Influence of environment on low cycle fatigue damage in Ti-6Al-4V and Ti 6246 titanium alloys

被引：30

作者：

Demulsant, X ^{[1
]}

Mendez, J ^{[1
]}

机构：

[1] ENSMA,URA CNRS 863,MECAN & PHYS MAT LAB,F-86960 FUTUROSCOPE,FRANCE

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1996年 / 219卷 / 1-2期

关键词：

crack initiation; low cycle fatigue damage; short cracks;

D O I：

10.1016/S0921-5093(96)10426-3

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

An experimental study of the initiation and propagation of short cracks naturally obtained on low cycle fatigue (LCF) smooth specimens has been carried out on beta and alpha beta forged titanium alloys. Tests were done at room temperature in ambient air and in vacuum. Three different microstructures have been used. Regularly interrupted tests showed that crack initiation is delayed when tests are performed in vacuum. Surface crack densities were lower in vacuum than in air. Crack growth rates can be either strongly slowed down or unaffected by inert media, depending on the microstructure. Crack initiation sites were modified by air environment for the beta forged alloy only. For one alpha beta forged alloy, an internal failure origin occurred in vacuum. The influence of environment on both crack initiation and short crack propagation is discussed in terms of effective slip length and stress-assisted hydrogen embrittlement.

引用

页码：202 / 211

页数：10

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