2017
DOI: 10.1007/s11661-016-3898-4
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Accelerated Stress Corrosion Crack Initiation of Alloys 600 and 690 in Hydrogenated Supercritical Water

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Cited by 47 publications
(8 citation statements)
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“…At distances beyond 500 µm from the crack tip, the density and size of any observed cavity was much smaller than those in the vicinity of the crack tip. These observations are consistent with the recent results obtained from the long-term IGSCC testing under constant load by the other research groups [6,7,14] , while different from the results obtained from the short-term IGSCC testing under dynamic strain/stress [8,9,35,[37][38][39][40] , in which the IGSCC is attributed to the classic theory of rupture of intergranular oxides by the dynamic stress/strain. The observation of IGSCC cracking under the constant load and high density intergranular nanocavities in front of the crack tip in this study and in literature [6,14] suggests that a fundamentally different IGSCC mechanism in CW Alloy 690 may be operating.…”
Section: Discussionsupporting
confidence: 89%
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“…At distances beyond 500 µm from the crack tip, the density and size of any observed cavity was much smaller than those in the vicinity of the crack tip. These observations are consistent with the recent results obtained from the long-term IGSCC testing under constant load by the other research groups [6,7,14] , while different from the results obtained from the short-term IGSCC testing under dynamic strain/stress [8,9,35,[37][38][39][40] , in which the IGSCC is attributed to the classic theory of rupture of intergranular oxides by the dynamic stress/strain. The observation of IGSCC cracking under the constant load and high density intergranular nanocavities in front of the crack tip in this study and in literature [6,14] suggests that a fundamentally different IGSCC mechanism in CW Alloy 690 may be operating.…”
Section: Discussionsupporting
confidence: 89%
“…Compared with conventional "shorter" term accelerated testing under dynamic strain/stress [8,9,[34][35][36][37][38][39][40] , the mechanism controlling the "longer" term IGSCC crack growth of CW Alloy 690 under constant load is likely to be different. The present study has shown the occurrence of IGSCC crack growth and unequivocally demonstrated the formation of intergranular cavities in the region near the IGSCC crack.…”
Section: Discussionmentioning
confidence: 99%
“…Approach.-The thermodynamic equivalence was considered for the three different environments described in the previous sections, namely: (i) elevated temperature hydrogenated water, 1,45,46 (ii) supercritical hydrogenated water 29,30,47,48 and (iii) hydrogenated steam. [9][10][11][12][15][16][17][18]28,[32][33][34][35]44 Since the thermodynamic correlations are based on the calculation of the EcP, it is worthwhile to recall how the EcP is predicted in PWR primary water and in the other environments.…”
Section: Typical Experimental Conditionsmentioning
confidence: 99%
“…Nowadays, accelerated tests are often conducted in supercritical [29][30][31] and superheated H 2 -steam [9][10][11][12]15,16,28,[32][33][34][35] environments. Despite the fact that these two systems have been widely used to perform oxidation and SCC experiments relevant to simulated PWR primary water environments, they are not considered to be equivalent to PWR conditions; moreover, it is still not clear if the supercritical environment affects the oxidation and PWSCC processes on Ni-base alloys.…”
mentioning
confidence: 99%
“…Миграция границ зерен происходила, когда растворенные элементы (такие как Cr и Fe) были избирательно окислены. В работе [19] [25][26][27][28], таким образом происходит диффу зионная миграция границ зерен. Обогащение Cr пассивной пленки может быть неоднородным на наноразмерном уровне и варьироваться в зависи мости от оксидных нанозерен, составляющих барьерный слой пассивной пленки [4].…”
Section: механизмы разрушения пассивностиunclassified