SEM in-situ fatigue observation on crack initiation and growth from inclusion in P/M Rene95 superalloy

被引：0

作者：

Zhang, L ^{[1
]}

Dong, JX ^{[1
]}

Xie, XS ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

来源：

JOURNAL OF UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING | 2001年 / 8卷 / 03期

关键词：

inclusion; P/M superalloy; LCF; SEM in-situ fatigue;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A special designed experiment was conducted for observing crack initiation and growth in P/M Rene95 superalloy under tension-tension loading by self-made SEM in-situ fatigue loading stag. Several alumina inclusion particles exposed at the specimen surface were observed carefully. During fatigue test inclusions led to cracks initiation. The cracks can be formed by two mechanisms. Generally, the cracks nucleated at the interface between inclusion and matrix. Sometimes, cracks were also formed inside the inclusion. As the increase of cycles, some cracks at the interface between inclusion and matrix broadened and propagated along the direction about 45 degrees to the loading axis. On the other hand, the cracks inside the inclusion propagated in the inclusion and towards matrix.

引用

页码：195 / 197

页数：3