Effect of thermal aging on the deformation and failure behaviors of cast austenitic stainless steels under excessive cyclic loads

Jin Weon Kim, Sang Eon Kim, Yun Jae Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study conducts failure tests using a simulated specimen to investigate the effect of thermal aging on the deformation and failure behaviors of system, structure, and components (SSCs) of nuclear power plants (NPPs) made of cast austenitic stainless steels (CASSs) under excessive seismic loads. Both unaged and thermally aged CF8A CASSs were used for the experiment, and the large cyclic loads in the form of displacement-control and load-control were applied at a quasi-static displacement rate. Displacement-controlled tests were performed at room temperature (RT) and 316oC and load-controlled tests were performed at RT. The results show that the deformation behaviors of aged CF8A CASS under both types of cyclic load are almost the same as those of unaged CF8A CASS. The thermal aging slightly promotes the failure of CF8A CASS under displacement-controlled cyclic loads, but the failure of specimen still occurs under the cyclic load levels several times higher than the load of the design basis earthquake. Under load-controlled cyclic loads, thermal aging retards the failure of CF8A CASS. Consequently, the thermal aging has no apparent negative effect on the deformation and failure behaviors of CASSs under large cyclic loads, even if it considerably changes the strength, ductility, and fracture toughness of CASSs.

Original languageEnglish
Title of host publicationDesign and Analysis
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791858943
DOIs
Publication statusPublished - 2019 Jan 1
Externally publishedYes
EventASME 2019 Pressure Vessels and Piping Conference, PVP 2019 - San Antonio, United States
Duration: 2019 Jul 142019 Jul 19

Publication series

NameAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume3
ISSN (Print)0277-027X

Conference

ConferenceASME 2019 Pressure Vessels and Piping Conference, PVP 2019
CountryUnited States
CitySan Antonio
Period19/7/1419/7/19

ASJC Scopus subject areas

  • Mechanical Engineering

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  • Cite this

    Kim, J. W., Kim, S. E., & Kim, Y. J. (2019). Effect of thermal aging on the deformation and failure behaviors of cast austenitic stainless steels under excessive cyclic loads. In Design and Analysis (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 3). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/PVP2019-93969