Alloy 600의 결정립계 산화에 대한 표면 변형의 영향
Effects of Surface Deformation on Intergranular Oxidation of Alloy 600
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초록
Immersion tests of Alloy 600 were conducted in simulated primary water environments of a pressurizedwater reactor at 325 °C for 10, 100, and 1000 h to obtain insight into effects of surface deformation oninternal and intergranular (IG) oxidation behavior through precise characterization using various microscopicequipment. Oxidized samples after immersion tests were covered with polyhedral and filamentous oxides. It was found that oxides were abundant in mechanically ground (MG) samples the most. The number densityof surface oxides increased with time irrespective of the method of surface finish. IG oxidation occurredin mechanically polished (MP) and chemically polished (CP) samples with thin internal oxidation layers. However, IG oxidation was suppressed with relatively thick internal oxidation layers in MG samples comparedto MP and CP samples, suggesting that MG treatment could increase resistance to primary water stresscorrosion cracking (PWSCC) from the standpoint of IG oxidation. As a result, appropriate surface treatmentfor Alloy 600 could prevent oxygen diffusion into grain boundaries, inhibit IG oxidation, and finally induceits high PWSCC resistance.
Abstract
Immersion tests of Alloy 600 were conducted in simulated primary water environments of a pressurizedwater reactor at 325 °C for 10, 100, and 1000 h to obtain insight into effects of surface deformation oninternal and intergranular (IG) oxidation behavior through precise characterization using various microscopicequipment. Oxidized samples after immersion tests were covered with polyhedral and filamentous oxides. It was found that oxides were abundant in mechanically ground (MG) samples the most. The number densityof surface oxides increased with time irrespective of the method of surface finish. IG oxidation occurredin mechanically polished (MP) and chemically polished (CP) samples with thin internal oxidation layers. However, IG oxidation was suppressed with relatively thick internal oxidation layers in MG samples comparedto MP and CP samples, suggesting that MG treatment could increase resistance to primary water stresscorrosion cracking (PWSCC) from the standpoint of IG oxidation. As a result, appropriate surface treatmentfor Alloy 600 could prevent oxygen diffusion into grain boundaries, inhibit IG oxidation, and finally induceits high PWSCC resistance.
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