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Indexed by:期刊论文

Date of Publication:2015-01-01

Journal:JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:29

Issue:1

Page Number:291-296

ISSN No.:1738-494X

Key Words:CO2 laser; Fatigue life; Fatigue crack growth; Multi-walled carbon nanotubes; Stainless steel

Abstract:Stainless steel is among the most widely used industrial materials. In particular, stainless steel 304 (304SS) is the most used material grade. To increase the utilization of any industrial material, its fatigue life should be optimized. In this work, the fatigue life of 304SS was enhanced by the addition of multi-walled carbon nanotubes (MWCNTs). Moreover, the incorporation of a small amount of MWCNTs increased the fatigue life of 304SS. Scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction (XRD) results showed that the suppression of fatigue crack growth rate was caused by CNT deposition at the crack tip. CNTs were entangled with each other, thereby resulting in finer grain size. The XRD diffractograms of the 304SS treated area peak showed that the microstructure consisted of austenite and carbon.