The crack growth behavior of Incoloy 800H under fatigue and dwell-fatigue conditions at elevated temperature

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DOIResolve DOI: http://doi.org/10.1007/s12206-012-0507-3
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of Mechanical Science and Technology
ISSN1738-494X
1976-3824
Volume26
Issue7
Pages20232027; # of pages: 5
Subjectfatigue; dwell-fatigue; crack growth rate; trans-granular; oxidation
AbstractFatigue crack growth rate (FCGR) tests with different load ratios and dwell-fatigue crack growth rate (DFCGR) tests with different dwell times were conducted at 750°C for Incoloy 800H. As the load ratio increases from 0.1 to 0.5, the crack growth rate increased and the transition ΔK value from region I to region II (Paris regime) shifted leftward. In DFCGR tests with dwell time of 10 and 30 seconds, the Paris regime started at relatively lower ΔK level and the crack grew much faster than in FCGR tests. However, the crack growth rates between the 10 sec and 30 sec dwell times were relatively similar. The higher crack growth rates in the DFCGR tests compared to FCGR tests was associated with the reduction of the M23C6 precipitates in the vicinity of the advancing crack by the Cr depletion, suggesting the crack propagation in DFCGR conditions was environmentally assisted. The crack growth rate was controlled by trans-granular mode regardless of the dwell time because the dwell time was not enough to cause creep damage.
Publication date
LanguageEnglish
AffiliationAerospace; National Research Council Canada
Peer reviewedYes
Identifier507
NPARC number21268440
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Record identifier35c5a74d-fce9-4225-828f-cdad142d907a
Record created2013-07-15
Record modified2016-05-09
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