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Title: Aging degradation of cast stainless steel

Abstract

A program is being conducted to investigate the significance of in-service embrittlement of cast-duplex stainless steels under light-water reactor operating conditions. Data from room-temperature Charpy-impact tests for several heats of cast stainless steel aged up to 10,000 h at 350, 400, and 450/sup 0/C are presented and compared with results from other studies. Microstructures of cast-duplex stainless steels subjected to long-term aging either in the laboratory or in reactor service have been characterized. The results indicate that at least two processes contribute to the low-temperature embrittleent of duplex stainless steels, viz., weakening of the ferrite/austenite phase boundary by carbide precipitation and embrittlement of ferrite matrix by the formation of additional phases such as G-phase, Type X, or the ..cap alpha..' phase. Carbide precipitation has a significant effect on the onset of embrittlement of CF-8 and -8M grades of stainless steels aged at 400 or 450/sup 0/C. The existing correlations do not accurately represent the embrittlement behavior over the temperature range 300 to 450/sup 0/C. 18 refs., 13 figs.

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab., IL (USA)
OSTI Identifier:
6408052
Report Number(s):
CONF-8510173-25
ON: TI86003068
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 13. water reactor safety research information meeting, Gaithersburg, MD, USA, 22 Oct 1985
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; BWR TYPE REACTORS; REACTOR MATERIALS; PWR TYPE REACTORS; EMBRITTLEMENT; PHYSICAL RADIATION EFFECTS; STAINLESS STEELS; CHARPY TEST; GRAIN BOUNDARIES; HIGH TEMPERATURE; MATHEMATICAL MODELS; MECHANICAL PROPERTIES; PRECIPITATION; REACTOR OPERATION; REACTOR SAFETY; ALLOYS; CHROMIUM ALLOYS; CORROSION RESISTANT ALLOYS; CRYSTAL STRUCTURE; DESTRUCTIVE TESTING; IMPACT TESTS; IRON ALLOYS; IRON BASE ALLOYS; MATERIALS; MATERIALS TESTING; MECHANICAL TESTS; MICROSTRUCTURE; OPERATION; RADIATION EFFECTS; REACTORS; SAFETY; SEPARATION PROCESSES; STEELS; TESTING; WATER COOLED REACTORS; WATER MODERATED REACTORS; 360106* - Metals & Alloys- Radiation Effects; 360103 - Metals & Alloys- Mechanical Properties; 210100 - Power Reactors, Nonbreeding, Light-Water Moderated, Boiling Water Cooled; 210200 - Power Reactors, Nonbreeding, Light-Water Moderated, Nonboiling Water Cooled

Citation Formats

Chopra, O K, and Chung, H M. Aging degradation of cast stainless steel. United States: N. p., 1985. Web.
Chopra, O K, & Chung, H M. Aging degradation of cast stainless steel. United States.
Chopra, O K, and Chung, H M. 1985. "Aging degradation of cast stainless steel". United States. https://www.osti.gov/servlets/purl/6408052.
@article{osti_6408052,
title = {Aging degradation of cast stainless steel},
author = {Chopra, O K and Chung, H M},
abstractNote = {A program is being conducted to investigate the significance of in-service embrittlement of cast-duplex stainless steels under light-water reactor operating conditions. Data from room-temperature Charpy-impact tests for several heats of cast stainless steel aged up to 10,000 h at 350, 400, and 450/sup 0/C are presented and compared with results from other studies. Microstructures of cast-duplex stainless steels subjected to long-term aging either in the laboratory or in reactor service have been characterized. The results indicate that at least two processes contribute to the low-temperature embrittleent of duplex stainless steels, viz., weakening of the ferrite/austenite phase boundary by carbide precipitation and embrittlement of ferrite matrix by the formation of additional phases such as G-phase, Type X, or the ..cap alpha..' phase. Carbide precipitation has a significant effect on the onset of embrittlement of CF-8 and -8M grades of stainless steels aged at 400 or 450/sup 0/C. The existing correlations do not accurately represent the embrittlement behavior over the temperature range 300 to 450/sup 0/C. 18 refs., 13 figs.},
doi = {},
url = {https://www.osti.gov/biblio/6408052}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Oct 01 00:00:00 EDT 1985},
month = {Tue Oct 01 00:00:00 EDT 1985}
}

Conference:
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