日本金属学会誌

J. Japan Inst. Metals, Vol. 71, No. 11 (2007),
pp. 1041-1045

On the Observation of Internal Cracks and Microstructure of a Post Service Turbine Blade from a Civil Aeroengine

Tomohito Kimura1,2, Takanobu Suzuki1,2, Yutaka Koizumi2, Tadaharu Yokokawa2, Hiroshi Harada2 and Hachiro Imai1

1Department of Materials Science and Engineering, Shibaura Institute of Technology, Tokyo 135-8548
2High Temperature Materials Group, High Temperature Materials center, Materials Engineering Laboratory, National Institute for Materials Science, Tsukuba 305-0047

Abstract:

A post service examination of a turbine blade from a civil aeroengine has been carried out to ascertain the degree of microstructural coarsening and the distribution of crack damage induced during service. This was with the purpose to elucidate their correlation with the actual operating conditions. Samples were sectioned from different parts of the turbine blade for detailed examination by optical microscope and scanning electron microscope. The average length of cracks was used as one of the parameters to quantitatively illustrate the distribution of cracks on the turbine blade. Experimental results suggested that cracks were mainly concentrated on certain area of the pressure side. Leading edge of the suction side of the turbine blade consisted of mostly coarsened microstructure due to higher temperature exposure. In conclusions, there was no clear correlation between the crack damage distribution and the degree of microstructure evolution.


(Received 2007/4/24)

Keywords:

nickel-based superalloy, turbine blade, crack, microstructure, René142, coarsening, cooling channel


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