NDLI: Effect of Microstructural Parameters on Fatigue Crack Propagation in an API X65 Pipeline Steel

Content Provider	Springer Nature Link
Author	Mohtadi Bonab, M. A. Eskandari, M. Ghaednia, H. Das, S.
Copyright Year	2016
Abstract	In the current research, we investigate fatigue crack growth in an API X65 pipeline steel by using an Instron fatigue testing machine. To this, first the microstructure of steel was accurately investigated using scanning electron microscope. Since nonmetallic inclusions play a key role during crack propagation, the type and distribution of such inclusions were studied through the thickness of as-received X65 steel using energy-dispersive spectroscopy technique. It was found that the accumulation of such defects at the center of thickness of the pipe body was higher than in other regions. Our results showed that there were very fine oxide inclusions (1-2 µm in length) appeared throughout the cross section of X65 steel. Such inclusions were observed not at the fatigue crack path nor on both sides of the fatigue crack. However, we found that large manganese sulfide inclusions (around 20 µm in length) were associated with fatigue crack propagation. Fatigue experiments on CT specimens showed that the crack nucleated when the number of fatigue cycles was higher than 340 × 10$^{3}$. On fracture surfaces, crack propagation also occurred by joining the microcracks at tip of the main crack.
Starting Page	4933
Ending Page	4940
Page Count	8
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	25
Issue Number	11
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2016-09-19
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	back-scattered electron energy-dispersive spectroscopy fatigue crack pipeline steel scanning electron microscopy Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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