Abstract
Stainless steel is widely used on the power station boiler and main steam piping, whose service temperature is generally between 300 and 650°C. Electromagnetic acoustic transducer is one of the most promising ultrasonic technologies to achieve the in-service non-destructive testing of the material and structure at high temperature. As the physical properties of the material change with temperature, ultrasonic testing signal also varies. The variations of the electromagnetic ultrasonic speed, signal amplitude and wave package shape with temperature were studied. The stainless steel of 304, 316, TP347H and aluminium were observed in the experiments. The results showed that the amplitudes and velocities of 304 and 316 stainless steel decreased monotonously as a function of temperature, while TP347H showed the opposite trend. The results imply that shear wave detection with electromagnetic acoustic transducer could be used efficiently below 500°C for the application of non-destructive testing at high temperature.
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