On-line monitoring of oxide formation and dissolution on alloy 800H in supercritical water

Choudhry, Kashif I.; Guzonas, David; Kallikragas, Dimitrios T.; Svishchev, Igor M.

doi:10.1016/j.corsci.2016.05.042

Cited by 36 publications

(38 citation statements)

References 30 publications

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“…In flowing water conditions, all or some of the oxide layer can dissolve and be carried away by the coolant, or it can increase in thickness by deposition of oxide transported by the coolant from other corroding locations in the circuit. It is also proposed that in SCW conditions the corrosion mechanism changes from electrochemical to chemical at a density of 100 kg m -3 or at a temperature of about 500 -550 °C / 25 MPa [43].…”

Section: Figure 14 Weight Change Test Results For Different Candidatmentioning

confidence: 99%

Oxidation model for construction materials in supercritical water—Estimation of kinetic and transport parameters

et al. 2015

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Section: Figure 14 Weight Change Test Results For Different Candidatmentioning

confidence: 99%

Oxidation model for construction materials in supercritical water—Estimation of kinetic and transport parameters

et al. 2015

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“…[1,2] It has a solid solution strengthened FeNiCr matrix with additional strengthening from M 23 C 6 and Ti(C,N) precipitates. [3] 800H is commonly used in high temperature applications due to its high resistance to corrosion [4,5] and creep. [6,7] In particular, it is used in the petrochemical industry for methane reformer exit tubing.…”

Section: Incoloy 800hmentioning

confidence: 99%

“…The total minimum strain-rate is evaluated by summing the contributions of each of these mechanisms together, Eq. [5]. The mechanism that provides the largest contribution to the total minimum strain-rate is considered the dominant mechanism.…”

Section: Creep and Creep Mechanismsmentioning

confidence: 99%

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A Deformation Mechanism Map for Incoloy 800H Optimized Using the Genetic Algorithm

Beardsley

Bishop

Kral

2019

Metall Mater Trans A

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A total of fifty-eight Incoloy 800H samples were creep tested between temperatures of 1023-1293 K, stresses of 14.1-105 MPa, and average grain sizes of 87.7-315 µm. Combined with data obtained by the National Institute for Materials Science (NIMS), a deformation mechanism map (DMM) for Incoloy 800H was produced. Optimization of the fit of the constitutive creep equations to the experimental data was performed using a global search iterative numerical optimization tool called a genetic algorithm (GA). It was found that the data were well represented by both high-temperature and low-temperature power-law creep mechanisms, but the extent of the influence of diffusion-based creep mechanisms, most specifically Coble creep, will require further investigation. A training and test method was performed to validate the solution and to test the extrapolability of the dataset. It was determined that the extrapolability of the data in all directions of the DMM was generally low.

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“…From this perspective, it would be advantageous to be able to conduct hydrogen evolution studies and corrosion testing in a more controlled environment, without the need to interrupt the experiment and remove the corrosion coupons. Recently, a continuous flow‐through reactor with tubular test section was employed for online monitoring of hydrogen evolution rates and apparent corrosion rates of Fe–Cr–Ni alloys . This investigation aims at the study of Zr corrosion and hydrogen evolution under high‐temperature and pressure flow conditions.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen evolution and corrosion behavior of zirconium tubing in sub‐ and supercritical water

Choudhry

Svishchev

2019

Materials & Corrosion

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Hydrogen evolution is inevitable during the oxidation of zirconium in high‐temperature water. A fraction of this evolved hydrogen diffuses into the cladding material, and the remaining is carried away by the reactor coolant. In this study, hydrogen evolution and corrosion behavior of zirconium‐702 in high‐temperature water are investigated using a continuous tubular flow‐through reactor. The results show that at a constant pressure of 25 MPa, the evolution of hydrogen gas from an oxidized zirconium reactor surface is approximately 24 times larger at 500°C than at 350°C. At higher temperatures, the zirconium reactor tubing exposed to water shows ballooning, with bending before the rupture near the exit end of the reactor tube, where the concentration of evolved hydrogen is the highest.

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On-line monitoring of oxide formation and dissolution on alloy 800H in supercritical water

Cited by 36 publications

References 30 publications

Oxidation model for construction materials in supercritical water—Estimation of kinetic and transport parameters

Oxidation model for construction materials in supercritical water—Estimation of kinetic and transport parameters

A Deformation Mechanism Map for Incoloy 800H Optimized Using the Genetic Algorithm

Hydrogen evolution and corrosion behavior of zirconium tubing in sub‐ and supercritical water

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