Journal Article

PUBDB-2025-04870

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Balancing strength and ductility in MP159 superalloy (Co–Ni–Cr–Fe–Mo–Ti–Al–Nb) through severe plastic deformation and multistage heat treatments

Jeong, H.-T. ; Han, S.Extern* ; Ryu, C. W. (Corresponding author)Extern* ; Kim, W. J. (Corresponding author)

2025
Elsevier Lausanne

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Please use a persistent id in citations: doi:10.1016/j.jallcom.2025.184852

Abstract: This study investigated the enhancement of room-temperature mechanical properties in the Co-Ni-Cr-Fe-Mo-Ti-Nb-Al MP159 superalloy through severe plastic deformation via high-ratio differential speed rolling (HRDSR), followed by controlled annealing and aging treatments. Partial recrystallization during annealing produced a microstructure comprising recrystallized and unrecrystallized grains, enabling a favorable balance between strength and ductility. Optimal annealing at 1123 K for 48 h produced a partially recrystallized microstructure, consisting of fine recrystallized grains (∼2.2 μm) embedded in unrecrystallized regions. This microstructural configuration yielded a high yield strength of 0.83 GPa and a uniform elongation of 18.3 %. Subsequent aging promoted the formation of nanoscale L12-type γ′ precipitates, further increasing the yield strength to 1.1 GPa while maintaining good uniform ductility (∼12 %). The mechanical response was analyzed considering grain refinement, dislocation density, recrystallization behavior, and precipitation strengthening. This integrated thermo-mechanical approach provides a practical and effective means of enhancing the strength–ductility synergy in MP159 superalloys for advanced structural applications.

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Contributing Institute(s):

1. FS DOOR-User (FS DOOR-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20240928 (I-20240928) (I-20240928)

Experiment(s):

1. PETRA Beamline P21.1 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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