Effects of a High Magnetic Field on the Microstructure of Ni-Based Single-Crystal Superalloys During Directional Solidification

Improvement in creep life of a nickel-based single-crystal superalloy via composition homogeneity on the multiscales by magnetic-field-assisted directional solidification

“…7 in Supplementary ), but the one on ΔT 0 and R has not reported up to now to our knowledge, which need further investigation. However, λ 1 shows an increase when MHD effect dominates the melt convection 36 , 37 , which is consistent with the present results and the above discussion.…”

“…From the above statement, each effect of magnetic fields plays the different role in the various alloy during the different solidification conditions. In our previous study, the destroying effects of TEMF on the SC integrity in nickel-based superalloy was investigated 35 , the TEMC and MHD effects on the primary dendrite-arm spacing 36 , 37 and precipitation phases 37 , 38 under the different parameters of solidification and magnetic fields. The present paper aims to develop and optimize the combination of the MHD, TEMC, and TEMF effects in the directional solidification of SC Nickel-based superalloys.…”

Processing of directionally cast nickel-base superalloys: solidification and heat treatments

“…Using electron beam, advantages include an even finer microstructure due to always higher temperature gradients, more homogeneous chemical composition and reduced shrinkage porosity compared to investment casting, while recrystallization is an issue if heat treatment is still to be considered. Magnetic field is another direction being investigated for improvement of the superalloy microstructure [23]. These researches can be considered as new directions for potential breakdown technologies.…”

Tailoring Microstructure and Microsegregation in a Directionally Solidified Ni-Based SX Superalloy by a Weak Transverse Static Magnetic Field

“…The relationship between segregation coefficient and WTSMF can be also explained by the TEMC effect. During solidification, the enhanced melt flow generated by the TEMC effect contributes to the transfer of the alloying elements [37]. Meanwhile, the fine dendrite is also helpful to reduce microsegregation because it shortens the distance of diffusion and decreases the accumulation of the alloying elements.…”

“…Therefore, the increased undercooling promotes the nucleation of the γ′ phase. When a WTSMF is applied during DS, TEMC leads to an increase in the cooling rate, which then raises the undercooling of the γ′ phase and promotes its nucleation [37]. Furthermore, the refined PDAS under a WTSMF reduces the growth time of the γ′ phase.…”