Ultrasonic Inspection Test Of Zirconium 702 Sheet

The zirconium 702 sheet has a close-packed hexagonal crystal structure below 865 °C. During the zirconium transformation, Widmanrite will be formed when β-α is cooled. The weld of the zirconium 702 plate has a relatively coarse β-transformation structure. In the heat-affected zone, since the welding temperature has exceeded the transformation temperature, there are also coarse grains. The β-phase structure after the transformation has higher strength and lower strength than the fine-grained α-structure of the forged and annealed materials. toughness.

Ultrasonic inspection is most concerned with acoustic characteristics parameters such as sound speed and sound attenuation of materials. According to relevant information, the longitudinal wave sound velocities of zirconium are CzrL=4650 m/s, 4620 m/s, and 4310 m/s respectively; the transverse wave sound velocities are: CzrS=2250 m/s, 2340 m/s respectively, but it is not given. Corresponding and accurate zirconium material (grade). However, there is basically no description of the attenuation of ultrasonic waves in zirconium materials.

Through the test results related to the zirconium 702 sheet, it can be concluded that the longitudinal and shear wave velocities in the zirconium 702 plate (the longitudinal wave sound velocity 4800 m/s (plate) are used in the measurement of other different thicknesses of the zirconium 702 material, and it has been proved that the error is within 0.1 mm order of magnitude. Due to the poor uniformity of the deposited metal in the weld, it can also be calculated that the speed of sound when the shear waves pass through this area is 2293 m/s.); the longitudinal and shear wave velocities in the deposited metal, and it is confirmed that the welded joints of this material can be inspected by ultrasonic; the signal-to-noise ratio observed in the test is large, which does not affect the inspection at all, and the signal-to-noise ratio of the corresponding carbon steel no big difference. This test provides colleagues with the sound velocity of zirconium 702 material, which can be used in thickness measurement and ultrasonic inspection and can also be used for reference in related tests.