Computational Design of Complex Microstructures for Advanced Engineering Alloys

先进工程合金复杂微观结构的计算设计

• 批准号: RGPIN-2020-05431
• 负责人: Militzer, Matthias
• 金额: $ 2.4万
• 依托单位: University of British Columbia
• 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=758191
• 关键词: Computational; Design; Complex; Microstructures; Advanced

High performance steels and advanced titanium alloys are essential materials for lightweighting in the transportation, energy and construction sectors. For example, 10% weight reduction in vehicles and aircrafts, respectively, decreases greenhouse gas emission by 6-8% and is also critical to enable alternative fuel vehicles. Thus, any improvement in processing and in-service performance of advanced steels and titanium alloys contributes significantly to engineering solutions with reduced environmental impact. In both materials, phase transformations occur in the solid state, i.e. transitions between different crystal structures as the temperature is increased or decreased during processing. Design of microstructures through these phase transformations is a key metallurgical tool to tailor the mechanical properties for specific applications. Phase field modelling is a powerful tool to describe and visualize the evolution of microstructures with complex morphologies as frequently found in steels and titanium alloys. In addition, phase field modelling is also an appropriate method to simulate the fracture behaviour in a wide range of materials. A physically consistent phase field approach has yet to be developed to predict for steels and titanium alloys representative multi-phase microstructures with complex morphologies and the resulting fracture behaviour. Depending on the processing path polygonal, plate-like and irregularly shaped transformations products may form thereby offering an enormous potential to optimize properties. The objectives of the proposed program are to develop a through-process phase field model for phase transformations in steels and titanium alloys with a multiplicity of transformation products and to predict the fracture behaviour of the resulting microstructures. Further, the role of potentially non-homogeneous distributions of alloying elements will be explored with phase field simulations to design microstructures using the concept of chemical patterning as a new avenue to improve material properties, e.g. fracture toughness. The program will offer training for two PhD students and five undergraduate summer students who will acquire a highly sought state-of-the-art skill set in computational engineering. The novelty and significance of the proposed research will be the advancement of the phase field method to a microstructure design tool for complex-phase steels and titanium alloys. A particularly exciting aspect of the proposed program is that microstructure simulations will be coupled with the prediction of the resulting fracture behavior in the phase field simulation framework, which will constitute an important novelty in the field. The proposed modelling method is expected to provide an attractive computational tool for next generation industrial process models by guiding microstructure design to optimize processing and properties of advanced metallic alloys as an important aspect of digital manufacturing.

高性能钢和先进钛合金是交通、能源和建筑领域轻量化的重要材料。例如，车辆和飞机重量分别减轻 10%，可减少 6-8% 的温室气体排放，这对于替代燃料汽车的发展也至关重要。因此，先进钢和钛合金加工和使用性能的任何改进都将对减少环境影响的工程解决方案做出重大贡献。在这两种材料中，相变发生在固态，即在加工过程中随着温度升高或降低而在不同晶体结构之间发生转变。通过这些相变设计微观结构是为特定应用定制机械性能的关键冶金工具。 相场建模是描述和可视化钢和钛合金中常见的具有复杂形态的微观结构演变的强大工具。此外，相场建模也是模拟各种材料断裂行为的合适方法。尚未开发出物理一致的相场方法来预测具有复杂形态的钢和钛合金代表性多相微观结构以及由此产生的断裂行为。根据加工路径，可能会形成多边形、板状和不规则形状的转变产品，从而为优化性能提供了巨大的潜力。 该项目的目标是开发具有多种相变产物的钢和钛合金相变的全过程相场模型，并预测所得微观结构的断裂行为。此外，将通过相场模拟探索合金元素潜在非均匀分布的作用，以使用化学图案概念作为改善材料性能的新途径来设计微观结构。断裂韧性。 该项目将为两名博士生和五名暑期本科生提供培训，他们将获得计算工程方面备受追捧的最先进技能。该研究的新颖性和意义在于将相场方法发展为复杂相钢和钛合金的微观结构设计工具。该计划的一个特别令人兴奋的方面是，微观结构模拟将与相场模拟框架中所产生的断裂行为的预测相结合，这将构成该领域的重要新颖性。所提出的建模方法有望通过指导微观结构设计来优化先进金属合金的加工和性能，从而为下一代工业过程模型提供有吸引力的计算工具，作为数字制造的一个重要方面。