Initiation and early growth of short fatigue cracks at inclusions
作者:
KaynakC.,
AnkaraA.,
BakerT. J.,
期刊:
Materials Science and Technology
(Taylor Available online 1996)
卷期:
Volume 12,
issue 5
页码: 421-426
ISSN:0267-0836
年代: 1996
DOI:10.1179/026708396790165830
出版商: Taylor&Francis
数据来源: Taylor
摘要:
In this study, the initiation and early growth behaviour of short fatigue cracks in En 7A steel with a high content of elongated MnS inclusions was investigated, by generating and evaluating data on the growth of short fatigue cracks under various stress levels and stress ratios for the six principal specimen orientations. Short cracks usually initiated at the debonded interfaces between the matrix and the inclusions. If there was no debonding, cracking sometimes occurred in the inclusions. In the early stages, short cracks propagated by a mechanism of inclusion influenced growth. Under low stress levels, usually one short crack was initiated which dominated most of the fatigue life, while under high stress levels there was multicrack interaction.MST/3249A
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