ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Fatigue crack growth (FCG) tests have been performed in an X70 steel with variousmicrostructures (respectively in the as-received and the normalized condition). The effect of roomtemperature creep (RTC) on FCG behavior has been investigated by comparing with single waveoverloads (SWOL). The as-received X70 pipeline steel has high FCG rate at the near-thresholdregion. While at the Paris region, FCG rate seems insensitive to the microstructure. In bothconditions, time-dependent deformation is observed at crack tips (i.e., RTC), which increases withincreasing stress-intensity-factor. And this deformation has a high value in the normalized state,under identical testing conditions. Both RTC and SWOL can bring subsequent fatigue crack growtha very short initial acceleration before deceleration, whereas the former induces more seriousdeceleration and retardation, which attributes to more significant crack closures
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.138.pdf
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