| 摘要 |
PURPOSE:To execute the evaluation by an appropriate non-destructive measurement as an on-line-like evaluation by deriving a plastic strain ratio by propagating directly an ultrasonic wave to a metallic sheet. CONSTITUTION:A rolling direction propagation plate probe 11 sends/receives an ultrasonic plate wave which is propagated by a prescribed distance in the rolling direction of a sample. A rolling 45 deg. direction propagation plate wave probe 12 sends/receives the ultrasonic plate wave which is propagated by a prescribed distance in the direction inclined by 45 deg. against the rolling direction of the sample. A rolling orthogonal direction propagation plate wave probe 13 sends/receives the ultrasonic plate wave which is propagated by a prescribed distance in the direction orthogonal to the rolling direction of the sample. In this state, the quantity for evaluating a main crystal azimuth component of the sample by using a measured value of each propagation time is derived by a computing element 40. As a result, an in-plane mean value and an in-plane azimuth difference of a plastic strain ratio are derived. In such a way, the evaluation by an appropriate non-destructive measurement is executed as an on-line-like evaluation. |
