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

ABSTRACT: The improvement of the creep properties of single-crystal superalloys is always strongly motivated by the vast growing demand from the aviation, aerospace, and gas engine. In this study, a static magnetic-field-assisted solidification process significantly improves the creep life of single-crystal superalloys. The mechanism originates from an increase in the composition homogeneity on the multiscales, which further decreases the lattice misfit of γ/γ' phases and affects the phase precipitation. The phase-precipitation change is reflected as the decrease in the γ' size and the contents of carbides and γ/γ' eutectic, which can be further verified by the variation of the cracks number and raft thickness near the fracture surface. The variation of element partition decreases the dislocation qu

SUBMITTER: Ren W 

PROVIDER: S-EPMC5780385 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature