Observation of fretting fatigue cracks of Ti6A14V titanium alloy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:707

Article

Li, Z. Y.^1,2  Liu, X. L.¹  Wu, G. Q.¹  Sha, W.³ 

[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

[2] Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China

[3] Queens Univ Belfast, Sch Nat & Built Environm, Belfast BT7 1NN, Antrim, North Ireland

关键词: Fracture mechanics/fracture behaviour/fatigue;    Titanium alloys;    Electron microscopy;    Grains and interfaces;    Characterization;   

DOI  :  10.1016/j.msea.2017.09.005

来源: Elsevier

【 摘 要 】

Using a test system developed in laboratory, the fretting fatigue mechanism of Ti6A14V alloy has been studied, with analyses of fracture morphology and composition. The results show that fretting fatigue source area is semi elliptical and occupies a small proportion of the total fracture surface. The area is relatively flat and smooth and shows traces of friction. With the increase of contact pressure, the depth of the source region first increases rapidly and then stabilizes, but the fatigue strength decreases rapidly and then stabilizes. Fretting causes severe oxidation of the surface. In the interface between the source and the fatigue propagation zone, the contents of 0 and Fe drop sharply.

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