应力腐蚀裂纹局域电导率分布特征与人工调控方法

项目名称： 应力腐蚀裂纹局域电导率分布特征与人工调控方法

项目编号： No.51277139

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 电工技术

项目作者： 陈振茂

作者单位： 西安交通大学

项目金额： 80万元

中文摘要： 应力腐蚀裂纹（SCC）是一些金属材料即使在低应力和弱腐蚀环境下也时有发生的开裂破坏现象，严重威胁核电站容器、管道等关键结构的安全，需对其进行涡流检测等定量无损评价。裂纹区域电导率分布极大影响SCC涡流定量检测精度，也是制备检测认证试验用人工SCC试件的基础。为究明SCC局域导电率分布特征，建立可人工调控裂纹区域电导率的SCC制备方法，本项目拟开展研究包括：1）建立基于亚微米四端子电位测量的局域电导率测定方法，分层/片测量典型SCC电导率并揭示其三维分布特征；2）研究焊接面形态与热等静压（HIP）焊接面导电率分布的相关性，建立焊接面电导率人工调控方法；3）结合SCC导电率分布规律和HIP焊接界面裂纹导电率调控技术，确立SCC人工模拟试件制备方法，并通过检测实验和信号反演验证其有效性；4）研究疲劳裂纹闭口加载方法及参数对裂纹区域导电率分布的影响，探讨负载闭口疲劳裂纹模拟SCC的可行性。

中文关键词： 应力腐蚀裂纹；涡流检测；局域导电率分布；模拟裂纹；制备方法

英文摘要： Stress Corrosion Cracking (SCC) is a failure mechanism of some structural steel that may occurs under low tensile stress and weak corrosion environment. SCC may cause serious safety problem for key structural components in nuclear power plant, and consequently need to be detected timely during service. The local conductivity distribution in crack zone affects the sizing precision of quantitative Eddy Current Testing (ECT) for SCC NonDestrutive Evaluation (NDE), and also is a key for the fabrication of simulated SCC testpieces. In order to clarify the features of the local conductivity distribution of typical SCCs and to establish a fabrication strategy to make artificial SCC of controllable crack conductivity, the following studies will be throughly conducted in this project: 1) Development of a submicron local conductivity measurement methodology for investigating 3 dimensional local conductivity distribution in crack region of typical SCC testpieces. 2) Correlation investigation of the welding surface status and the local conductivity distribution of the surface crack fabricated with the Heat Isotropic Pressure (HIP) welding technique. 3) Establishment of fabrication method for making artificial SCC based on the crack conductivity distribution and its controlling technique, and its feasibility evaluation with

英文关键词： Stress Corrosion Crack；Eddy Current Testing；Local Conductivity Distribution；Imitative Crack；Fabrication Method