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Title: Computational Thermodynamic Modeling of Hot Corrosion of Alloys Haynes 242 and Hastelloy TM N for Molten Salt Service in Advanced High Temperature Reactors

Abstract

An evaluation of thermodynamic aspects of hot corrosion of the superalloys Haynes 242 and HastelloyTM N in the eutectic mixtures of KF and ZrF4 is carried out for development of Advanced High Temperature Reactor (AHTR). This work models the behavior of several superalloys, potential candidates for the AHTR, using computational thermodynamics tool (ThermoCalc), leading to the development of thermodynamic description of the molten salt eutectic mixtures, and on that basis, mechanistic prediction of hot corrosion. The results from these studies indicated that the principal mechanism of hot corrosion was associated with chromium leaching for all of the superalloys described above. However, HastelloyTM N displayed the best hot corrosion performance. This was not surprising given it was developed originally to withstand the harsh conditions of molten salt environment. However, the results obtained in this study provided confidence in the employed methods of computational thermodynamics and could be further used for future alloy design efforts. Finally, several potential solutions to mitigate hot corrosion were proposed for further exploration, including coating development and controlled scaling of intermediate compounds in the KF-ZrF4 system.

Authors:
; ;
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1177210
Report Number(s):
INL/JOU-13-30754
Journal ID: ISSN 2325-9809
DOE Contract Number:  
AC07-05ID14517
Resource Type:
Journal Article
Journal Name:
Nuclear Energy Science & Power Generation Technology
Additional Journal Information:
Journal Volume: 03; Journal Issue: 03; Journal ID: ISSN 2325-9809
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; hastelloy N; Haynes 242; hot corrosion; molten salt; Secondary heat exchanger

Citation Formats

V. Glazoff, Michael, Charit, Indrajt, and Sabharwall, Piyush. Computational Thermodynamic Modeling of Hot Corrosion of Alloys Haynes 242 and HastelloyTM N for Molten Salt Service in Advanced High Temperature Reactors. United States: N. p., 2014. Web. doi:10.4172/2325-9809.1000125.
V. Glazoff, Michael, Charit, Indrajt, & Sabharwall, Piyush. Computational Thermodynamic Modeling of Hot Corrosion of Alloys Haynes 242 and HastelloyTM N for Molten Salt Service in Advanced High Temperature Reactors. United States. doi:10.4172/2325-9809.1000125.
V. Glazoff, Michael, Charit, Indrajt, and Sabharwall, Piyush. Wed . "Computational Thermodynamic Modeling of Hot Corrosion of Alloys Haynes 242 and HastelloyTM N for Molten Salt Service in Advanced High Temperature Reactors". United States. doi:10.4172/2325-9809.1000125. https://www.osti.gov/servlets/purl/1177210.
@article{osti_1177210,
title = {Computational Thermodynamic Modeling of Hot Corrosion of Alloys Haynes 242 and HastelloyTM N for Molten Salt Service in Advanced High Temperature Reactors},
author = {V. Glazoff, Michael and Charit, Indrajt and Sabharwall, Piyush},
abstractNote = {An evaluation of thermodynamic aspects of hot corrosion of the superalloys Haynes 242 and HastelloyTM N in the eutectic mixtures of KF and ZrF4 is carried out for development of Advanced High Temperature Reactor (AHTR). This work models the behavior of several superalloys, potential candidates for the AHTR, using computational thermodynamics tool (ThermoCalc), leading to the development of thermodynamic description of the molten salt eutectic mixtures, and on that basis, mechanistic prediction of hot corrosion. The results from these studies indicated that the principal mechanism of hot corrosion was associated with chromium leaching for all of the superalloys described above. However, HastelloyTM N displayed the best hot corrosion performance. This was not surprising given it was developed originally to withstand the harsh conditions of molten salt environment. However, the results obtained in this study provided confidence in the employed methods of computational thermodynamics and could be further used for future alloy design efforts. Finally, several potential solutions to mitigate hot corrosion were proposed for further exploration, including coating development and controlled scaling of intermediate compounds in the KF-ZrF4 system.},
doi = {10.4172/2325-9809.1000125},
journal = {Nuclear Energy Science & Power Generation Technology},
issn = {2325-9809},
number = 03,
volume = 03,
place = {United States},
year = {2014},
month = {9}
}