Mechanistic understanding the mechanism of hydrogen-facilitated stress corrosion cracking - DiffH-SCC

从机理上理解氢促应力腐蚀开裂的机理 - DiffH-SCC

• 批准号: EP/X039404/1
• 负责人: Sergio Lozano-Perez
• 金额: $ 24.26万
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Fellowship
• 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=EP%2FX039404%2F1
• 关键词: Mechanistic; understanding; mechanism; hydrogen; facilitated

Nuclear energy is forecast by the European Commission to make a significant contribution to achieving a low-carbon, affordable energy, enhancing energy security during the development of renewables. However, stress corrosion cracking (SCC) is one of the biggest obstacles, as it induces unexpected failure to nuclear power plant components, threatening operational safety. Mitigating SCC requires a thorough understanding of its mechanisms, of which the current understanding is limited. In recent years, the applicant researcher and his colleagues have found that diffusible hydrogen plays a critical role in the evolution of SCC, which is beyond the existing understanding. Therefore, this project aims to uncover new SCC mechanisms in Ni-based alloys (materials used in nuclear power plants) from the perspective of the role of diffusible hydrogen, based on the good foundation of research by the applicant. The multi-scale experimental approach will focus on in-situ materials characterisation of Ni-based alloys during mechanical testing with in-situ hydrogen charging. This project employs experiments at different length-scales: a) crack initiation at the macroscale; b) strain distribution in different microstructures; and c) mechanical testing of single microstructures at the microscale. This research will make use of state-of-the-art equipment from interdisciplinary domains including materials engineering, electrochemistry, electron microscopy, mechanical engineering, and corrosion fields. The proposal emphasises the transfer of knowledge of advanced techniques between the host and researcher, while employing various training processes (including transferable skills) for both academia and non-academia sectors. Through effective and open dissemination and exploitation procedures, the results have the potential to provide practical suggestions and guidance to our end-users for producing alloys with higher SCC-resistance for a safer utilisation of nuclear energy.

欧盟委员会预测核能将为实现低碳，负担得起的能源，增强可再生能源的能源安全做出重大贡献。但是，应力腐蚀破裂（SCC）是最大的障碍之一，因为它会导致意外的核电站组件失败，从而威胁着操作安全。缓解SCC需要对其机制有透彻的理解，而当前的理解是有限的。近年来，申请人的研究人员及其同事发现，扩散的氢在SCC的进化中起着至关重要的作用，SCC超出了现有的理解。因此，基于申请人的良好研究基础，该项目旨在从Ni基合金（用于核电站的材料）中发现新的SCC机制（用于核电站的材料）。多尺度的实验方法将重点介绍与原位氢充电期间Ni基合金的原位材料表征。该项目在不同的长度尺度上采用实验：a）宏观上的裂纹启动； b）不同微观结构中的应变分布； c）在微观尺度上对单个微观结构进行机械测试。这项研究将利用跨学科领域的最先进设备，包括材料工程，电化学，电子显微镜，机械工程和腐蚀场。该提案强调了主机和研究人员之间先进技术知识的转移，同时采用各种培训过程（包括可转移技能），以实现学术界和非学术领域。通过有效和开放的传播和开发程序，结果有可能向我们的最终用户提供实用的建议和指导，以生产具有更高SCC耐药性的合金，以更安全地利用核能。