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09413 Comparison of LPSCC Crack Tips of Alloy 132 and Alloy 600 - Influence of Dissolved Hydrogen

Picture for 09413 Comparison of LPSCC Crack Tips of Alloy 132 and Alloy 600 - Influence of Dissolved Hydrogen
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Product Number: 51300-09413-SG
ISBN: 09413 2009 CP
Author: Takuyo Yamada, Kiyotomo Nakata, Nobuo Totsuka, Masayoshi Ozawa, Takumi Terachi andTomoki Miyamoto
Publication Date: 2009
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To examine the relationship between corrosion and crack growth rate, stress corrosion cracking (SCC) tests of nickel-based alloys were carried out under the simulated conditions of a pressurized water reactor. The crack growth rate of Alloy 600 was ten times slower than that of Alloy 132, and cold work indicated an accelerating effect. Although 20% cold work should accelerate SCC susceptibility, no SCC cracks were observed in Alloy 690. In addition, a suppression effect was observed under the conditions without dissolved hydrogen for both Alloy 600 and Alloy 132. Grain boundary oxidation was not observed on the crack tip in the water without dissolved hydrogen (DH), but was observed in 15- and 30cc-STP/kg-H2O, therefore, oxidation at the grain boundary might have an effect on the crack growth rate. The results of crack tip observations suggest that grain boundary oxidation plays an important role in the phenomenon of SCC.

Keywords: nickel-based alloy, stress corrosion cracking, weld metal, pressurized water reactor, corrosion, grain boundary oxidation, creep, crack tip analysis
To examine the relationship between corrosion and crack growth rate, stress corrosion cracking (SCC) tests of nickel-based alloys were carried out under the simulated conditions of a pressurized water reactor. The crack growth rate of Alloy 600 was ten times slower than that of Alloy 132, and cold work indicated an accelerating effect. Although 20% cold work should accelerate SCC susceptibility, no SCC cracks were observed in Alloy 690. In addition, a suppression effect was observed under the conditions without dissolved hydrogen for both Alloy 600 and Alloy 132. Grain boundary oxidation was not observed on the crack tip in the water without dissolved hydrogen (DH), but was observed in 15- and 30cc-STP/kg-H2O, therefore, oxidation at the grain boundary might have an effect on the crack growth rate. The results of crack tip observations suggest that grain boundary oxidation plays an important role in the phenomenon of SCC.

Keywords: nickel-based alloy, stress corrosion cracking, weld metal, pressurized water reactor, corrosion, grain boundary oxidation, creep, crack tip analysis
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