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Assessment of microstructural changes in Grade 91 power station tubes through incremental permeability and magnetic Barkhausen noise measurements

Wilson, John and Liu, Jun and Karimian, Noushin and Davis, Claire and Peyton, Anthony (2014) Assessment of microstructural changes in Grade 91 power station tubes through incremental permeability and magnetic Barkhausen noise measurements. In: 11th European Conference on Non-Destructive Testing (ECNDT 2014), 06 October 2014 - 11 October 2014, Prague, Czech Republic.

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Abstract

The use of Grade 91 steel for high-temperature power plant applications can result in substantial reductions in component thickness compared to weaker alloys, resulting in reduced thermal stresses and improved service life. Although Grade 91 offers superior resistance to thermal fatigue and creep to other grades used in the industry, this is dependent on the creation and maintenance of a specific microstructure, which can be altered through routine component fabrication, installation and maintenance. Electromagnetic inspection has the potential to assess the level of degradation in steel components through in-situ measurements. In this work, correlations are drawn between microstructural changes in heat treated Grade 91 samples and electromagnetic properties including incremental and differential permeability and Barkhausen noise. These correlations are first established by examining machined samples using a closed magnetic loop, lab-based system, and then transferred to open magnetic loop measurement of tube samples. The results demonstrate the potential viability of electromagnetic methods for inspection of power station tubes in-situ.

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