Microstructure and high cycle fatigue fracture surface of a Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy

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

卷:575

Article

Wu, G. Q.¹  Shi, C. L.¹  Sha, W.²  Sha, A. X.³  Jiang, H. R.¹ 

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

[2] Queens Univ Belfast, Sch Planning Architecture & Civil Engn, Belfast BT7 1NN, Antrim, North Ireland

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

关键词: Titanium alloy;    Bimodal microstructure;    Lamellar microstructure;    Basketweave microstructure;    High cycle fatigue;    Initiation region;   

DOI  :  10.1016/j.msea.2013.03.047

来源: Elsevier

【 摘 要 】

Because of the requirements for the damage tolerance and fatigue life of commercial aircraft components, the high cycle fatigue (HCF) properties of Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy forgings are important. The effects of microstructure types of the alpha+beta titanium alloy on fatigue properties need to be understood. In this paper, by analysing the fracture surfaces of the titanium alloy having four types of microstructure, the effects of microstructure are investigated. The differences of initiation areas and crack propagation among different microstructures were studied. It was found that the area of the initiation region decreases in the order of coarse basketweave, fine basketweave, Widmanstatten, and bimodal microstructure. (C) 2013 Elsevier B.V. All rights reserved.

【 授权许可】

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