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.
|Title of host publication||19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors|
|Publisher||American Nuclear Society ANS|
|Number of pages||16|
|Publication status||Published - 2019|
|MoE publication type||A4 Article in a conference publication|
|Event||19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, EnvDeg 2019 - Boston, United States|
Duration: 18 Aug 2019 → 22 Aug 2019
|Conference||19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, EnvDeg 2019|
|Abbreviated title||ENVDEG 2019|
|Period||18/08/19 → 22/08/19|
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.