The surface texture of the cutter blade before and after cutting is very distinctive(Figs. 6 and 7). The direction of plastic deformation is parallel to the movement direction of the cutter blade, whilst the direction of the machining texture is perpendicular to the cutting edge. Fig. 7 shows that after a of wear test, the machining texture totally The direction of the plastic deformation indicates that the sand particles roll along the cutter blade with the smallest resistance. This type of abrasive particle wear was caused not only by the sand particles, but also by the sand embedded inside the grass. In order to establish whether the grass contains silicon particles, the grass sample was examined by SEM. It was found that grass did contain sand particles(Fig. 9). The sand particles scattered around the grass causes the abrasion effect. The abrasive particle wear occurs not only at the material surface but also at the sub-surface. From Figs. 6 and 7, cracks start and grow firstly in the sub- surface and then extend to the surface. This is similar to the metal fracture mechanism, i.e., plastic deformation causes dislocations to form a crack nucleus and then propagates to form a cavity. As shown in Fig. 7, it can been seen that a crack exists at the sub-surface, the source of the crack. Figs 8 and 9 indicate that there exists another type of surface wear. There are two possible mechanisms of formation. One is the formation of abrasive particle contours due to micro-machining action. The other is caused by making the plug- ging effective, i.e., the formation of two projections caused by the squeezing action of material plastic deformation. The appearance of this type of wear looks like processing marks. To indicate the difference, the distribution of the process flow mark is non-uniform and shallower. Apart from the abrasive particle wear, carbide inside the iron content under a certain set of conditions also produces abrasive particle wear(see Fig. 10).