MC Carbide Decomposition during Thermal Exposure of Polycrystalline Ni-Base Superalloys

Abstract:

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MC decompositions during thermal exposure have been investigated in three conventional cast Ni-base superalloys, GTD111, IN738LC, and CM247LC. MC decomposition in GTD111 and IN738LC depends on exposure temperature. While MC decomposed into M23C6 at 982°C, η formed from MC after exposure at 927°C and 871°C. Ta and Ti separated from MC during thermal exposure made η phase to form instead of γ'. The decomposition of the MC in CM247LC depends on their morphology and position. Segregation during casting process affected the morphology and composition of MC type carbide in this alloy. Acicular M6C was found near scriptal MC in the dendrite. Blocky MC near γ-γ' eutectic decomposed into M23C6. Both M23C6 and M6C can be found on grain boundary after thermal exposure in CM247LC.

Info:

Periodical:

Solid State Phenomena (Volumes 124-126)

Edited by:

Byung Tae Ahn, Hyeongtag Jeon, Bo Young Hur, Kibae Kim and Jong Wan Park

Pages:

1505-1508

DOI:

10.4028/www.scientific.net/SSP.124-126.1505

Citation:

B. G. Choi et al., "MC Carbide Decomposition during Thermal Exposure of Polycrystalline Ni-Base Superalloys", Solid State Phenomena, Vols. 124-126, pp. 1505-1508, 2007

Online since:

June 2007

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Price:

$35.00

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