Effects of implanted hydrogen on fatigue behavior of F82H under irradiation
Effects of implanted hydrogen on fatigue behavior of F82H under irradiation
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DOI：
10.1016/j.jnucmat.2010.12.049
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发表时间：
2011-10
影响因子：
3.1
通讯作者：
Y. Murase;J. Nagakawa;N. Yamamoto
中科院分区：
文献类型：
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作者：
Y. Murase;J. Nagakawa;N. Yamamoto
在17 MeV质子辐照下，对F82H钢进行了60℃的原位应力控制疲劳试验，能量降解剂将注氢率从2.6×10−6提高到1.3×10−3appm/S，剂量率为1.1×10−7dpa/S.未加能量降解剂辐照的疲劳断裂循环数约为未辐照条件下的2倍，而有降解剂辐照的则仅略有增加(1.2倍).含降解剂和不含降解剂的原位辐照疲劳试件的断口表面形貌相似。一种改进的断口表面形貌分析技术(FRASTA)显示，在降解剂的照射下，裂纹快速扩展。大量注入的氢通过辐射诱导的缺陷簇和运动位错之间的相互作用，在减少辐射对疲劳行为的影响方面起到了作用。
In situ stress-controlled fatigue tests were performed for F82H steels under 17MeV proton irradiation with an energy degrader at 60°C. The energy degrader enhanced the hydrogen implantation rate from 2.6×10−6to 1.3×10−3appm/s at a dose rate of 1.1×10−7dpa/s. Although number of fatigue cycles to fracture (NF) under irradiation without the degrader increased to about 2 times NFfor the unirradiated condition, only a slight increase of NF(1.2 times) was detected for the irradiation with the degrader. The surface morphology of the fracture surfaces was similar for both in situ irradiation fatigue specimens with and without the degrader. A modified technique of fractographic surface topography analysis (FRASTA) demonstrated rapid crack propagation under irradiation with the degrader. Substantial levels of implanted hydrogen play a role in reducing the effect of irradiation on fatigue behavior based on the interaction between radiation-induced defect clusters and moving dislocations.