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.

先进的高强度钢（AHSS）代表了减轻车辆重量的关键组成部分，从而减少燃料消耗相关的温室气体排放。与传统的高强度钢相比，AHSS在保持高表现的同时具有显着的强度。提高的表现能够提高组件的复杂性，从而导致单个零件更少和制造灵活性。但是，由于它们的高合金含量 - 锰高达5％，硅高达2％，铝含量高达2％ - AHSS板通常表现出横向表面裂纹和由固体壳热撕裂引起的横向表面裂缝和中心线裂纹。这些裂缝导致钢铁生产商的操作延迟和产品质量差。在与安大略省汽车行业的主要生产商和钢铁供应商Arcelormittal Dofasco的合作研究中，我们打算研究AHSS热泪的形成和传播。拟议的研究分为两个研究领域。首先是开发一种新的多物理模型，该模型同时模拟了连续铸造过程中柱状和柱状/equiaxed Grains网络的凝固，渗透，进食和变形，以建模热撕裂。第二个是对半固体AHS的构成行为的直接测量，以确定该合金家族容易受到热撕裂的程度。拟议的研究计划的联合目标是确定减少AHSS合金中热撕裂形成的最佳加工途径。