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

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
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

Fingerprint

Steel structures
Fracture toughness
Degradation
Hydrogen
Water
Light water reactors
Embrittlement
Coalescence
Fracture mechanics
Temperature
Yield stress
Macros
Aging of materials
Availability
Plastics
Mechanical properties
Microstructure
Air
Chemical analysis

Cite this

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 American Nuclear Society ANS.
Que, Zaiqing ; Seifert, Hans-Peter ; Spätig, Philippe ; Zhang, A. ; Holzer, J. ; Rao, G. S. ; Ritter, S. / Degradation Effects of Hydrogen and High-Temperature Water Environment on the Fracture Resistance of Low-Alloy RPV Steels. 19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors. American Nuclear Society ANS, 2019.
@inproceedings{2061a73d7f6c4c858edff7b26dc01887,
title = "Degradation Effects of Hydrogen and High-Temperature Water Environment on the Fracture Resistance of Low-Alloy RPV Steels",
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.",
author = "Zaiqing Que and Hans-Peter Seifert and Philippe Sp{\"a}tig and A. Zhang and J. Holzer and Rao, {G. S.} and S. Ritter",
year = "2019",
language = "English",
booktitle = "19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors",
publisher = "American Nuclear Society ANS",
address = "United States",

}

Que, Z, Seifert, H-P, Spätig, P, Zhang, A, Holzer, J, Rao, GS & 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. American Nuclear Society ANS, 19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, ENVDEG 2019, Boston, United States, 18/08/19.

Degradation Effects of Hydrogen and High-Temperature Water Environment on the Fracture Resistance of Low-Alloy RPV Steels. / Que, Zaiqing; Seifert, Hans-Peter; Spätig, Philippe; Zhang, A.; Holzer, J.; Rao, G. S.; Ritter, S.

19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors. American Nuclear Society ANS, 2019.

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

TY - GEN

T1 - Degradation Effects of Hydrogen and High-Temperature Water Environment on the Fracture Resistance of Low-Alloy RPV Steels

AU - Que, Zaiqing

AU - Seifert, Hans-Peter

AU - Spätig, Philippe

AU - Zhang, A.

AU - Holzer, J.

AU - Rao, G. S.

AU - Ritter, S.

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

M3 - Conference article in proceedings

BT - 19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors

PB - American Nuclear Society ANS

ER -

Que Z, Seifert H-P, Spätig P, Zhang A, Holzer J, Rao GS et al. 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. American Nuclear Society ANS. 2019