Degradation Effects of Hydrogen and High-Temperature Water Environment on the Fracture Resistance of Low-Alloy RPV Steels

Zaiqing Que, Hans-Peter Seifert, Philippe Spätig, A. Zhang, J. Holzer, G. S. Rao, S. Ritter

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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Abstract

The fracture behaviour of low-alloy reactor pressure vessel (RPV) steels with different microstructures, chemical compositions and mechanical properties in simulated light water reactor environments was evaluated by elastic plastic fracture mechanics tests. Moderate but clear environmental reduction of fracture initiation resistance occurred in RPV steels with high yield stress, high dynamic strain aging (DSA), environmentallyassisted cracking (EAC) and temper embrittlement (TE) susceptibilities. Failure occurred dominantly by stable ductile transgranular tearing with micro-void coalescence in both air and high-temperature water environments. Additional and varying amounts (a few %) of secondary cracking, macro-voids, quasi-cleavage and intergranular cracking were observed in hightemperature water environments. The environmental reduction of fracture resistance is due to hydrogen and the main reason for the moderate degradation effects is the low hydrogen availability in high-temperature water.
Original languageEnglish
Title of host publication19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors
PublisherAmerican Nuclear Society ANS
Number of pages16
Editioncd-rom
ISBN (Electronic)978-0-89448-765-1
Publication statusPublished - 2019
MoE publication typeA4 Article in a conference publication
Event19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, EnvDeg 2019 - Boston, United States
Duration: 18 Aug 201922 Aug 2019

Conference

Conference19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, EnvDeg 2019
Abbreviated titleENVDEG 2019
CountryUnited States
CityBoston
Period18/08/1922/08/19

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    Que, Z., Seifert, H-P., Spätig, P., Zhang, A., Holzer, J., Rao, G. S., & Ritter, S. (2019). Degradation Effects of Hydrogen and High-Temperature Water Environment on the Fracture Resistance of Low-Alloy RPV Steels. In 19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors (cd-rom ed.). American Nuclear Society ANS.