Corrosion Fatigue Behavior of Low-Alloy Pressure Vessel Steels in High Temperature Water Under Multi-Factor Conditions

[+] Author and Article Information
Xinqiang Wu, Yasuyuki Katada

Steel Research Center, National Institute for Materials Science, Tsukuba, Ibaraki, 305-0047, Japan

J. Pressure Vessel Technol 126(4), 466-472 (Dec 01, 2004) (7 pages) doi:10.1115/1.1811107 History: Received August 01, 2004; Revised August 04, 2004; Online December 01, 2004
Copyright © 2004 by ASME
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The S−N curves in 288°C and 100 ppb water
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Dependence of LCF life of a A533B steel (0.007 wt.%S) on (a) strain rate (b) DO (c) temperature in high temperature water
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Strain waveforms used in (a) HTL (b) LTH tests
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The strain-rate dependence of fatigue life
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Relationship between strain amplitude and P
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The dependence of fatigue life on applied strain range under the constant strain rate and strain rate change conditions for (a) low and (b) high-S steels
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The relationship of first-stage cycle fraction f1 and second-stage cycle fraction f2 under strain rate change conditions. (a) LTH and HTL tests, (b) LTH tests fro low and high-S steels, (c) LTH tests under different DO conditions, and (d) LTH tests under different temperature conditions.
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The main crack morphologies on specimen surfaces, arrows show the loading axis: (a) 0.1% s−1, (b) 0.001% s−1, (c) HTL test, f1=0.53, and (d) LTH test, f1=0.53.
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Macro-morphologies of surface secondary cracks on (a) low (b) high-S steel specimens after LTH tests (f1=0.53)
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Relationship between surface long-crack densities and first-stage cycle fraction f1 for the low and high-S steels
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Typical fracture surface morphologies obtained at strain rate of (a) 0.1%s−1 (b) 0.001%s−1 in high temperature water, white arrows show the crack growth direction
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The calculated S−N curves together with the experimental data under strain rate change conditions for low and high-S steels




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