Magnetic sensing for microstructural assessment of power station steels: Differential permeability and magnetic hysteresis

7th Sensors & their Applications

Karimian, N.^1 ; Wilson, J.W.^1 ; Yin, W.^1 ; Liu, J.^2 ; Davis, C.L.^2 ; Peyton, A.J.^1

School of Electrical and Electronic Engineering, University of Manchester, M60 1QD, United Kingdom^1

School of Metallurgy and Materials, University of Birmingham, B15 2TT Edgbaston, United Kingdom^2

关键词: Differential permeability;    Electromagnetic inspection;    Elevated temperature;    Impedance measurement;    In-situ techniques;    Microstructural assessments;    Microstructural conditions;    Microstructure changes;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/450/1/012042/pdf
DOI  :  10.1088/1742-6596/450/1/012042

来源: IOP

【 摘 要 】

Failure of power station steel components can have severe economic impacts and also present significant risks to life and the environment. Currently components are inspected during costly shut-downs as no in-situ technique exists to monitor changes in microstructure of in-service steel components. Electromagnetic inspection has the potential to provide information on microstructure changes in power station steels in-situ. In this paper, tests have been carried out on pipe and tube samples in different microstructural conditions, using a lab-based closed magnetic circuit and impedance measurement systems. EM properties have been identified with correlations to material properties, which can quantify degradation in-situ and at elevated temperatures.