Numerical Simulation of Molybdenum and Nickel Distribution in Large-Scale Slab Ingots of Ti-0.3 wt.% Mo-0.8 wt.% Ni Alloys During Electron Beam Cold Hearth Melting.

A multi-physics model has been developed to investigate the molybdenum and nickel distribution in large-scale Ti-0.3 wt.% Mo-0.8 wt.% Ni slab ingots obtained by electron beam cold hearth melting. Numerical methods are pivotal in revealing the distribution trends of molybdenum and nickel in slab ingot in different casting conditions. The distribution of molybdenum slightly changed between 0.28 and 0.32 wt.% in the solidified ingot. However, the sharp change in the nickel distribution (between 0.73 and 1.53 wt.%) was caused by the fluid velocity decrease along the flow direction, resulting from a weakened vortexing effect. Additionally, the increase of the casting speed or pouring temperature led to a deeper molten pool and evident vortexing effect. A potential relationship indicates the decrease of nickel segregation degree at higher pouring temperatures, or the casting speed decrease within the research scope. [ABSTRACT FROM AUTHOR]