首页|Effect of heat treatment temperature on the microstructural evolution of CM247LC superalloy by laser powder bed fusion
Effect of heat treatment temperature on the microstructural evolution of CM247LC superalloy by laser powder bed fusion
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NSTL
Elsevier
? 2022 The Author(s)To attain the desired mechanical properties of an additively manufactured component, robust post-processing in term of thermal treatment is highly required to reduce the crystallographic anisotropy. However, the microstructure appearance with respect to the post-treatment temperature is not well understood mechanistically. In this study, the microstructural evolution of grains of a laser-powder bed fused (L-PBF) nickel-base superalloy, CM247LC, during post-processing heat treatment is investigated systematically. Recrystallization barely happens below the γ' solvus temperature leading to a remaining unhomogenized dendritic(cellular) structure. However, recrystallization is introduced above the γ' solvus temperature. By considering the grain boundary (GB) migration mechanisms and supported by experimental observations, the sluggish recrystallization behavior of this γ'-strengthened nickel-based superalloy has been understood. Owing to lack of the difference in stored energy between adjacent grains, this primary driving force is constrained. The GB migration is majorly driven by capillarity force (1–10 MPa) before the recrystallization occurrence, which is evident by the evolution of GB curvatures. On the other hand, the Zener pinning force generated from GB precipitates including carbides and γ' precipitates provides the dragging force in the comparable scale (1–10 MPa) against the GB migration.
EBSDGrain boundary migrationNeutron pole figureNickel-base superalloyPost-processing treatmentRecrystallization
Xu J.、Peng R.L.、Moverare J.、Brodin H.、Luzin V.
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Division of Engineering Materials Department of Management and Engineering Link?ping University
Siemens Energy AB
Australian Nuclear Science and Technology Organization (ANSTO)
NSTL
Elsevier
