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TECHNICAL PAPERS

Fatigue Crack Propagation Rates for Notched 304 Stainless Steel Specimens In Elevated Temperature Water

[+] Author and Article Information
Gary L. Wire, William J. Mills

Bechtel Bettis, Inc., West Mifflin, PA 15122-0079

J. Pressure Vessel Technol 126(3), 318-326 (Aug 18, 2004) (9 pages) doi:10.1115/1.1767859 History: Received May 29, 2003; Online August 18, 2004; Revised December 23, 2004
Copyright © 2004 by ASME
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References

Figures

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Double-edge notched fatigue specimen with EPD (Grip details not shown, all dimensions in mm)
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Short crack growth rates from DEN specimens. Rates normalized by deep crack rates using positive ΔK, Eq. 2
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Environmental effects in DEN tests. Stress amplitude and other test parameters on plots
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304 SS DEN crack growth rates in water vs air. Trend shows decreased ER at high air rate. Air rates are calculated directly from control tests
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Comparison of DEN to surface crack data. Surface crack data tested in HWC 16
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Comparison of DEN to CT data in HWC Large environmental effects extend to low air rates
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304 SS crack growth rates in water at 288 °C. Rise time (Tr) is in seconds
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Normalized 304 SS FCP Data vs ΔK. Normalization: (1-R)−1,1Tr0.31 to R=0, Tr=150 s
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Normalized 304 SS CT FCP Data at Low Potential. Normalization: (1−R)−1.1,Tr0.31 to R=0,Tr=150 s
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Fractographs of 304 SS tested in 24°C air. (a) Irregular quasi-cleavage facets at da/dN=8×10−5 mm/cycle. Arrow denotes failed twin boundary. (b) Striations and dimples at 1×10−2 mm/cycle
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Repeated contact between crack surfaces (R=−1). (a) Rub marks at low ΔK levels in 288°C air. (b) Striations surrounded by severely rubbed regions (24°C air).
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Fractographs of 304 SS fatigue tested in (a) 24°C air showing irregular facets (b) 288°C air showing cleavage-like facets (c) 288°C water with crystallographic facets that are sharp, cleavage-like, and highly angular.
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Fractographs of 304 SS fatigue tested in 288°C water. (a) Highly angular faets persist to 3×10−4 mm cycle. (b) High magnification of (a) shows fatigue striations superimposed on facet faces

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