Nondestructive analysis of the deep-drawing behavior of rolling sheets with ultrasonic techniques

Textures in rolled sheets are developed during production by deformation processes and heat treatments. Thus magnetic, elastic and plastic properties of the product become directionally dependent. This can be desirable, but it can also have negative effects. In both cases a nondestructive analysis of the texture and its consequences for materials behavior is of great interest. X-ray diffraction techniques are developed and used in industry for that purpose. Complementary to these methods, ultrasonic techniques are developed in order to analyse the texture in the surface as well as in the bulk of rolled sheets and to determine their deep drawing behaviour. Both, ultrasonic and X-ray evaluate the elastic anisotropy caused by texture and use theoretical and empirical relations between texture and plastic behavior. In an extensive study, the texture influence on different ultrasonic wave velocities is measured in serieses of cold and hot rolled ferritic sheets. Based on that, ultrasonic te chniques for the surface and bulk analysis are developed and used for the evaluation of the expansion coefficients of the orientation distribution function and for the determination of the deep drawing behavior of the sheets under test. The results are compared with those found by X-ray techniques and mechanical tests