Ultrasonic testing of the fracture toughness of Zr-Nb pressure tubes

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Proceedings titleProceedings of the 1996 ASME PVP and ICT Pressure Vessels and Piping Conference
Conference1996 ASME PVP and ICT Pressure Vessels and Piping Conference, July 21-26 1996, Montreal, Canada
AbstractBulk elastic properties were measured, using ultrasound, in thickness and circumferential directions of 13 Zr-Nb pressure tubes samples from CANDU nuclear reactors in the hope of finding a nondestructive means to evaluate fracture toughness. The longitudinal wave velocity in the thickness direction are found especially sensitive to changes in the α-Zr single-crystal c axis orientation distribution. This is verified by comparing measured values to predictions based on neutron diffraction measurements of the crystallographic orientation distribution and on the single-crystal elastic constants of α-Zr. Moreover, those velocities most sensitive to texture correlate best with the crack growth toughness of the pressure tubes. This led to the discovery of a correlation between the degree of alignment of the crystallographic c axes along the tube circumferential direction and crack growth toughness. The better is the alignment, the lower is crack growth toughness. Because of the measurement simplicity, the ultrasonic technique could be developed into a rugged industrial sensor.
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AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NPARC number21273317
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Record identifier15c38f31-6238-4451-92ba-c6bb555ce8d8
Record created2015-01-07
Record modified2016-05-09
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