一个是一个新的多物理模型，同时模拟凝固，渗流，进料和变形的柱状和柱状/等轴晶粒的网络在连续铸造过程中，热撕裂的建模的发展。第二个是直接测量半固态AHSS的本构行为，以确定该合金家族对热裂敏感的程度。拟议的研究计划的共同目标是确定减少AHSS合金热裂形成的最佳加工路线。