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Journal of Nanomaterials
Volume 2014 (2014), Article ID 863767, 6 pages
http://dx.doi.org/10.1155/2014/863767
Research Article

Fatigue Crack Behavior of Stainless Steel 304 by the Addition of Carbon Nanotubes

School of Mechanical Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China

Received 26 January 2014; Accepted 19 February 2014; Published 7 April 2014

Academic Editor: Chunyi Zhi

Copyright © 2014 Rizwanulhaque Syed and Wei Jiang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Fatigue is the main source of almost half of whole mechanical failures. This research investigated the effect on cyclic fatigue behavior of stainless steel 304 (SS304) when including carbon nanotubes (CNTs) at the crack tip. The cyclic fatigue tests were conducted on compact tension (CT) specimens to establish the relationship between crack growth and the number of cycles (a-N). It is found that the incorporation of a small amount of CNTs increased the fatigue life of the SS304/metal. Micrographs showed that the enhancement in fatigue life is caused by CNTs dense arrangement around the crack tip, entangled with each other, and finer grain size. Smooth bonding at the interface of the CNTs and SS304 grains is also observed.