The effect of microstructure on fatigue crack propagation of α+β titanium alloys -: In-situ observation of short fatigue crack growth

被引：52

作者：

Nakajima, K ^{[1
]}

Terao, K ^{[1
]}

Miyata, T ^{[1
]}

机构：

[1] Nagoya Univ, Dept Mat Sci & Engn, Nagoya, Aichi 46401, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1998年 / 243卷 / 1-2期

关键词：

microstructure; titanium alloys; short fatigue crack growth;

D O I：

10.1016/S0921-5093(97)00797-1

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Fatigue crack initiation and early stage of crack growth for Ti-6Al-4V and Ti-4.5Al-3V-2Fe-2Mo were investigated on notched specimens. In-situ observation on fatigue cracking processes was made on a fatigue testing machine mounted in a scanning electron microscope. It was found that Ti-4.5Al-3V-2Fe-2Mo alloy with very fine a grains of approximate to 2 mu m exhibited a much higher fatigue strength at 107 cycles than that of Ti-6Al-4V alloy. However, an opposite trend in fatigue life was obtained in the short life regime for the materials tested in the present study. The observed fatigue behavior in both the long and short life regimes is discussed in terms of metallurgical factors responsible for the fatigue behavior of the present materials. (C) 1998 Elsevier Science S.A. All rights reserved.

引用

页码：176 / 181

页数：6

共 7 条

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