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This paper presents an experimental set-up developed for the simulation of overheatings under load representative of One Engine Inoperative events which can be encountered during in-service operation of turboshaft engines. These experiments provide several breakthroughs over classical testing equipments for the non-isothermal testing conditions of single crystal Ni-based superalloys. It was shown a major effect of thermal transition rates on the material behavior which was explained by microstructural evolutions.