Chiang Mai Journal of Science

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Inconel 738, as a cast nickel-based superalloy components for land-based gas turbine blades, utilized at elevated temperatures, expresses microstructural stability with excellent mechanical properties. In this study, the microstructural refurbishment by a hot isostatic pressing (HIP) and different heat treatment conditions after long-term service of  the alloy was investigated. Although, the HIP temperature in the HIP process was high enough to act as solutioning treatment, it could not completely dissolve coarse  γ' particles into the matrix, resulting in the residue particles. However, the next step, solutioning treatment, could dissolve these particles more in some extent depending on each solutioning temperature. The higher solutioning temperature provided the finer γ particles and new γ' precipitation after solutioning that could take place during primary aging. Secondary aging led to the growth of  coarse and/or very fine γ' particles. All heat treatment conditions after HIP process provided much more uniform γ' morphology comparing to as-received microstructure.

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