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08428 SCC Crack Growth Rates of Austenitic Alloys in Supercritical Water

Picture for 08428 SCC Crack Growth Rates of Austenitic Alloys in Supercritical Water
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Product Number: 51300-08428-SG
ISBN: 08428 2008 CP
Author: Sebastien Teysseyre and Gary Was
Publication Date: 2008
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The stress corrosion crack growth rates of iron and nickel- base austenitic alloys were determined in water in both the subcritical and supercritical regimes using constant extension rate tests and a constant stress intensity factor (K) crack growth rate test. Experiments were performed in the temperature range of 288°C to 550°C, in pure deaerated water and the crack propagation rates obtained with different techniques are compared. The crack propagation rate increased with temperature for all alloys tested in constant extension rate tests. The crack growth rate of cold work Type 316L (UNS S31603) determined under constant K loading mode decreased as temperature increased above 360°C. The crack growth rate behavior is hypothesized to be due to crack blunting due to a high oxidation rate. In CERT tests, increases in cracking are dominated by temperature rather than water density. The validity of the use of constant extension rate tests to determine crack propagation rate is discussed.
The stress corrosion crack growth rates of iron and nickel- base austenitic alloys were determined in water in both the subcritical and supercritical regimes using constant extension rate tests and a constant stress intensity factor (K) crack growth rate test. Experiments were performed in the temperature range of 288°C to 550°C, in pure deaerated water and the crack propagation rates obtained with different techniques are compared. The crack propagation rate increased with temperature for all alloys tested in constant extension rate tests. The crack growth rate of cold work Type 316L (UNS S31603) determined under constant K loading mode decreased as temperature increased above 360°C. The crack growth rate behavior is hypothesized to be due to crack blunting due to a high oxidation rate. In CERT tests, increases in cracking are dominated by temperature rather than water density. The validity of the use of constant extension rate tests to determine crack propagation rate is discussed.
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