Advanced microstructural characterization of the intergranular oxidation of Alloy 600
Advanced microstructural characterization of the intergranular oxidation of Alloy 600
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DOI：
10.1016/j.corsci.2015.08.010
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发表时间：
2015-11
影响因子：
8.3
通讯作者：
G. Bertali;F. Scenini;M. G. Burke
中科院分区：
文献类型：
--
作者：
G. Bertali;F. Scenini;M. G. Burke
在模拟压水堆一次水暴露的氢化蒸汽环境中，对固溶态600合金进行了氧化处理。FIB和分析电子显微镜表征，结合详细的扫描电子显微镜分析，提供了局域晶界迁移和晶间氧化物渗透的明确证据。这些局部化的迁移与明显的铬和铁的贫化有关，突出了晶界对铬在晶间氧化中扩散的作用。这些发现与晶间氧化的早期阶段、扩散诱导的晶界迁移以及随后的应力腐蚀开裂有关。
Oxidation of solution-annealed Alloy 600 has been performed in a hydrogenated steam environment, which is considered to simulate PWR primary water exposure. FIB and analytical TEM characterization, coupled with detailed SEM analyses, provided unequivocal evidence of localized grain boundary migration and intergranular oxide penetrations. These localized migrations were associated with pronounced Cr and Fe depletions, highlighting the role of the grain boundaries for Cr diffusion for intergranular oxidation. These findings are discussed in relation to the early stages of intergranular oxidation, diffusion-induced grain boundary migration and subsequent SCC initiation.