超急冷凝固させた薄帯鋳鉄のキャラクタリゼーションについて

抄録

  Ribbon samples of Fe-C, Fe-C-Si and Fe-C-P system alloys were prepared by a single roller apparatus for rapidly quenching a metal from the liquid state (splat cooling). Characterization of the ribbon samples was performed by observation of the structure, X-ray diffraction and state analysis of surface. (1) When silicon or phsphorus is added into Fe-C system alloy, the ribon samples have metallic gloss, toughness and continuity. (2) When splat cooling is done in this method, the ribbon samples of Fe-C system is crystalline. Some Nonequilibrium phase (ε phase) appears when Si is contained and amorphous phase is formed when P is contained. (3) A region of high carbon concentration partially exists on the surface of the splat cooled cast iron ribbons and the region contains carbon of different degree of graphitization. This phenomenon is considered to result from exuding of the carbonmicrogroups, assumed to exists in the melts because of the liquid structure of Fe-C system alloy, on the surface of the ribbon.