Abstract
Ni-Cr superalloy has been widely used in turbomachinery equipments. Gas turbine blade made from Ni-Cr superalloys experience the effect of high temperature and stress during service which certainly cause various microstructural changes. It is found that the formation of spheroidal gamma prime (γ') phase replacing the cuboidal γ' phase and also the formation of M23C6 carbides along the grain boundaries. Numerous previous study has been conducted and reported that the microstructure of the turbine blade are being modified by service. This study involved assessing changes in blade microstructure and microhardness as a function of service time.
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