Record number :
2154066
Title of article :
Temperature dependence of MC decomposition behavior in Ni-base superalloy GTD 111
Author/Authors :
Choi، نويسنده , , Baig Gyu and Kim، نويسنده , , In Soo and Kim، نويسنده , , Doo Hyun and Jo، نويسنده , , Chang Yong، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Pages :
7
From page :
329
To page :
335
Abstract :
Microstructural evolution including MC decomposition during thermal exposure in GTD 111 has been investigated. After standard heat treatment, polycrystalline GTD 111 specimens were thermally exposed up to 10,000 h in the temperature range of 871–982 °C. Quantitative and qualitative metallographic analyses have been carried out to identify distribution and composition of the existing phases. Growth rate of γ′ of the alloy was proportional to the 1/3 power of the exposed time. The activation energy calculated for γ′ coarsening was 256 kJ/mol. MC carbides decomposed into η and M23C6 during thermal exposure at 871 and 927 °C rather than M23C6 and γ′. Precipitation of sigma (σ) phase was observed in the vicinity of MC or M23C6 carbides, especially in the specimen exposed at 871 °C. Continuous γ′ and M23C6 film precipitated along the grain boundary and fine η within γ–γ′ eutectic pool dissolved during thermal exposure at 982 °C.
Keywords :
GTD 111 , Thermal exposure , MC decomposition , Eta phase
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Serial Year :
2008
Link To Document :
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