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Room Temperature Creep and its Effect on Fatigue Crack Growth in a X70 Steel with Various Microstructures

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Abstract:

Fatigue crack growth (FCG) tests have been performed in an X70 steel with various microstructures (respectively in the as-received and the normalized condition). The effect of room temperature creep (RTC) on FCG behavior has been investigated by comparing with single wave overloads (SWOL). The as-received X70 pipeline steel has high FCG rate at the near-threshold region. While at the Paris region, FCG rate seems insensitive to the microstructure. In both conditions, time-dependent deformation is observed at crack tips (i.e., RTC), which increases with increasing 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 growth a very short initial acceleration before deceleration, whereas the former induces more serious deceleration and retardation, which attributes to more significant crack closures.

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Periodical:

Key Engineering Materials (Volumes 353-358)

Pages:

138-141

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.353-358.138

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Online since:

September 2007

Authors:

De Fu Nie, Jie Zhao

Keywords:

Crack Closure, Fatigue Crack Growth (FCG), Room Temperature Creep, Single Wave Overload, X70 Steel

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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