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A comprehensive study of the effects of long-term thermal aging on the fracture resistance of cast austenitic stainless steels

David A. Collins|Emily L. Carter|Timothy G. Lach|Thak Sang Byun
한국원자력학회 (Korean Nuclear Society)|2022.02|Nuclear Engineering and Technology|제54권 제2호|pp. 709-731|DOI https://doi.org/10.1016/j.net.2021.08.022

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키워드

Centrifugal castingFracture toughnessThermal agingCast austenitic stainless steelAging degradationMolybdenum content
주제분류원자력공학

초록

Loss of fracture resistance due to thermal aging degradation is a potential limiting factor affecting thelong-term (80þ year) viability of nuclear reactors. To evaluate the effects of decades of aging in apractical time frame, accelerated aging must be employed prior to mechanical characterization. In thisstudy, a variety of chemically and microstructurally diverse austenitic stainless steels were aged between0 and 30,000 h at 290e400 C to simulate 0e80þ years of operation. Over 600 static fracture tests werecarried out between room temperature and 400 C. The results presented include selected J-R curves ofeach material as well as K0.2mm fracture toughness values mapped against aging condition and ferritecontent in order to display any trends related to those variables. Results regarding differences in processing, optimal ferrite content under light aging, and the relationship between test temperature and Mocontent were observed. Overall, it was found that both the ferrite volume fraction and molybdenumcontent had significant effects on thermal degradation susceptibility. It was determined that materialswith >25 vol% ferrite are unlikely to be viable for 80 years, particularly if they have high Mo contents(>2 wt%), while materials less than 15 vol% ferrite are viable regardless of Mo content.

Abstract

Loss of fracture resistance due to thermal aging degradation is a potential limiting factor affecting thelong-term (80þ year) viability of nuclear reactors. To evaluate the effects of decades of aging in apractical time frame, accelerated aging must be employed prior to mechanical characterization. In thisstudy, a variety of chemically and microstructurally diverse austenitic stainless steels were aged between0 and 30,000 h at 290e400 C to simulate 0e80þ years of operation. Over 600 static fracture tests werecarried out between room temperature and 400 C. The results presented include selected J-R curves ofeach material as well as K0.2mm fracture toughness values mapped against aging condition and ferritecontent in order to display any trends related to those variables. Results regarding differences in processing, optimal ferrite content under light aging, and the relationship between test temperature and Mocontent were observed. Overall, it was found that both the ferrite volume fraction and molybdenumcontent had significant effects on thermal degradation susceptibility. It was determined that materialswith >25 vol% ferrite are unlikely to be viable for 80 years, particularly if they have high Mo contents(>2 wt%), while materials less than 15 vol% ferrite are viable regardless of Mo content.

참고문헌 (57)

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