The Influence of Thermal Exposure on the Microstructure Evolution of a Nickel-Base Single Crystal Superalloy

Yu Xian Jia; Tao Jin; Jin Lai Liu

doi:10.4028/www.scientific.net/AMR.418-420.265

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The Influence of Thermal Exposure on the Microstructure Evolution of a Nickel-Base Single Crystal Superalloy
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The Influence of Thermal Exposure on the Microstructure Evolution of a Nickel-Base Single Crystal Superalloy

Abstract:

Microstructure evolution of a nickel-base single crystal superalloy on the [001], [011] and [111] orientation during thermal exposure at 1000°C was investigated. The SEM studies revealed that the size of γ' phase increased and some of which linked together with the elongation of the exposure time. After 1100h the cubic γ' phase hardly is observed, and the rafting structure becomes perfect. With growing and linking of γ' phase the γ matrix channel is widening gradually, and the direction of γ' rafts is not along one define orientation. The TCP phase is not found in the three oriented samples during the thermal exposure.