Journal ArticleDOI
Effect of Surface Preparation on Intergranular Stress Corrosion Cracking of Alloy 600 in Hydrogenated Steam
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In this article, it is shown that mechanically polished surfaces are more resistant to stress corrosion cracking (SCC) than electropolished surfaces, which is related to short-circuit diffusion of Cr to the surface, which promotes external rather than internal oxidation.Abstract:
In the literature it is a common belief that electropolishing mitigates primary water stress corrosion cracking (PWSCC) because it removes superficial cold work. Here, it is shown that electropolished Alloy 600 (UNS N06600) exposed to hydrogenated steam undergoes internal Cr oxidation, whereas mechanical polishing induces external oxidation. This has implications for SCC initiation, which has been tested with different surface preparations (electropolishing and mechanical polishing) using reverse-U-bend (RUB) and C-ring samples. The results show a systematic trend that mechanically polished surfaces are more resistant to stress corrosion cracking (SCC) than electropolished surfaces. The mechanism involved in this increased resistance is thought to be related to short-circuit diffusion of Cr to the surface, which promotes external rather than internal oxidation. The role of compressive stress induced by mechanical polishing is a less-likely explanation of the observed effects. Mechanical polishing...read more
Citations
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Journal ArticleDOI
Sensitivity of stress corrosion cracking of stainless steel to surface machining and grinding procedure
Alan Turnbull,Ken Mingard,J.D. Lord,Bryan Roebuck,D R Tice,K J Mottershead,N D Fairweather,A K Bradbury +7 more
TL;DR: In this paper, the effect of surface preparation method on the susceptibility of a 304H stainless steel to stress corrosion cracking under simulated atmospheric corrosion conditions was investigated, where MgCl2 was deposited onto four-point bend specimens, which were then placed in a chamber with a relative humidity of 45% and temperature of 60 °C.
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Influence of dissolved oxygen on oxide films of Alloy 690TT with different surface status in simulated primary water
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Internal oxidation of Alloy 600 exposed to hydrogenated steam and the beneficial effects of thermal treatment
TL;DR: In this article, Alloy 600 in solution annealed (SA) and thermally treated (TT) conditions was exposed to a hydrogenated steam environment considered to simulate primary water in pressurized water reactors.
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Corrosion pitting and environmentally assisted small crack growth
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Effect of electropolishing on corrosion of nuclear grade 316L stainless steel in deaerated high temperature water
TL;DR: In this paper, the effect of change in surface composition and microstructure by electropolishing on corrosion of nuclear grade 316L stainless steel in deaerated high temperature water was investigated.
References
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Some possible mechanisms of intergranular stress corrosion cracking of Alloy 600 in PWR primary water
Peter Scott,M. Le Calver +1 more
ReportDOI
Primary Water SCC Understanding and Characterization Through Fundamental Testing in the Vicinity of the Nickel/Nickel Oxide Phase Transition
TL;DR: In this article, the authors quantified the nickel alloy stress corrosion crack growth rate (SCCGR) dissolved hydrogen level functionality in terms of the stability of nickel oxide not the dissolved hydrogen levels, and the observed SCCGR dependency has been extended to lower temperatures through the developed model and contact electrical resistance measurements of the nickel/nickel oxide phase transition.
Journal Article
Oxidation embrittlement of alloy 600 in hydrogenated steam at 400°C
TL;DR: In this paper, internal oxidation mechanisms contribute to primary water stress corrosion cracking (PWSCC) of Alloy 600 in nuclear power plants, and they are identified as a major cause of PWSCC.
Influence of hydrogen partial pressure on the IGSCC behavior of Alloy 600 tubing in 360/sup 0/C water or 400/sup 0/C steam
TL;DR: In this article, the authors showed that the hydrogen partial pressure in the environment influences the intergranular stress corrosion cracking (IGSCC) behavior of Ni-Cr-Fe Alloy 600 split tubing reverse U-bends in 400/sup 0/C hydrogen-containing steam at 208 MPa.