Relationship between fireball's shapes and mechanical materials under grinding

Abstract

The relationship between the elements included in materials and the fire ball obtained by spark test, that is simple, has been examined by using SEM photographing of the fire ball. From experimental results, the kind of steel material could be estimated from fireball's image of SEM. The following contents would be pointed out as the results. The size of fire ball becomes large with the increase in the contained carbon. The size of alloy steels becomes about the double of fire ball of carbon steel. When nickel element is contained in a material, the surface of fire ball shows the delamination. When the many chromium components are contained the size of fire ball becomes large, and many holes occur in the fireball. The presence of molybdenum element in the steel shows the smooth texture at the surface of the fireball. The wrinkles appear at the surface of the fireball by the presence of tungsten element, and the many holes occur in the fireball. Whether the material is ductile or brittle we would be estimated from the pattern of deformation of the hole of the fire ball. The kind of material would be able to distinguish from the qualitative properties of the fire ball.