A New Composite-Sample Method for Orientation-Distribution Analysis

A new composite-sample method is suggested for crystallite orientation distribution analysis. Theproposed method entails preparation of composites such that the surface to be examined isperpendicular to the rolling direction. The suggested reference frame is (—ND, TD, RD) for Roe'smethod. This choice simplifies expression of the results with respect to the conventional (RD, TD,ND) frame. A novel technique employing laser welding on three surfaces is used to bond adjacentsheet layers. The proposed composite-sample can be more easily and accurately constructed. Itrequires only about 12 percent of the material needed for Lopata and Kula's method. Existingprograms for incomplete pole-figures have been modified to permit application of the new method.The method is expected to be statistically advantageous where materials develop “pancake”- oracicular-shaped grains. The method is illustrated for a deep-drawing aluminum-killed sheet steel, andresults are compared with those obtained with a conventional sheet-sample.