Fig. (12) Average texture aspect ratio (S_tr) for the FB, CB, CB+HF and TS surfaces. Randomness is obtained for the FB surface over the whole SEM range while texture can be seen for the CB and CB+HF surfaces at the highest magnification (lowest filter sizes). The turned surface is classified as textured surface at the higher filter sizes and goes towards a random structure at the lower filter sizes. ♦ = CB, ■ = CB+HF, × = FB, ▲ = TS.