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NDT.net Issue - 2018-04 - Articles
NDT.net Issue: 2018-04
Publication: NDE 2017 Conference & Exhibition of the society for NDT (ISNT), 14-16 December 2017, Chennai, T.N., India (NDE-India 2017)
ARTICLE

A Comparative Study of PAUT and TOFD responses with the change in microstructures of the materials – A Step towards reliable detection.

Dharmveer Singh5, Abhishek Banerjee2, Sumit Das
GE Power India Limited3, Durgapur, India

Abstract: The ever-changing market and evolving power sector poses a constant need for cost reduction and reducing atmospheric emissions. This has led to a worldwide impetus to improve the power plant efficiency thereby reducing emissions and improving cost effectiveness. This necessitate the requirement for materials with improved elevated temperature and high strength properties. These new and critical materials need the reliable NDE techniques which can provide more accurate flaw detection. Among all non-destructive examination methods, Advanced Ultrasonic examinations (PAUT and TOFD) are some of the most reliable volumetric examinations along with conventional Ultrasonic Examination for the most used and advance materials. The change in microstructures of the materials affect acoustic properties of the material, resulting in change of attenuation, scattering, SNR etc. Heat treatment and mechanical work (cold or hot) modifies the microstructure of the material. This provides a correlation between heat treatment, mechanical work and responses from ultrasonic examination Ultrasonic testing suffers from some inherent drawbacks which can be correlated with the microstructure of the materials. Microstructural variations can cause varied ultrasonic response because of changes in attenuation, velocity, scattering, SNR. Further, it is well known that prior heat treatment and mechanical working also plays a

Keywords: UT (Ultrasonic Testing), PAUT (Phased Array Ultrasonic Testing), NDT (Non-Destructive Testing) (2), SNR (Signal to Noise Ratio),
*Keywords are freely formed keywords from the authors and thus you may Search also for similar terms.

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