The Effect of Grain Boundary Structure on the Intergranular Degradation Behavior of Solution Annealed Alloy 690 in Simulated Pressurized Water Reactor Primary Environment

2019 ◽  
Author(s):  
Wenjun Kuang ◽  
Gary S. Was
Keyword(s):  
Grain Boundary ◽  
Boundary Structure ◽  
Degradation Behavior ◽  
Pressurized Water Reactor ◽  
Annealed Alloy ◽  
Pressurized Water ◽  
Water Reactor ◽  
Grain Boundary Structure ◽  
Alloy 690

The response of alloy 690 tubing in a pressurized water reactor environment

2007 ◽  
Vol 28 (2) ◽  
pp. 373-379 ◽  
Author(s):  
B.A. Young ◽  
Xiaosheng Gao ◽  
T.S. Srivatsan ◽  
Peter J. King
Keyword(s):  
Pressurized Water Reactor ◽  
Pressurized Water ◽  
Water Reactor ◽  
Alloy 690

Corrosion Mechanisms of Ni-Base Alloys in Pressurized Water Reactor Primary Conditions

2008 ◽  
Vol 595-598 ◽  
pp. 529-537 ◽  
Author(s):  
Loïc Marchetti ◽  
Stéphane Perrin ◽  
Olivier Raquet ◽  
Michèle Pijolat
Keyword(s):  
Film Formation ◽  
Oxidation Mechanism ◽  
Passive Layer ◽  
Pressurized Water Reactor ◽  
Primary Coolant ◽  
Pressurized Water ◽  
Water Reactor ◽  
Boundary Diffusion Coefficient ◽  
Alloy 690 ◽  
Corrosion Mechanisms

Oxidation mechanism of Alloy 690 has been investigated in Pressurised Water Reactor (PWR) primary coolant conditions (325°C, aqueous hydrogenated media). Experiments performed with gold marker and RBS technique reveal that the passive film formation is the consequence of an anionic mechanism. This result is confirmed by experiments achieved with two sequences of corrosion in a H2 16O media and in a mixed H2 16O/ H2 18O media. The localisation of 18O by SIMS analysis in the thin passive layer underlines an oxidation mechanism due to oxygen diffusion by short circuits (like grain boundaries) in the oxide scale. Moreover grain boundary diffusion coefficient in chromite like oxide was estimated to be in the range 2 10-18 – 1 10-17 cm2.s-1 and compared to values extrapolated from higher temperature.

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