LIQUID SOLID EQUILIBRIUM AND SEGREGATION BEHAVIOR OF NI-FE-MO-CR ALLOYS/

The liquidus and the solidus surfaces in the Ni - Fe - Mo - Cr system were determined as well as the ternary eutectic composition in the sys tem Ni - Fe - Mo (40.5 wt.% Ni + 46.5 wt.% Mo + 13 wt.% Fe), the eutec tic temperature (1312 degrees C) and the eutectic reaction, L --> gamm a + P + sigma). Isothermal treatments between T-L and T-S directional solidification experiments lead to the distribution coefficients at eq uilibrium and the diffusion coefficients for each element in the melt ahead of the plane solidification front. It was found that the melt is diluted with Ni and Fe, enriched with Mo, and Cr is evenly distribute d in the liquid and solid.