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A Synthetic Study on the New Non-destructive Evaluation by Magnetic Measurements

新型磁测量无损检测综合研究

基本信息

批准号：
10558075
负责人：
TAKAHASHI Seiki
金额：
$ 8.32万
依托单位：
Faculty of Engineering
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10558075/
关键词：
nondestructive evaluation magnetization curve lattice defects (dislocations)SOUID magnetometer A533B steel pressure vessel SUS304 stainless steel Barkhausen noise 原子力圧力容器

项目摘要

The currently employed nondestructive tests for metal fatigue are, useful in the investigation of cracks and fractures in the materials. The cracks are produced by the pile of dislocations, where the dislocation density is maximum locally. Few investigators have conducted nondestructive tests before the appearance of cracks. In the present study, we investigate the nondestructive evaluation of dislocations before the nucleation of cracks takes place.One of the important and urgent areas for the application of nondestructive tests is the nuclear power station, especially the pressure vessel. The deterioration of the pressure vessel determines the life time of the nuclear reactor. Since most pressure vessels are made of A533B steel, in the present study the structure sensitive properties are investigated in connection with the plastic deformation in A433B steel by the round robin tests. The results show that the hysteresis measurement is the best method as NDE of the pressure vessel mate … More rials.The Iwate University group has found two parameters which are sensitive to dislocations. The magnetic susceptibility is measured in the low-field range just above the coercive field H_C and the relation between X_C and H is obtained : X_C = c/H^3. The parameter, c, is sensitive to dislocation density and its distribution. The parameter, c, is licensed (Japanese No. 3158182). The other parameter is H_C/X_H, Which is sensitive in the early stage of plastic deformation.SUS stainless steel is used in the nuclear power station and very important from the viewpoint of NDE.The NDE of SUS 304 stainless steel has been studied for 50 years using the Martensitic transformation. But the magnetic method has not been put to practical use of NDE in the stainless steel. The reason of the difficult practical use has been studied and it is made clear ; The Martensitic phase due to metal fatigue or plastic deformation does not exactly correspond to the lattice defects such as the dislocations and twins. We have concluded that a new parameter, which corresponds to the lattice defects directly, should be found and much data between magnetic properties and lattice defectsshould be accumulated. Less

目前采用的金属疲劳无损检测方法，在研究材料的裂纹和断裂方面是有用的。裂纹是由位错堆产生的，其中位错密度在局部最大。很少有研究者在裂纹出现之前进行无损检测。本文研究了裂纹形核前位错的无损检测，核电站尤其是压力容器是无损检测应用的重要和迫切领域之一。压力容器的劣化决定了核反应堆的寿命。由于大多数压力容器是由A533 B钢制成的，在本研究中，A433 B钢的塑性变形的结构敏感性能进行了研究，通过循环试验。结果表明，滞后测量法是压力容器对接件无损检测的最佳方法 ...更多信息岩手大学的研究小组已经发现了两个对位错敏感的参数。在矫顽场H_C之上的低场范围内测量磁化率，得到X_C与H的关系：X_C = c/H^3。参数c对位错密度及其分布敏感。参数c已获得许可（日本第3158182号）。SUS 304不锈钢是核电站中常用的不锈钢材料，从无损检测的角度来看，SUS 304不锈钢的无损检测已经有50年的历史了。但磁法在不锈钢无损检测中尚未得到实际应用。研究了实际应用困难的原因，明确了由于金属疲劳或塑性变形而产生的马氏体相与位错、孪晶等晶格缺陷并不完全对应。我们认为，应该寻找一个与晶格缺陷直接对应的新参数，积累大量的磁性能与晶格缺陷之间的数据。少