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Acta Metall Sin  1991, Vol. 27 Issue (5): 54-60    DOI:
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EFFECT OF MICROSTRUCTURE OF ALUMINIDE COATING ON HIGH-CYCLE FATIGUE PERFORMANCE OF COATING-SUPERALLOY SYSTEM
FAN Ruilin Institute of Aeronautical Materials; Beijing
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FAN Ruilin Institute of Aeronautical Materials; Beijing. EFFECT OF MICROSTRUCTURE OF ALUMINIDE COATING ON HIGH-CYCLE FATIGUE PERFORMANCE OF COATING-SUPERALLOY SYSTEM. Acta Metall Sin, 1991, 27(5): 54-60.

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Abstract  The high-cycle fatigue performance of different microstructures of aluminide coating-superalloy system has been studied at 900℃. The single phase coating of coarse equiaxial grain NiAl (β) has unfavourabie effect on fatigue life of the coating-superalloy. The fatigue life may shorten if the coating of NiAl (β) was an enrichment of coarse refractory metal grains. While an improvement can be made by dispersing numerous secondary phase particles such as extreme fine γ', quasi-σ phase and others.
Key words:  aluminide coating      coating microstructure      high temperature      high cycle fatigue     
Received:  18 May 1991     
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