Grain boundary segregation in neutron-irradiated 304 stainless steel studied by atom probe tomography
Grain boundary segregation in neutron-irradiated 304 stainless steel studied by atom probe tomography
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DOI：
10.1016/j.jnucmat.2011.11.072
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发表时间：
2012-06
影响因子：
3.1
通讯作者：
T. Toyama;Y. Nozawa;W. Renterghem;Y. Matsukawa;M. Hatakeyama;Y. Nagai;A. A. Mazouzi-A.;S. Dyck
中科院分区：
文献类型：
--
作者：
T. Toyama;Y. Nozawa;W. Renterghem;Y. Matsukawa;M. Hatakeyama;Y. Nagai;A. A. Mazouzi-A.;S. Dyck
利用激光辅助原子探针层析成像（APT）技术研究了304不锈钢（SS）在300°C、24 dpa剂量中子辐照下的晶界溶质原子偏聚现象。GB中Ni、Si和P的富集以及Cr和Fe的贫化是明显的。Ni和Si的浓度分布峰的RIS区的半峰全宽为1.3nm。GB中Ni、Si和Cr的原子百分比分别为0.19%、0.77%和0.14%，与先前报道的中子辐照SS的值一致。在基体中形成高数量密度的晶内富Ni-Si析出相。晶界两侧出现宽约10 nm的析出-剥蚀带。
Radiation-induced segregation (RIS) of solute atoms at a grain boundary (GB) in 304 stainless steel (SS), neutron-irradiated to a dose of 24dpa at 300°C in the fuel wrapper plates of a commercial pressurized water reactor, was investigated using laser-assisted atom probe tomography (APT). Ni, Si, and P enrichment and Cr and Fe depletion at the GB were evident. The full-width at half-maximum of the RIS region was ∼3nm for the concentration profile peaks of Ni and Si. The atomic percentages of Ni, Si, and Cr at the GB were ∼19%, ∼7%, and ∼14%, respectively, in agreement with previously-reported values for neutron-irradiated SS. A high number density of intra-granular Ni–Si rich precipitates formed in the matrix. A precipitate-denuded zone with a width of ∼10nm appeared on both sides of the GB.