某压气机叶片疲劳失效分析

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Abstract： A blade broke from the tenon. Macroscopic inspection， microscopic inspection， metallgraphic structure andhardnessinspection were caried outon the blade and its corresponding mortiseand groove.The resultsshowed thatthere werenoabnormalities in the bladematerialand metallographic structure，and the hardness met the requirements.The fracture nature of the blade was high-cycle fatigue，with multiple fatigue Zones，andthe source area wasa short-term source.The initiationofcracks wasrelated to fretting damageon the side of the tenon; The silver layer nearthe edge of the mating surface of the blade tenonand the mortise is incomplete，there is residual sand on the surface of the metal substrate，and the tenon and the mortise are tightly fitted.These factors wil deteriorate the surface contact state and cause local fretting damage.

Keywords：blade; titaniumalloy;fatigue fracture;trace analysis; frettingwear

1 序言

TC11作为一种马氏体型 两相热强钛合金，因其卓越的力学性能和耐热性，被广泛应用于制造航空和宇航领域关键构件[1，2]。（剩余4193字）