Effect of He on 12Cr-ODS Ferritic Steel Structural Damage during（He++e-） Dual-Beam Irradiation
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摘要: 利用氦离子(He+)束和电子(e-)束双束同时辐照化学溶胶法制备的新型12Cr-ODS铁素体钢。实验结果表明,辐照初期,随着辐照剂量增加,点缺陷团(黑斑)在基体内形成,密度不断增大,尺寸长大缓慢,辐照剂量为0.8 dpa时形成间隙型位错环。不同试验温度下,辐照均产生小尺寸高密度的空洞,随着辐照剂量增加,空洞尺寸长大缓慢,空洞密度降低也缓慢,辐照剂量达15 dpa时,空洞肿胀均小于0.05%,表明12Cr-ODS铁素体钢具有良好抗辐照损伤性。Abstract: The 12Cr-ODS ferritic steel made by the method of sol-gel was prepared and effect of the interaction between point defects and He on the void swelling was studied by（He++e-） dual-beam irradiation.At the initial stage of irradiation,a lot of point defect clusters（dark dots） were nucleated.They grew slowly and their number density increased with irradiation dose and the clusters developed to interstitial loop.Also,fine void with high density were formed at different temperature and the void size increased slowly and the number density decreased slowly too with the increasing of irradiation dose.The resultant void swelling at each temperature after 15dPa were less than 0.05%.Thus this 12Cr-ODS ferritic steel showed excellent swelling resistance.The effect of interaction of point defect and He on the behavior of void swelling has been explained by the theory of irradiation damage in the present work.
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Key words:
- Irradiation damage /
- Oxide dispersion strengthened steel /
- Void swelling
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