Intergranular attack and stress corrosion cracking propagation behavior of alloy 600 in high-temperature caustic solution

Journal Article · Tue Jun 01 04:00:00 EDT 1999 · Corrosion

DOI:https://doi.org/10.5006/1.3280497· OSTI ID:6199663

Kawamura, H; Hirano, H ^[1]

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1. Central Research Inst. of the Electric Power Industry, Komae, Tokyo (Japan). Komae Research Lab.

The effect of stress intensity factors (K) at the intergranular attack and stress corrosion crack (IGA/SCC) tips on the IGA/SCC propagation behavior of steam generator (SG) tubing was studied under accelerated test conditions. Values of K at the IGA/SCC crack tips were calculated using the statically indeterminate model. Based upon analysis of those factors, the double-cantilever beam (DCB) and SG model boiler tests were carried out to evaluate the effect of stress intensity on IGA/SCC crack propagation. K at the crack tips increased with increasing crack length. For a long crack, K decreased with an increasing number of cracks. However, for a short crack, K decreased slightly with an increasing number of cracks. DCB test results showed the IGA/SCC crack velocity of alloy 600 (UNS N06600) increased gradually with increasing K in the range from 15 MPa[radical]m to [approximately]60 MPa[radical]m. This is the range relevant to IGA/SCC crack tips of typical SG tubes under operating conditions of Pressurized-water reactors. Metallographic examination of tubes removed from the SG model boiler, fouled with 10 ppm sodium hydroxide (NaOH), showed IGA/SCC propagation rates were almost constant in the tested range of K.

• OSTI ID: 6199663
• Journal Information: Corrosion, Journal Name: Corrosion Vol. 55:6; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

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