Effect of Ta on solidification characteristics and mechanical properties of DZ411 Ni-based superalloy

The effects of Ta content (2.72wt.%, 3.10wt.% and 4.00wt.%) on the solidification characteristics mechanical properties directionally solidified DZ411 Ni-based superalloys were investigated. It is found that Mo decreases with increase in liquid phase after directional solidification, indicating addition can reduce element segregation alloys. primary secondary dendrite arm spacings (PDAS SDAS) alloy Ta, which are consistent models by Hunt Wagner. PDAS SDAS provide enough space for growth tertiary arms, hinders unfavorably oriented dendrites. As a result, facilitates favorably More MC carbides γ–γ’ eutectics formed interdendritic regions, attributed to phase. Furthermore, degree supersaturation W, γ matrix increases thus, promotes formation TCP also microhardness both regions alloy, closer Ta.