Investigation of Microstructure and Magnetic Properties of HP40-Nb Reformer Tubes

IF 0.5 4区材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Evaluation Pub Date : 2023-05-01 DOI:10.32548/2023.me-04308

Karim Yosefpour Shirsavar, M. Abbasi, S. J. Hosseinipour

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Abstract

In this paper, the results of nondestructive evaluation, structure characteristics, and magnetic properties of HP-Nb steam reformer tubes of a direct reduction unit are presented. An eddy current testing technique based on a special normal probe was performed to estimate the service life of the outer surface of the reformer tubes at a frequency of 60 kHz. The magnetic properties were investigated by vibrating sample magnetometer testing. Microstructural transformations of reference samples were performed by an optical microscope equipped with image analysis software and scanning electron microscopes. With exposure to severe operational conditions in oxidizing atmospheres and high temperature, microstructural changes such as oxidation and transformation of M23C6 and M7C3 carbide in the carburization zone, and chromium depletion in the austenite matrix, can be intensified. The tubes were inspected on a point basis and the eddy current data were presented as an impedance map. The results of the eddy current testing and vibrating sample magnetometer showed that microstructural changes due to operational conditions affect the electromagnetic response of the tubes.

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HP40-Nb重整管的显微组织和磁性能研究

本文介绍了直接还原装置高压铌蒸汽重整炉管的无损评价结果、结构特点和磁性能。采用基于特殊普通探头的涡流检测技术，在60kHz频率下估算重整器管外表面的使用寿命。通过振动样品磁强计测试对其磁性能进行了研究。通过配备有图像分析软件和扫描电子显微镜的光学显微镜对参考样品进行微观结构转换。在氧化气氛和高温下暴露于恶劣的操作条件下，可以增强微观结构变化，如渗碳区中M23C6和M7C3碳化物的氧化和转变，以及奥氏体基体中的铬损耗。在点的基础上对管道进行检查，涡流数据以阻抗图的形式呈现。涡流测试和振动样品磁强计的结果表明，由于操作条件引起的微观结构变化会影响管道的电磁响应。

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来源期刊

Materials Evaluation 工程技术-材料科学：表征与测试

CiteScore

0.90

自引率

16.70%

发文量

审稿时长

6-12 weeks

期刊介绍： Materials Evaluation publishes articles, news and features intended to increase the NDT practitioner’s knowledge of the science and technology involved in the field, bringing informative articles to the NDT public while highlighting the ongoing efforts of ASNT to fulfill its mission. M.E. is a peer-reviewed journal, relying on technicians and researchers to help grow and educate its members by providing relevant, cutting-edge and exclusive content containing technical details and discussions. The only periodical of its kind, M.E. is circulated to members and nonmember paid subscribers. The magazine is truly international in scope, with readers in over 90 nations. The journal’s history and archive reaches back to the earliest formative days of the Society.

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