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首页> 外文会议>The 3rd International Symposium on Material Chemistry in Nuclear Environment (Material Chemistry '02 MC'02) Mar 13-15, 2002 Tsukuba >Characterization of SCC Crack Tip in Alloy 600 in Simulated Primary Water of PWR
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Characterization of SCC Crack Tip in Alloy 600 in Simulated Primary Water of PWR

机译：压水堆模拟一次水中600合金中SCC裂纹尖端的表征

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摘要

High-resolution observations on microstructure of SCC crack tips were carried out on alloy 600 exposed to a simulated PWR primary water environment. A focused-ion beam (FIB) micro-processing has been applied to prepare electron transparent foils for cross-sectional observations of the crack tips. Cr rich oxides ((Cr,Fe)_3O_4 and Cr_2O_3) and a metallic Ni phase were identified at the crack tip and along the grain boundary ahead of the crack tip. Oxide layers on the crack walls were identified as a double layer structure. The inner layer consisted of Cr rich oxides and the outer layer consisted of NiO. Similar microstructure was observed in cross sections of surface oxide layers that were prepared by using the same FIB technique. The inner layer consisted of Cr rich oxides and a metallic Ni phase and was covered by the outer layer of NiFe_2O_4 and NiO. In addition, Cr rich oxides were observed along uncracked grain boundaries intercepted by the surface. It is suggested that selective oxidation of chromium occurs at the crack tips, grain boundaries and inner layers. The observations of oxygen penetration along the grain boundaries support a larger diffusivity of oxygen in the stressed grain boundary than that in the unstressed one.
机译：对暴露于模拟压水堆初级水环境的合金600进行了SCC裂纹尖端微观结构的高分辨率观察。聚焦离子束（FIB）微处理已用于制备电子透明箔，以用于裂纹尖端的横截面观察。在裂纹尖端和裂纹尖端之前的晶界处发现了富Cr氧化物（（Cr，Fe）_3O_4和Cr_2O_3）和金属Ni相。裂纹壁上的氧化物层被确定为双层结构。内层由富铬氧化物组成，外层由NiO组成。在通过使用相同的FIB技术制备的表面氧化物层的横截面中观察到相似的微观结构。内层由富Cr氧化物和金属Ni相组成，并被NiFe_2O_4和NiO的外层覆盖。此外，沿表面截获的未开裂的晶界观察到富铬氧化物。建议在裂纹尖端，晶界和内层发生铬的选择性氧化。沿着晶界的氧气渗透的观察结果表明，在受应力的晶界中，氧气的扩散率要比未受应力的晶界中的更大。

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