Radiation-induced segregation and corrosion behavior on Σ3 coincidence site lattice and random grain boundaries in proton-irradiated type-316L austenitic stainless steel
Radiation-induced segregation and corrosion behavior on Σ3 coincidence site lattice and random grain boundaries in proton-irradiated type-316L austenitic stainless steel
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DOI：
10.1016/j.jnucmat.2012.11.036
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发表时间：
2013-03
影响因子：
3.1
通讯作者：
N. Sakaguchi;M. Endo;Seiichi Watanabe;H. Kinoshita;S. Yamashita;H. Kokawa
中科院分区：
文献类型：
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作者：
N. Sakaguchi;M. Endo;Seiichi Watanabe;H. Kinoshita;S. Yamashita;H. Kokawa
研究了质子辐照 316L 不锈钢中随机晶界和 Σ3 重合点晶格 (CSL) 边界处的辐射诱导偏析 (RIS) 和晶间腐蚀行为。通过辐照前的晶界工程处理，CSL 晶界的频率提高了 86.6%。由于 RIS，在随机晶界处引起了显着的镍富集和铬贫化。在多面Σ3 CSL边界处，在不对称边界面平面处发生铬贫化，而在相干孪晶边界处没有观察到RIS。电化学蚀刻测试后，由于晶界处铬浓度较低（~12%），沿随机晶界发现了晶间腐蚀槽。在多面 Σ3 CSL 边界处，沿非对称小面平面的不连续凹槽被非腐蚀性共格孪晶边界完全破坏。
The behavior of radiation-induced segregation (RIS) and intergranular corrosion at random grain boundaries and Σ3 coincidence site lattice (CSL) boundaries in proton-irradiated 316L stainless steel was examined. The frequency of the CSL boundaries was enhanced up to 86.6% by grain boundary engineering treatment prior to irradiation. Significant nickel enrichment and chromium depletion were induced at the random grain boundary owing to the RIS. At faceted Σ3 CSL boundaries, chromium depletion occurred at the asymmetrical boundary facet plane whereas no RIS was observed at the coherent twin boundary. After the electrochemical etching test, an intergranular corrosion groove was found along the random grain boundaries because of the low chromium concentration (∼12%) at the boundaries. At the faceted Σ3 CSL boundaries, the discontinuous groove along the asymmetric facet plane was completely disrupted by the non-corrosive coherent twin boundary.