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Title: The effect of thermal treatment on the fracture properties of alloy X-750 in aqueous environments

Abstract

Alloy X-750 is a high strength, age hardenable nickel-base alloy used in light water nuclear reactors. The excellent corrosion resistance and high temperature strength of alloy X-750 make it suitable for use in a variety of structure components in both pressurized water reactors and boiling water reactors. These applications involve exposure of highly stressed material to aqueous media. Operational stresses are subject to low frequency thermally induced fluctuations and high frequency flow induced fluctuations. In general, alloy X-750 has performed well in light water reactors. However, an economically significant number of components have failed unexpectedly due to localized forms of attack such as corrosion fatigue and stress corrosion cracking. Thermal processing history is known to play a significant role in the fracture properties of alloy X-750 in aqueous environments. While thermal treatments have been developed recently to improve performance, in many cases the reason for improved performance remains unclear. Therefore, identification of the mechanisms responsible for the degradation of fracture properties in aqueous environments is necessary. As a corollary it is necessary to achieve an understanding of how thermal treatment influences microstructure and, in turn, how microstructure influences fracture properties in aqueous environments. This report discusses five thermal treatments whichmore » were studied: (1) SA-1 hr at 1093{degree}C, (2) AH - 24 hr at 885{degree}C + 20 hr at 704{degree}C, (3) HTH - 1 hr at 1093{degree}C + 20 hr at 704{degree}C, (4) AHTH - 1 hr at 1093{degree}C + 24 hr at 885{degree}C + 20 hr at 704{degree}C, and (5) HOA - 1 hr at 1093{degree}C + 100 hrs at 760{degree}C. Microstructural characterization of these materials was accomplished through the use of optical microscopy, transmission electron microscopy,scanning transmission electron microscopy, energy dispersive x-ray spectroscopy, and x-ray diffractometry.« less

Authors:
; ; ;  [1]
  1. Massachusetts Inst. of Tech., Cambridge, MA (United States)
Publication Date:
Research Org.:
Electric Power Research Inst., Palo Alto, CA (United States); Massachusetts Inst. of Tech., Cambridge, MA (United States)
Sponsoring Org.:
Electric Power Research Inst., Palo Alto, CA (United States)
OSTI Identifier:
10172837
Report Number(s):
EPRI-TR-102437
ON: UN93016656; TRN: 93:016600
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: May 1993
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 36 MATERIALS SCIENCE; NICKEL BASE ALLOYS; FRACTURE PROPERTIES; HEAT TREATMENTS; WATER COOLED REACTORS; REACTOR COMPONENTS; MICROSTRUCTURE; EMBRITTLEMENT; CORROSION; AQUEOUS SOLUTIONS; GRAIN BOUNDARIES; TEMPERATURE DEPENDENCE; 220200; 360103; COMPONENTS AND ACCESSORIES; MECHANICAL PROPERTIES

Citation Formats

Ballinger, R, Elliott, C S, Hwang, I S, and Prybylowski, J. The effect of thermal treatment on the fracture properties of alloy X-750 in aqueous environments. United States: N. p., 1993. Web.
Ballinger, R, Elliott, C S, Hwang, I S, & Prybylowski, J. The effect of thermal treatment on the fracture properties of alloy X-750 in aqueous environments. United States.
Ballinger, R, Elliott, C S, Hwang, I S, and Prybylowski, J. Sat . "The effect of thermal treatment on the fracture properties of alloy X-750 in aqueous environments". United States.
@article{osti_10172837,
title = {The effect of thermal treatment on the fracture properties of alloy X-750 in aqueous environments},
author = {Ballinger, R and Elliott, C S and Hwang, I S and Prybylowski, J},
abstractNote = {Alloy X-750 is a high strength, age hardenable nickel-base alloy used in light water nuclear reactors. The excellent corrosion resistance and high temperature strength of alloy X-750 make it suitable for use in a variety of structure components in both pressurized water reactors and boiling water reactors. These applications involve exposure of highly stressed material to aqueous media. Operational stresses are subject to low frequency thermally induced fluctuations and high frequency flow induced fluctuations. In general, alloy X-750 has performed well in light water reactors. However, an economically significant number of components have failed unexpectedly due to localized forms of attack such as corrosion fatigue and stress corrosion cracking. Thermal processing history is known to play a significant role in the fracture properties of alloy X-750 in aqueous environments. While thermal treatments have been developed recently to improve performance, in many cases the reason for improved performance remains unclear. Therefore, identification of the mechanisms responsible for the degradation of fracture properties in aqueous environments is necessary. As a corollary it is necessary to achieve an understanding of how thermal treatment influences microstructure and, in turn, how microstructure influences fracture properties in aqueous environments. This report discusses five thermal treatments which were studied: (1) SA-1 hr at 1093{degree}C, (2) AH - 24 hr at 885{degree}C + 20 hr at 704{degree}C, (3) HTH - 1 hr at 1093{degree}C + 20 hr at 704{degree}C, (4) AHTH - 1 hr at 1093{degree}C + 24 hr at 885{degree}C + 20 hr at 704{degree}C, and (5) HOA - 1 hr at 1093{degree}C + 100 hrs at 760{degree}C. Microstructural characterization of these materials was accomplished through the use of optical microscopy, transmission electron microscopy,scanning transmission electron microscopy, energy dispersive x-ray spectroscopy, and x-ray diffractometry.},
doi = {},
url = {https://www.osti.gov/biblio/10172837}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {5}
}

Technical Report:
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