Non-destuctive Evaluation of Power-Generation Steel Microstructure Changes Using Electromagnetic Sensors

Liu, J and Zhou, L and Hao, X J and Strangwood, M and Peyton, A and Morris, P F and Davis, C L (2011) Non-destuctive Evaluation of Power-Generation Steel Microstructure Changes Using Electromagnetic Sensors. In: Proceedings of the International Conference on Non Destructive Evaluation for Steel and Allied Industries NDESAI - 2011, Dec. 2-3, 2011, SNTI Auditorium Jamshedpur, India.



This paper presents results from a multi-frequency electromagnetic (EM) sensor used to characterise the microstructural changes in P9 and T22 power generation steels after tempering and elevated temperature service exposure. The EM sensor can detect the microstructural changes in both steels due to the corresponding relative permeability values increasing from 33 to 67 and then 133 for P9 during the tempering and the long service exposure respectively while for T22 the permeability changes from 61 to 75 and then 86, as well as the relatively small per-centages of resistivity change. The changes in the rel-ative permeability values have been qualitatively corre-lated to the changes in microstructural features, which affect the domain wall movements during the multi- freq-uency EM sensor tests. The real inductance value at low frequencies Lo is particularly affected by differences in the relative permeability of the steels studied, which is found to increase exponentially with the Lo values in the range studied.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:
Uncontrolled Keywords:Steel microstructure; Electromagnetic Sensors; microstructural changes
Divisions:Material Science and Technology
ID Code:4624
Deposited By:Sahu A K
Deposited On:17 Jan 2012 16:58
Last Modified:17 Jan 2012 16:58
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