Study on the Change Law of Transverse Ultrasonic Velocity in a High Temperature Material

IF 1 4区材料科学 Q3 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Research in Nondestructive Evaluation Pub Date : 2020-08-20 DOI:10.1080/09349847.2020.1807077

Yang Zheng, Zheng-wang Li, Jinjie Zhou, Zong-yang Zhang

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引用次数: 3

Abstract

ABSTRACT The propagation velocity of a transverse ultrasonic wave is influenced by the temperature of the testing materials. In other words, it directly affects the accuracy of thickness measurement and flaw detection as well as the validity of the focal law during the high-temperature ultrasonic inspection. For the above reasons, an electromagnetic acoustic transducer (EMAT) was adopted in this study to measure the transverse ultrasonic velocities of several metallic specimens when heated to the temperatures of the order of 700°C. EMAT was particularly favored for use in this study owing to its non-contact and couplant-free characteristics. The reliability of the collected data and experimental stability were verified via the establishment of a high-temperature experimental system as well as analysis of the measurement error and uncertainty. By comparing ferromagnetic and non-ferromagnetic materials using this system, it can be found that the transverse ultrasonic velocity of ferromagnetic materials decreases in a nonlinear “step-like” manner with the temperature. Therefore, results obtained from this study indicates that the velocity–temperature relationship of different materials does not follow the same law. Besides, the curves tested in this study can serve as a ready references to facilitate nondestructive inspections of materials at high temperatures.

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高温材料中横向超声速度变化规律的研究

横向超声波的传播速度受测试材料温度的影响。也就是说，在高温超声检测中，它直接影响到测厚和探伤的精度以及焦点规律的有效性。基于以上原因，本研究采用电磁声换能器(EMAT)测量几种金属试样在加热至700℃数量级时的横向超声速度。EMAT由于其非接触和无偶联剂的特性，在本研究中特别受欢迎。通过建立高温实验系统以及对测量误差和不确定度的分析，验证了所采集数据的可靠性和实验的稳定性。利用该系统对铁磁性材料和非铁磁性材料进行比较，发现铁磁性材料的横向超声速度随温度呈非线性“阶梯”状下降。因此，本研究的结果表明，不同材料的速度-温度关系并不遵循相同的规律。此外，本研究所测曲线可作为材料高温无损检测的现成参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Research in Nondestructive Evaluation 工程技术-材料科学：表征与测试

CiteScore

2.30

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Research in Nondestructive Evaluation® is the archival research journal of the American Society for Nondestructive Testing, Inc. RNDE® contains the results of original research in all areas of nondestructive evaluation (NDE). The journal covers experimental and theoretical investigations dealing with the scientific and engineering bases of NDE, its measurement and methodology, and a wide range of applications to materials and structures that relate to the entire life cycle, from manufacture to use and retirement. Illustrative topics include advances in the underlying science of acoustic, thermal, electrical, magnetic, optical and ionizing radiation techniques and their applications to NDE problems. These problems include the nondestructive characterization of a wide variety of material properties and their degradation in service, nonintrusive sensors for monitoring manufacturing and materials processes, new techniques and combinations of techniques for detecting and characterizing hidden discontinuities and distributed damage in materials, standardization concepts and quantitative approaches for advanced NDE techniques, and long-term continuous monitoring of structures and assemblies. Of particular interest is research which elucidates how to evaluate the effects of imperfect material condition, as quantified by nondestructive measurement, on the functional performance.