Multiscale Characterisation Of Creep Deformation Of Materials For Fusion Reactors.

聚变反应堆材料蠕变变形的多尺度表征。

• 批准号: 2739878
• 金额: --
• 依托单位: The Open University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2739878
• 关键词: Multiscale; Characterisation; Creep; Deformation; Materials

Due to the extreme conditions seen in a fusion reactor, material performance is a critical factor in the future production of fusion power plants. Structural materials must survive high operating temperatures and severe irradiation damage for long periods of time, and so creep is a critical failure mechanism that requires rapid development in fundamental understanding.Materials for fusion are low technology readiness level, novel and only available in small volumes. Therefore, there is a need to extract as much information from a given amount of material as possible. The aim of this project is to work towards doing just that for material behaviour in the creep regime, primarily using Grade 91 steel as a model material for EUROFER 97. This work will utilise the inherent scalability of the image processing technique Digital Image Correlation (DIC) to quantify creep deformation at multiple length scales concurrently on the same sample, using a combination of visible light and electron imaging using a scanning electron microscope (SEM). The macroscale DIC will facilitate the sample to be designed to experience a spatial stress gradient, reducing the amount of material required to characterise creep behaviour when compared to uniaxial testing. The microstructural scale DIC will be used to observe grain scale phenomena across the range of stress states experienced by the sample. This combination of test scales will enable macroscale behaviour to be explained by grain-scale behaviour, developing a more nuanced insight into the material's creep mechanisms and failure modes. This is achievable due to the unique DIC-monitored creep testing facilities at the Open University and the existing expertise at Open University and UKAEA in microstructural-scale DIC.

由于聚变反应堆的极端条件，材料性能是未来聚变发电厂生产的关键因素。结构材料必须能够长时间承受高工作温度和严重的辐照损伤，因此蠕变是一种关键的失效机制，需要快速发展基础知识。聚变材料技术成熟度低、新颖且只能小批量供应。因此，需要从给定量的材料中提取尽可能多的信息。该项目的目的是努力实现蠕变状态下的材料行为，主要使用 91 级钢作为 EUROFER 97 的模型材料。这项工作将利用图像处理技术数字图像相关 (DIC) 固有的可扩展性）结合使用可见光和扫描电子显微镜 (SEM) 的电子成像，同时量化同一样品上多个长度尺度的蠕变变形。宏观 DIC 将有助于样品设计为经历空间应力梯度，与单轴测试相比，减少表征蠕变行为所需的材料量。微观结构尺度 DIC 将用于观察样品所经历的应力状态范围内的晶粒尺度现象。这种测试尺度的组合将使宏观行为能够通过晶粒尺度行为来解释，从而对材料的蠕变机制和失效模式有更细致的了解。这一目标的实现得益于开放大学独特的 DIC 监测蠕变测试设施以及开放大学和 UKAEA 在微观结构规模 DIC 方面的现有专业知识。