Progress on Oxidation-fatigue Crack Propagation Mechanisms and Life Prediction in Turbine Disc Alloys

doi:10.3901/JME.2021.16.122

Abstract

Abstract: During the duty cycle of the aeroengines, turbine discs are subjected to cyclic thermal and mechanical loads, which usually cause failure in turbine discs due to the interaction between fatigue, creep and oxidation. With the development of high thrust-to-weight aeroengines and the increase of turbine inlet temperature, effects of oxidation damage on the fatigue crack propagation at the turbine disc surface become more and more significant, and it usually results in an increase of fatigue crack growth rate by one-two orders of magnitude. The effects of oxidation damage on fatigue crack propagation and the oxidation mechanisms at the crack tip in turbine disc alloys are reviewed, and the competing effects of fatigue damage, oxidation damage and dynamic embrittlement at the crack tip on crack propagation are analyzed. The fatigue crack propagation numerical models and simulation methods that incorporate the effects of oxidation damage are assessed, and the work to be conducted to realise high accuracy fatigue crack propagation life prediction is proposed, which is expected to be useful to promote the development of aeroengine turbine disc damage tolerance design methods and tools.

Key words: Ni-based superalloys, fatigue crack propagation, crack tip, oxidation damage, life prediction

CLC Number:

TG156

JIANG Rong, WU Changhao, WAN Yuwei, ZHANG Lu, SONG Yingdong. Progress on Oxidation-fatigue Crack Propagation Mechanisms and Life Prediction in Turbine Disc Alloys[J]. Journal of Mechanical Engineering, 2021, 57(16): 122-131.

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