Influence of alpha-case layer on the low cycle fatigue properties of Ti-6Al-2Sn-4Zr-2Mo alloy

被引：40

作者：

Gaddam, R. ^{[1
]}

Antti, M-L. ^{[1
]}

Pederson, R. ^{[1
,2
]}

机构：

[1] Lulea Univ Technol, Div Mat Sci, S-97187 Lulea, Sweden

[2] GKN Aerosp Engine Syst, Res & Technol Ctr, S-46181 Trollhattan, Sweden

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 599卷

关键词：

Electron microscopy; Light microscopy; Mechanical characterization; Titanium alloys; Fatigue; Oxygen effects; TITANIUM-ALLOYS; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; ELEVATED-TEMPERATURE; OXYGEN CONCENTRATION; FRACTURE; TI-6AL-4V; EXPOSURE;

D O I：

10.1016/j.msea.2014.01.059

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Strain-controlled low cycle fatigue properties of Ti-6Al-2Sn-4Zr-2Mo with different thickness of alpha-case layers were investigated. Results show that at strain amplitudes 0.3% and 0.4%, the fatigue life of the alloy is reduced for the specimens with alpha-case layer compared to the ones without any alpha-case. It was noted that with a 2 mu m thick alpha-case layer the low cycle fatigue life is reduced about 50% at the higher strain amplitude. The degrading effect of the alpha-case layer on fatigue life increased with increasing thickness. The alpha-case layer at the surface is enriched with oxygen making the surface harder and brittle, which results in easier crack initiation and thus decrease in fatigue life. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：51 / 56

页数：6

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