基本信息
项目批准号：51701141
申请代码：E0102
项目名称：低活化钢搅拌摩擦焊超细晶组织演变行为与强化机制
项目负责人：崔雷
依托单位：天津大学
研究期限：2018-01-01 至 2020-12-31
资助经费：25.0（万元

项目摘要
中文摘要：
发展核能发电是我国的一项重要能源战略，开发核电关键结构材料高品质焊接技术是促进核能产业安全、高效发展的重要基础。作为先进固相连接技术，搅拌摩擦焊在核电低活化钢焊接方面具有显著优势。但是，搅拌头作用区域超细晶组织的热稳定性和蠕变性能不足对构件可靠性有不利影响，是限制其发展和应用的瓶颈之一。本项目聚焦低活化钢搅拌摩擦焊超细晶组织演变与强化关键基础问题开展研究：采用多模型自适应耦合模拟与实验相结合研究超细晶组织形成机制与演化规律；揭示其高温蠕变变形机制和失效过程、澄清影响蠕变性能的关键因素及作用机制；阐明超细晶组织热稳定化和高温强化机理，提出组织性能优化调控的原理与方法。针对低活化钢搅拌摩擦焊提出超细晶组织演变研究新方法，揭示超细晶组织高温蠕变变形及失效新规律，发展超细晶组织高温性能优化新技术，最终达到高温性能优化、提升的目的。本研究可为发展核电低活化钢高品质搅拌摩擦焊接奠定重要基础。
英文摘要：
Developing nuclear power is an important strategy of China in recent years. High quality welding for key structure materials in nuclear power generation is an important foundation for promoting the development of nuclear industry in safe and high efficiency. As an advanced solid-state joining technology, friction stir welding exhibits several advantages in welding reduced activation steels used in nuclear power plant. However, degradation in thermal stability and creep properties of the ultrafine grain structure can be adverse for the structural reliability, which is restricting its development and application. This project focuses on investigating the key issues for evolution behavior and strengthening mechanism of ultra-fine grain structure on reduced activation steel friction stir welds. Formation mechanism and evolution behavior of ultra-fine grain structure during welding process will be studied with self-adaptive coupled model simulation combined with experiment result. High temperature creep deformation mechanism and failure process will be revealed. Key influence factors and acting mechanism for high temperature creep property will be clarified.The mechanism for thermal stabilization high temperature strengthening of the ultra-fine grain structure will be discussed. And, theories and methods of optimizing microstructures and properties will be proposed. Aiming at friction stir welding of reduced activation steels, for enhancing the microstructure and properties at high temperatures, we will new methods for simulating formation and evolution mechanism of ultra-fine grain in friction stir welding, reveal the new law of creep deformation at high temperatures, and develop new technologies for high temperature properties. This project can be a fundamental for developing high quality friction stir welding of reduced activation steel in nuclear power industry.

                                                                                                                                                                                                       ——来自https://kd.nsfc.gov.cn/