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Measurement of the Nickel/Nickel Oxide Phase Transition in High Temperature Hydrogenated Water Using the Contact Electric Resistance (CER) Technique

Description: Prior studies of Alloy 600 and Alloy X-750 have shown the existence of a maximum in stress corrosion cracking (SCC) susceptibility in high temperature water (e.g., at 360 C), when testing is conducted over a range of dissolved (i.e., aqueous) hydrogen (H{sub 2}) concentrations. It has also been shown that this maximum in SCC susceptibility tends to occur in proximity to the nickel/nickel oxide (Ni/NiO) phase transition, suggesting that oxide phase stability may affect primary water SCC (PWSCC) … more
Date: May 8, 2001
Creator: Attanasio, S. A.; Morton, D. S.; Ando, M. A.; Panayotou, N. F. & Thompson, C. D.
Partner: UNT Libraries Government Documents Department
open access

Stress Corrosion Crack Growth Rate Testing and Analytical Electron Microscopy of Alloy 600 as a Function of Pourbaix Space and Microstructure

Description: Stress corrosion crack (SCC) growth rate tests and analytical electron microscopy (AEM) studies were performed over a broad range of environments and heat treatments of Alloy 600. This effort was conducted to correlate bulk environmental conditions such as pH and electrochemical potential (EcP) with the morphology of the SCC crack. Development of a library of AEM morphologies formed by SCC in different environments is an important step in identifying the conditions that lead to SCC in component… more
Date: October 4, 2000
Creator: Lewis, N.; Attanasio, S. A.; Morton, D. S. & Young, G. A.
Partner: UNT Libraries Government Documents Department
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The Effect of pH on Nickel Alloy SCC and Corrosion Performance

Description: Alloy X-750 condition HTH stress corrosion crack growth rate (SCCGR) tests have been conducted at 360 C (680 F) with 50 cc/kg hydrogen as a function of coolant pH. Results indicate no appreciable influence of pH on crack growth in the pH (at 360 C) range of {approx} 6.2 to 8.7, consistent with previous alloy 600 findings. These intermediate pH results suggest that pH is not a key variable which must be accounted for when modeling pressurized water reactor (PWR) primary water SCC. In this study,… more
Date: October 10, 2002
Creator: Morton, D.S. & Hansen, M.
Partner: UNT Libraries Government Documents Department
open access

Primary Water SCC Understanding and Characterization Through Fundamental Testing in the Vicinity of the Nickel/Nickel Oxide Phase Transition

Description: This paper quantifies the nickel alloy stress corrosion crack growth rate (SCCGR) dissolved hydrogen level functionality. SCCGR has been observed to exhibit a maximum in proximity to the nickel/nickel oxide phase transition. The dissolved hydrogen level SCCGR dependency has been quantified in a phenomenological model in terms of the stability of nickel oxide not the dissolved hydrogen level. The observed SCCGR dependency has been extended to lower temperatures through the developed model and Co… more
Date: May 8, 2001
Creator: Morton, D. S.; Attanasio, S. A. & Young, G. A.
Partner: UNT Libraries Government Documents Department
open access

Colloidal particle deposition in turbulent flow

Description: A theoretical analysis is presented which describes the initial deposition of monodispersed spherical colloidal particles from a steady fully developed turbulent flow onto conduit walls. When the net particle-conduit electrical interaction potential is attractive, particle deposition is shown to be often governed by turbulent hydrodynamics. When the net particle-conduit electrical interaction potential possess a repulsive maximum, particle deposition to first order is uniform and depends solely… more
Date: May 1, 1994
Creator: Morton, D. S.
Partner: UNT Libraries Government Documents Department
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Effect of soluble zinc additions on the SCC performance of nickel alloys in deaerated hydrogenated water

Description: Stress corrosion crack growth rates (SCCGR) of alloy 600, EN82H and X-750 were measured in deaerated hydrogenated water to determine if soluble zinc mitigates SCCGR. Constant load compact tension specimen tests were conducted. Two test strategies were used to discern a possible zinc effect. The first strategy employed separate SCCGR tests in zinc and non-zinc environments and compared the resulting crack growth rates. The second strategy varied zinc levels at the midterm of single specimen SCCG… more
Date: August 1, 1997
Creator: Morton, D.S.; Thompson, C.D.; Gladding, D. & Schurman, M.K.
Partner: UNT Libraries Government Documents Department
open access

Influence of dissolved hydrogen on nickel alloy SCC in high temperature water

Description: Stress corrosion crack growth rate (SCCGR) tests of nickel alloys were conducted at 338 C and 360 C as a function of the hydrogen concentration in high purity water. Test results identified up to a 7 x effect of hydrogen levels in the water on crack growth rate, where the lowest growth rates were associated with the highest hydrogen levels. At 338 C, the crack growth rate decreased as the hydrogen levels were increased. However, different results were observed for the test conducted at 360 C. A… more
Date: March 1, 1999
Creator: Morton, D. S.; Attanasio, S. A.; Fish, J. S. & Schurman, M. K.
Partner: UNT Libraries Government Documents Department
open access

The Influence of Dissolved Hydrogen on Nickel Alloy SCC: A Window to Fundamental Insight

Description: Prior stress corrosion crack growth rate (SCCGR) testing of nickel alloys as a function of the aqueous hydrogen concentration (i.e., the concentration of hydrogen dissolved in the water) has identified different functionalities at 338 and 360 C. These SCCGR dependencies have been uniquely explained in terms of the stability of nickel oxide. The present work evaluates whether the influence of aqueous hydrogen concentration on SCCGR is fundamentally due to effects on hydrogen absorption and/or co… more
Date: October 12, 2000
Creator: Morton, D. S.; Attanasio, S. A.; Young, G. A.; Andresen, P. L. & Angeliu, T. M.
Partner: UNT Libraries Government Documents Department
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