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A whole-life approach to the development of high integrity welding technologies for Generation IV fast reactors

开发第四代快堆高完整性焊接技术的全寿命方法

基本信息

批准号：
EP/L015013/1
负责人：
Michael Smith
金额：
$ 130.55万
依托单位：
University of Manchester
依托单位国家：
英国
项目类别：
Fellowship
财政年份：
2014
资助国家：
英国
起止时间：
2014 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FL015013%2F1
关键词：
whole life approach development integrity

项目摘要

"Weld modelling" is a powerful tool in understanding the structural performance of welded structures. Conventional continuum-mechanics-based predictions of the stresses generated by welding have achieved considerable success in understanding the in-service performance and degradation mechanisms of welds in the UK's nuclear reactor fleet. However their practical use is currently limited to materials that do not undergo so-called solid state phase transformation (SSPT) during welding, since the presence of SSPT makes it necessary to predict changes in the material microstructure in order to predict the stresses. In addition, the microstructural changes imposed by welding have a profound influence on a weld's resistance to creep, thermal ageing, oxidation, stress corrosion and other in-service degradation mechanisms, and upon its sensitivity to the presence of cracking.The Fellowship research programme aims to extend conventional weld modelling into a multi-disciplinary tool that can predict both continuum parameters such as stress & distortion, and microstructural parameters such as grain size and shape, the occurrence of secondary phases, and precipitate distributions, and hence both directly predict long term structural performance and be used for "virtual prototyping " of weld processes and procedures for novel welding processes. Success offers the prospect of better understanding of in-service performance of welds in both the existing UK nuclear reactor fleet, and in any industrial sector where the long term structural performance of welds is important. It will also aid the choice of weldment materials, joint design and welding process for structural welds in new-build nuclear power plants, and in advanced Generation IV designs that may be built on a longer time frame.

“焊接建模”是理解焊接结构的结构性能的有力工具。传统的连续力学为基础的预测焊接产生的应力已经取得了相当大的成功，在理解在英国的核反应堆舰队的焊缝在役性能和退化机制。然而，它们的实际应用目前仅限于在焊接过程中不经历所谓的固态相变（SSPT）的材料，因为SSPT的存在使得有必要预测材料微观结构的变化以预测应力。此外，焊接所带来的微观结构变化对焊缝的抗蠕变、热老化、氧化、应力腐蚀和其他服役退化机制以及对裂纹存在的敏感性有着深远的影响。该研究计划旨在将传统的焊接建模扩展为一种多学科工具，可以预测应力和变形等连续参数，和微观结构参数，例如晶粒尺寸和形状、第二相的出现和沉淀物分布，因此两者都可以直接预测长期的结构性能，并用于焊接工艺的“虚拟原型“和新焊接工艺的程序。成功提供了前景，更好地了解现有的英国核反应堆舰队，在任何工业部门的焊缝的长期结构性能是重要的在服务中的性能。它还将有助于新建核电厂结构焊缝的焊接材料选择，接头设计和焊接工艺，以及可能在更长时间内建造的先进的第四代设计。