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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

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Evans, W. M., and Wire, G. L., 2001, “Fatigue Crack Propagation Behavior of 304 Stainless Steel From Compact Tension Specimens in An Elevated Temperature Aqueous Environment,” PVP-Vol. 439, Pressure Vessel and Piping Codes and Standards-2002, PVP2002-1226, ASME, New York, pp. 91–98.
Wire, G. L., Leax, T. R., and Kandra, J. T., 1999, “Mean Stress and Environmental Effects on Fatigue In Type 304 Stainless Steel,” Probabilistic and Environmental Aspects of Fracture and Fatigue, PVP-Vol. 386, ASME, New York, pp. 213–228.
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Figures

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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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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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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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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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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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