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Title: Effects of Thermal Aging on the Fracture Toughness of Cast Stainless Steel CF8

Abstract

Cast stainless steels are widely used in the primary coolant systems of nuclear power plants because of their high strength, toughness, and corrosion resistance. Mechanical property degradation in the steels, primarily due to a thermally-embrittled ferrite, is of major concern in an extended-term operation. To investigate the aging-induced loss of fracture resistance in cast stainless steels, static fracture resistance (J-R) testing was performed for three different CF8 cast stainless steels with significantly different d-ferrite contents. The materials were thermally-aged at 290-400°C for up to 10kh and fracture-tested at 25-400°C. It was found that the fracture toughness in high-ferrite materials generally decreased with thermal aging while the relationship between aging and fracture toughness in low-ferrite materials was rather complicated, showing non-monotonic variation with the degree of aging. While significant degradation was observed for the highly-aged high-ferrite materials, no material was observed having a K0.2mm less than 100 MPavm.

Authors:
 [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. BATTELLE (PACIFIC NW LAB)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1545023
Report Number(s):
PNNL-SA-140141
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
International Journal of Pressure Vessels and Piping
Additional Journal Information:
Journal Volume: 173
Country of Publication:
United States
Language:
English

Citation Formats

Collins, David A., Barkley, Emily L., Lach, Timothy G., and Byun, Thak Sang. Effects of Thermal Aging on the Fracture Toughness of Cast Stainless Steel CF8. United States: N. p., 2019. Web. doi:10.1016/j.ijpvp.2019.04.017.
Collins, David A., Barkley, Emily L., Lach, Timothy G., & Byun, Thak Sang. Effects of Thermal Aging on the Fracture Toughness of Cast Stainless Steel CF8. United States. doi:10.1016/j.ijpvp.2019.04.017.
Collins, David A., Barkley, Emily L., Lach, Timothy G., and Byun, Thak Sang. Sat . "Effects of Thermal Aging on the Fracture Toughness of Cast Stainless Steel CF8". United States. doi:10.1016/j.ijpvp.2019.04.017.
@article{osti_1545023,
title = {Effects of Thermal Aging on the Fracture Toughness of Cast Stainless Steel CF8},
author = {Collins, David A. and Barkley, Emily L. and Lach, Timothy G. and Byun, Thak Sang},
abstractNote = {Cast stainless steels are widely used in the primary coolant systems of nuclear power plants because of their high strength, toughness, and corrosion resistance. Mechanical property degradation in the steels, primarily due to a thermally-embrittled ferrite, is of major concern in an extended-term operation. To investigate the aging-induced loss of fracture resistance in cast stainless steels, static fracture resistance (J-R) testing was performed for three different CF8 cast stainless steels with significantly different d-ferrite contents. The materials were thermally-aged at 290-400°C for up to 10kh and fracture-tested at 25-400°C. It was found that the fracture toughness in high-ferrite materials generally decreased with thermal aging while the relationship between aging and fracture toughness in low-ferrite materials was rather complicated, showing non-monotonic variation with the degree of aging. While significant degradation was observed for the highly-aged high-ferrite materials, no material was observed having a K0.2mm less than 100 MPavm.},
doi = {10.1016/j.ijpvp.2019.04.017},
journal = {International Journal of Pressure Vessels and Piping},
number = ,
volume = 173,
place = {United States},
year = {2019},
month = {6}
}