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首页> 外文会议>International Conference on Environmental Degradation of Materials in Nuclear Power Systems >Correlation between IASCC Growth Behavior and Plastic Zone Size of Crack Tip in 3.5 dpa Neutron Irradiated Type 304L SS CT Specimen
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Correlation between IASCC Growth Behavior and Plastic Zone Size of Crack Tip in 3.5 dpa Neutron Irradiated Type 304L SS CT Specimen

机译：3.5 DPA中子辐照型304LSSCT标本裂纹尖端裂纹尖端增长行为与塑料区尺寸的相关性

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摘要

To evaluate the validity of the stress intensity factor K, crack growth rate (CGR) testing was conducted using a 0.5T-CT specimen made of type 304L stainless steel (SS) irradiated to 2.5×10{sup}25 n/m{sup}2 (3.5 dpa) in simulated boiling water reactor (BWR) environment. The CGRs were evaluated under constant load conditions where the stress intensity factor K increased from 23 to 35 MPa√m. The size of the plastic zone, r{sub}p, was evaluated on the basis of microstructure and hardness distribution around the crack tip region. The K was also evaluated using FEM analysis, adopting the stress-strain curve of the test material. The crack growth behavior was relatively stable even after K exceeded its upper limit based on small scale yielding condition with effective proof stress σ{sub}(ys-eff) for irradiated material. The estimated size of the plastic zone, r{sub}p, was around 0.2-0.4 mm for K=30 MPa√m, and this size is small enough in comparison with the ligament size (W-a) to satisfy the small scale yielding conditions.
机译：为了评估应力强度因子k的有效性，使用由304L不锈钢（SS）制成的0.5T-CT标本进行裂纹生长速率（CGR）测试，其照射到2.5×10 {SUP} 25 n / m {sup模拟沸水反应器（BWR）环境中的2（3.5DPA）。在恒定的载荷条件下评估CGR，其中应力强度因子K从23升至35mPa√m。基于裂纹尖端区域周围的微观结构和硬度分布评估塑料区R {Sub} P的尺寸。还使用有限元分析评估k，采用测试材料的应力 - 应变曲线。即使在K超过其上限基于具有用于照射材料的有效证明应力σ{}（YS-EFF）的小规模的小规模均匀的上限，裂纹生长行为也相对稳定。塑料区的估计尺寸R {sub} p为k =30mpa√m约0.2-0.4mm，与韧带尺寸（wa）相比，这种尺寸足够小，以满足小规模的条件。

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