抄録
The relationship between the chemical composition of steel materials and the fireball has been examined by using SEM photographing of fireball. As a result of the experiment, the kind of steel material could be estimated from fireball's image of SEM. The following contents would be pointed out as results. Increasing contained carbon, the size of fireball becomes large. And also the size of fireball of alloy steels increases to approximately twice that of the carbon steel. When nickel composition is contained in the material, the surface of fireball shows the delamination. When the many chromium components are contained the size of fireball becomes large, and many holes occur in the surface of firebal. The presence of molybdenum in the steel shows the smooth texture at the surface of the fireball. The wrinkles appear in the surface of the fireball by the presence of tungsten component, and many holes occur in the surface of the fireball. Whether the material is ductile or brittle, we would be estimated pattern of deformation of the hole of the fireball.
