Method for determining the swelling of the grain of the metallic structure of a steel piece and apparatus for using this method.

摘要

Method for detecting the swelling of the grain of the metallic structure of a steel piece, by the emission of an ultrasonic wave at one point of the piece, and reception and measurement of the intensity of the weakened transmitted wave at another point of the piece. The wave is emitted and received in a direction lying between 35 DEG and 45 DEG relative to the normal to the surface of the piece. <IMAGE>