抄録
Specimens were subjected to testing to elongate to required plastic strains, and then subjected to the ultrasonic measurement with immersion and local immersion method. The ultrasonic measurement was carried out by using a probe of 20MHz, in the tensile and transverse directions. Surface wave velocities were obtained by immersion method and local immersion method were almost the same. Velocities in the tensile direction were larger than that in the transverse direction. Velocities changed largely with residual strain. Surface waves were also measured using two probes by immersion method and local immersion method.
