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Creep Damage Analysis and Remaining Life Assessment of Ferromagnetic Materials Exposed to High Temperatures

高温下铁磁材料的蠕变损伤分析和剩余寿命评估

基本信息

批准号：
0434516
负责人：
J. Indacochea
金额：
$ 20万
依托单位：
University of Illinois at Chicago
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2004
资助国家：
美国
起止时间：
2004-07-01 至 2007-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0434516&HistoricalAwards=false
关键词：
Creep Damage Analysis Remaining Life

项目摘要

ABSTRACT0434516 J. IndacocheaUniv. Illinois, ChicagoThis study intends to establish a viable method to measure creep damage of low alloy ferromagnetic steels used at elevated temperatures, by using a magnetoelastic sensor developed at UIC. A basic relationship between magnetoelastic phenomena and structural changes within the ferromagnetic materials will be developed to assess creep. By understanding the role of microstructure changes on the material's magnetic response, adjustments to the sensor design can be made to enhance its sensitivity. Creep testing is performed on several samples pertaining to two types of ferromagnetic steels; systematically the corresponding magnetic responses of each sample will be measured using the sensor. A calibration curve of "creep-magnetic response" will be produced to evaluate the progressive magnetic behavior of the ferromagnetic steels in relation to creep damage. The metallurgical changes of the ferromagnetic materials are characterized by light, scanning, and transmission electron microscopy with EDS, x-ray diffraction and microhardness measurements. Issues surrounding domestic energy supply and protection against infrastructure disturbances demand a closer evaluation and real time system monitoring of materials to ensure reliability. A practical method to measure creep damage of low alloy ferromagnetic steels is expected to result. Development of NDE devices to evaluate the materials status is key to extending the service life of energy producing systems.

浙江大学学报（自然科学版）。本研究旨在建立一种可行的方法，通过使用UIC开发的磁弹性传感器来测量高温下使用的低合金铁磁性钢的蠕变损伤。磁弹性现象和铁磁性材料结构变化之间的基本关系将被发展以评估蠕变。通过了解微结构变化对材料磁响应的作用，可以对传感器设计进行调整，以提高其灵敏度。蠕变试验在两种类型的铁磁性钢的几个样品上进行；利用传感器系统地测量每个样品的相应磁响应。生成“蠕变-磁响应”的校准曲线，以评估铁磁性钢在蠕变损伤中的渐进磁性行为。采用光镜、扫描电镜、透射电镜、能谱仪、x射线衍射仪和显微硬度仪对铁磁材料的金相变化进行了表征。围绕国内能源供应和防止基础设施干扰的问题要求对材料进行更密切的评估和实时系统监测，以确保可靠性。期望得到一种实用的测量低合金铁磁钢蠕变损伤的方法。开发无损检测装置来评估材料状态是延长能源生产系统使用寿命的关键。