Fatigue crack propagation of super duplex stainless steel with dispersed structure and time-frequency analysis of acoustic emission

The fatigue crack propagation of super duplex stainless steel was investigated for the effect of various volume fractions of the austenite phase by changing the heat treatment temperature. We also analyzed acoustic emission signals obtained during the fatigue crack propagation by the time-frequency...

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Bibliographic Details
Published in:Metals and materials international 2001-06, Vol.7 (3), p.227-231
Main Authors: Nam, Ki-Woo, Kang, Chang-Yong, Do, Jae-Yoon, Ahn, Seok-Hwan, Lee, Sang-Kee
Format: Article
Language:English
Subjects:
Acoustic emission
Acoustic fatigue
Acoustic propagation
Alloys
Austenite
Crack propagation
Dimpling
Duplex stainless steels
Emission analysis
Fatigue failure
Fatigue life
Fatigue tests
Heat treatment
Metal fatigue
Metallurgy
Propagation
Time-frequency analysis
Volume fraction
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Summary:The fatigue crack propagation of super duplex stainless steel was investigated for the effect of various volume fractions of the austenite phase by changing the heat treatment temperature. We also analyzed acoustic emission signals obtained during the fatigue crack propagation by the time-frequency analysis method. As the temperature of the heat treatment increased, the volume fraction of austenite decreased and coarse grain was obtained. The specimen treated at 1200 had a longer fatigue life and slower rate of crack growth. Results of time-frequency analysis of acoustic emission signals during the fatigue test showed the main frequency of 200-300 kHz to have no correlation with heat treatment and crack length, and the 500 kHz signal to be due to dimples and separation of inclusion.
ISSN:1598-9623
2005-4149
DOI:10.1007/BF03026980