Digital Repository, ICF12, Ottawa 2009

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High-Temperature Fatigue Crack Growth Behavior of 17-4 PH Stainless Steels at Various Load Ratios
C.-K. Lin, K.-C. Hsu

Last modified: 2013-05-03


The high-temperature fatigue crack growth (FCG) behavior at 400 and 500oC was
investigated for variously heat-treated 17-4 PH stainless steels under different
load ratios. Results indicated the FCG rates (FCGRs) at 400oC increased with Rratio
at the low ΔK regime and merged together at the high ΔK regime for all the
given heat-treated conditions, except for a peak-aged condition. At 500oC, the
FCGRs of the given alloys increased with R-ratio at low R-ratios and became
comparable at high R-ratios. The variations of FCGR with R-ratio could be
described as an intrinsic FCG behavior based on a Unified Approach.
Accordingly, the predominant FCG mechanism was similar to a general plastic
blunting process except for the high R-ratio regime of the peak-aged condition
tested at 400oC.

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