They include a cementite, two cementite, three cementite, eutectic cementite and eutectoid cementite, and compare their temperature, composition and morphology
Three: cementite in iron graphite in the phase diagram of F (Fe) + Fe3C two-phase region precipitation of Fe3C is three times the cementite formation temperature in the eutectoid temperature (727 DEG C), morphology is fine flake or granular.Eutectic cementite: Fe3C body in eutectic (A (Fe) + Fe3C) formed at eutectic temperature (1148 DEG C). The morphology is lamellar eutectic morphology. The carbon content is about 4.3%.Eutectoid cementite: Fe3C in eutectoid (F (Fe) +Fe3C) formed at eutectoid temperature (727 DEG C), characterized by flaky eutectoid morphology. The carbon content is about 0.77%.
Two: cementite in iron graphite phase, carbon content more than 0.77%, in A (Fe + Fe3C) two-phase region precipitation of Fe3C is two times the cementite formation temperature in the eutectic temperature (1148 DEG C) and eutectoid temperature (727 DEG C), morphology of the mesh is a typical carbon content. From 0.77% to 6.69% is the typical composition range.
A: cementite in iron graphite phase, carbon content more than 4.3%, in L (Fe + Fe3C) two-phase region crystallization of Fe3C as a primary cementite formation temperature in the eutectic temperature (1148 DEG C) above, morphology in large sheets (during eutectic organization). Carbon content from 4.3% to 6.69% is the typical composition range.
