Microstructural Characterization of a Welded Joint Using EMAT and Immersion UT Techniques

Flaw detection is the most common industrial application for UT NDT/NDE testing. Recently, the characterization of different microstructural factors including but not limited to grain size, grain boundary segregation, coarse and fine precipitates, type of microstructure and local chemical segregation is also becoming feasible by the use of these UT techniques. The development of new piezoelectric composite ultrasonic transducers makes possible the detection of microstructural features in engineering materials. In the present study, EMAT (Electro-Magnetic Acoustic Transducers and Immersion UT techniques were used to assess the microstructural changes and soundness of a weld-joint. The NDT/NDE results were supported by microhardness testing and advanced microstructural techniques, scanning electron microscopy and electron-backscattered diffraction (EBSD) analysis.

  1. Silva, Antonio Almeida, and Vera Lúcia Araújo Freitas. "Microstructural Characterization of Carbon Steels Using Ultrasonic Velocity Measurements."20th International Congress of Mechanical Engineering (2009)
  2. Blitz, J. and Simpson, G., Ultrasonic methods of non-dectructive testing (Chapman & Hall) (1996).
  3. Tuncer, B.O, and C.H Gur. “Investigating the Microstructure Ultrasonic Property Relationships in Steels." Middle East Technical Univ. Web. 1 Dec. 2014.
  4. Edwards R. S., S. Dixon and X. Jian, “Non-Contact Ultrasonic Characterization of Defects Using EMATs” , S.B., J. Phys. D: Appl. Phys. 35, 816-824 (2002).
  5. Sahoo S., B. B. Jha* and T. K. Sahoo. “Microstructural Characterisation of Thermally Degraded 2.25Cr–1Mo Steel Using Ultrasonic Measurement and its Correlation With Mechanical Properties” Material Science and Technology Vol 30 No 10 (2014).
  6. Gopichand A., M. Muralidhara Rao, A. V. N. L. Sharma and V. S.Tony: “Analysis and Estimation of Attenuation Coefficient of Agingen-19 Steel”, J Eng. Res. Appl., 2012, (1), 590–595.7.
  7. V. Murav’ev: “Interrelationship of the velocity of an ultrasonicwave in steels and their heat cycles”, Soviet J. Nondestr. Test., 1989,25, (2), 135–37.13.
  8. Xian J., Steven Dixon, Rachel S. Edwards, “Ultrasonic Generation and Optimization For EMAT” J Phys, D: Appl Phys (2004).
  9. Hirao M. and H. Ogi, EMATs for cience and Industry: Noncontacting Ultrasonic Measurements. Kluwer Academic Publishers, (2003).
  10. Aurora A. Zinck, Sridhar Krishnaswamy, “Material Microstructure and Ultrasonic Nonlinearity´Joint UFFC, EFTF and PFM Symposium (2013)
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