Angle beam method for detection of textural features in steel sheets

Duijster, Arno; TNO; Netherlands

Duijster, A.; TNO; Netherlands
Volker, A.; TNO; Netherlands
Stolzenberg, M.; Salzgitter Mannesmann Forschung GmbH; Germany

ID: ECNDT-0300-2018
Download: PDF
Session: Materials Characterization UT
Room: G1
Date: 2018-06-13
Time: 16:00 - 16:20

Texture is an important characteristic of sheet metal for forming complicated shapes accurately and reproducibly in one production step. Typical applications are automotive components. Moreover, texture is an important property for electro-steel. Currently texture is measured from samples taken from production material and analysed by XRD and/or EBSD. The existing methods do give a very complete image of the texture but are time consuming and hence expensive and lead to the loss of the produced material. This paper presents a new method using ultrasonic wedge transducers for inline texture analysis. Characteristic features are observed by Fourier transform the first ultrasonic signal that is recorded in transmission. The origin of the observed shoulders in the frequency spectrum is explained by numerical simulation. Moreover, the simulations demonstrate the sensitivity to textural features. Application of the method is demonstrated on several samples of the different steel types used in the Product Uniformity Control (PUC) project. The different textures in the samples express themselves in the location and the relative amplitude of the characteristic shoulders pattern in the frequency domain. A major advantage of the method is that it is very quick and can be applied inline.