Measurement technique of material properties of plate steel using laser-based ultrasonics (Part 1: Measurement of austenite grain size)

摘要

The ultrasonic attenuation coefficients of high temperature specimens were measured by laser-based ultrasonic technology. According to the experimental results, the ultrasonic attenuation coefficients have better relationship with average AGS with higher ultrasonic frequencies than 5 MHz. The experimentally obtained relationships between ultrasonic attenuation coefficient and AGS would be used as a calibration curve to evaluate the AGS in the case of on-line measurement system.