Influence of δ-ferrite content on thermal aging induced mechanical property degradation in cast stainless steels

Thak Sang Byun; Timothy G. Lach; Ying Yang; Changheui Jang

doi:10.1007/978-3-030-04639-2_123

Influence of δ-ferrite content on thermal aging induced mechanical property degradation in cast stainless steels

Thak Sang Byun, Timothy G. Lach, Ying Yang, Changheui Jang

Microstructural Evolution Modeling

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

2 Scopus citations

Abstract

Thermal degradation of cast stainless steels was studied to provide an extensive knowledgebase for the assessment of structural integrity during extended operations of reactor coolant systems. The CF3 and CF8 series cast stainless steels with relatively low (5–12%) δ-ferrite contents were thermally aged at 290–400 °C for up to 10,000 h and tested to measure changes in tensile and impact properties. The aging treatments caused significant reduction of tensile ductility, but only slight softening or negligible strength change. The thermal aging also caused significant reduction of upper shelf energy and large shift of ductile-brittle transition temperature (ΔDBTT). The most influential factor in thermal degradation was ferrite content because of the major degradation mechanism occurring in the phase, while the nitrogen and carbon contents caused only weak effects. An integrated model is being developed to correlate the mechanical property changes with microstructural and compositional parameters.

Original language	English
Title of host publication	Minerals, Metals and Materials Series
Publisher	Springer International Publishing
Pages	1829-1840
Number of pages	12
ISBN (Print)	9783030046385, 9783030046392, 9783319515403, 9783319651354, 9783319728520, 9783319950211
DOIs	https://doi.org/10.1007/978-3-030-04639-2_123
State	Published - 2019
Event	18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors 2019 - Boston, United States Duration: Aug 18 2019 → Aug 22 2019

Publication series

Name	Minerals, Metals and Materials Series
ISSN (Print)	2367-1181
ISSN (Electronic)	2367-1696

Conference

Conference	18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors 2019
Country/Territory	United States
City	Boston
Period	08/18/19 → 08/22/19

Funding

This research was sponsored by U.S. Department of Energy/Office of Nuclear Energy through Light Water Reactor Sustainability R&D Program and International Nuclear Energy Research Initiative (I-NERI) Program. Pacific Northwest National Laboratory is operated by Battelle Memorial Institute for the U.S. Department of Energy under Contract No. DEAC05-76RL01830.

Keywords

Cast austenitic stainless steels
Mechanical properties
Thermal aging

Access to Document

10.1007/978-3-030-04639-2_123

Cite this

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title = "Influence of δ-ferrite content on thermal aging induced mechanical property degradation in cast stainless steels",

abstract = "Thermal degradation of cast stainless steels was studied to provide an extensive knowledgebase for the assessment of structural integrity during extended operations of reactor coolant systems. The CF3 and CF8 series cast stainless steels with relatively low (5–12%) δ-ferrite contents were thermally aged at 290–400 °C for up to 10,000 h and tested to measure changes in tensile and impact properties. The aging treatments caused significant reduction of tensile ductility, but only slight softening or negligible strength change. The thermal aging also caused significant reduction of upper shelf energy and large shift of ductile-brittle transition temperature (ΔDBTT). The most influential factor in thermal degradation was ferrite content because of the major degradation mechanism occurring in the phase, while the nitrogen and carbon contents caused only weak effects. An integrated model is being developed to correlate the mechanical property changes with microstructural and compositional parameters.",

keywords = "Cast austenitic stainless steels, Mechanical properties, Thermal aging",

author = "Byun, {Thak Sang} and Lach, {Timothy G.} and Ying Yang and Changheui Jang",

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year = "2019",

doi = "10.1007/978-3-030-04639-2_123",

language = "English",

isbn = "9783030046385",

series = "Minerals, Metals and Materials Series",

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}

Byun, TS , Lach, TG , Yang, Y & Jang, C 2019, Influence of δ-ferrite content on thermal aging induced mechanical property degradation in cast stainless steels. in Minerals, Metals and Materials Series. Minerals, Metals and Materials Series, Springer International Publishing, pp. 1829-1840, 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors 2019, Boston, United States, 08/18/19. https://doi.org/10.1007/978-3-030-04639-2_123

Influence of δ-ferrite content on thermal aging induced mechanical property degradation in cast stainless steels. / Byun, Thak Sang ; Lach, Timothy G.; Yang, Ying et al.
Minerals, Metals and Materials Series. Springer International Publishing, 2019. p. 1829-1840 (Minerals, Metals and Materials Series).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Influence of δ-ferrite content on thermal aging induced mechanical property degradation in cast stainless steels

AU - Byun, Thak Sang

AU - Lach, Timothy G.

AU - Yang, Ying

AU - Jang, Changheui

PY - 2019

Y1 - 2019

N2 - Thermal degradation of cast stainless steels was studied to provide an extensive knowledgebase for the assessment of structural integrity during extended operations of reactor coolant systems. The CF3 and CF8 series cast stainless steels with relatively low (5–12%) δ-ferrite contents were thermally aged at 290–400 °C for up to 10,000 h and tested to measure changes in tensile and impact properties. The aging treatments caused significant reduction of tensile ductility, but only slight softening or negligible strength change. The thermal aging also caused significant reduction of upper shelf energy and large shift of ductile-brittle transition temperature (ΔDBTT). The most influential factor in thermal degradation was ferrite content because of the major degradation mechanism occurring in the phase, while the nitrogen and carbon contents caused only weak effects. An integrated model is being developed to correlate the mechanical property changes with microstructural and compositional parameters.

AB - Thermal degradation of cast stainless steels was studied to provide an extensive knowledgebase for the assessment of structural integrity during extended operations of reactor coolant systems. The CF3 and CF8 series cast stainless steels with relatively low (5–12%) δ-ferrite contents were thermally aged at 290–400 °C for up to 10,000 h and tested to measure changes in tensile and impact properties. The aging treatments caused significant reduction of tensile ductility, but only slight softening or negligible strength change. The thermal aging also caused significant reduction of upper shelf energy and large shift of ductile-brittle transition temperature (ΔDBTT). The most influential factor in thermal degradation was ferrite content because of the major degradation mechanism occurring in the phase, while the nitrogen and carbon contents caused only weak effects. An integrated model is being developed to correlate the mechanical property changes with microstructural and compositional parameters.

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ER -

Influence of δ-ferrite content on thermal aging induced mechanical property degradation in cast stainless steels

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