Microstructure-based modelling of spot weld failure in third generation advanced high strength steels

第三代先进高强度钢点焊失效的基于微观结构的建模

• 批准号: 549807-2019
• 负责人: Biro, ElliotEJ
• 金额: $ 15.15万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Alliance 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=760329
• 关键词: Microstructure; based; modelling; spot; weld

To improve passenger safety and fuel economy, automotive companies have been integrating steels of increasing strength into the vehicle architecture. The newest materials of interest are third generation advanced high strength steels (3G AHSS) that have excellent forming and crash properties, but contain high carbon and alloying additions that create large variations in the mechanical properties within the weld zone. The structural integrity and crash performance of a 3G AHSS component is ultimately governed by these local heterogeneous properties that control the failure path and energy release. Since 3G AHSS have only recently become commercially available, there is insufficient knowledge of the constitutive and fracture properties of the critical sub-regions of the weld to accurately predict their behavior in full vehicle crash simulations. The considerable uncertainty surrounding the fracture behavior of 3G AHSS welds has led automotive companies to over-design 3G AHSS parts or to avoid their adoption.The proposed research will optimize the mechanical performance of resistance spot welds in two grades of 3G AHSS with ultimate tensile strengths (UTS) of 980 MPa and 1180 MPa, then develop a detailed understanding and predictive model of the failure behaviour during crash. This research will result in: (i) industrially-viable spot welding processes; (ii) a detailed characterization of weld microstructure and properties; (iii) an understanding of the mechanisms responsible for 3G AHSS spot weld failure; and (iv) the development of weld fracture models appropriate for industrial simulation, which will provide design tools for future generation lightweight automotive structures.The project outcomes will directly contribute to the competitiveness of the Canadian steel, parts, tooling, welding equipment and automotive manufacturers partnering on this project. Optimized welding parameters will be adopted into Canadian parts and assembly plants and the new simulation tools will be incorporated in automotive vehicle design and crash safety simulation, which will create market demand for these new steels.

为了提高乘客安全和燃油经济性，汽车公司一直将强度增加的钢整合到车辆建筑中。最新感兴趣的材料是第三代高强度钢（3G AHS），具有出色的形成和崩溃特性，但含有高碳和合金添加的添加剂，它们在焊接区域内的机械性能中产生了较大的变化。 3G AHSS组件的结构完整性和崩溃性能最终受这些控制故障路径和能量释放的局部异质性质的控制。由于3G AHS直到最近才获得市售，因此对焊缝关键子区域的组成型和断裂特性的了解不足，无法在完整的车辆崩溃模拟中准确预测其行为。围绕3G AHS焊缝断裂行为的严重不确定性导致汽车公司过度设计3G AHSS零件或避免采用其采用。拟议的研究将优化两种3G AHS的电阻焊缝的机械性能，并以980 MPA和1180 MPA和1180 MPA的最终预测的模型，并进行了预测的最终预测。 碰撞。这项研究将导致：（i）工业可行的现场焊接过程； （ii）韦尔德微结构和性能的详细表征； （iii）对导致3G AHSS斑点焊缝故障的机制的理解； （iv）开发适合工业模拟的焊缝裂缝模型，该模型将为未来的轻型汽车结构提供设计工具。项目成果将直接有助于加拿大钢铁，零件，工具，焊接设备和自动动力制造商在该项目中合作的竞争力。优化的焊接参数将被采用到加拿大零件和组装厂中，新的仿真工具将纳入汽车设计和碰撞安全模拟中，这将为这些新钢产生市场需求。