Sachio Oki

Sintering Processes in Iron-Molybdenum-Carbon Powder Mixture Compacts

Alloying processes of molybdenum in sintered steels were studied on the basis of iron-molybdenumcarbon phase diagram. Mixed powder compacts of iron-molybdenum-carbon system containing molybdenum carbide (Mo2C), metallic molybdenum, or ferro-molybdenum powder as a molybdenum additive were sintered in vacuum between 1273K and 1523K for 3.6ks, and the phases formed in these specimens were identified by means of X-ray diffractometory.The results suggest that molybdenum diffuses into iron through a liquid phase produced by (γ-Fe)-Fe3C-Fe2MOC eutectic reaction and/or the M6C carbide formation. In the compacts containing molybdenum carbide powder, the diffusion of molybdenum tended to occur through the liquid phase, whereas in the compacts containing metallic molybdenum and Ferro-molybdenum powders it arose due to the formation of the M6C carbide. The degree of the molybdenum diffusion in iron-molybdenum-carbon compacts changed dependeng on the diffusion path.