新型抗辐照氧化物弥散强化（ODS）型铁素体不锈钢辐照损伤特性研究

BEHAVIOUR OF RESISTANCE TO IRRADIATED DAMAGE IN A NOVEL OXIDE DISPERSION STRENGTHENED FERRITIC STEEL(ODS STEEL)

研制了一种具有低肿胀高强度的氧化物弥散强化（ＯＤＳ）型铁素体钢Ｆｅ－Ｃｒ－Ｗ－Ｔｉ－Ｙ_２Ｏ_３，并对其抗辐照损伤行为进行了系统研究。电子辐照结果表明，Ｙ_２Ｏ_３弥散氧化物质点在所研究的辐照条件下是稳定的，在辐照过程中形成ｂ＝ａ〈１００〉和ｂ＝ａ／２〈１１１〉两种类型的位错环。在６７３Ｋ，当辐照剂量从５增至１７．５ｄｐａ时，空洞肿胀由０．１％增至０．３５％。在辐照区内没有明显的溶质原子（如Ｃｒ，Ｗ和Ｔｉ）在晶界偏析。

A kind of oxide dispersion strengthened(ODS) ferritic steel Fe-Cr-W-Ti-Y_2O_3 with low swelling and high strength properties has been developed and its behaviour and characteristic of the irradiation damage have been systematically studied.Results of electron irradiation indicate that Y_2O_3 dispersed oxide particles were stable under these irradiation conditions.During irradiation,two kinds of dislocation loops with b=a〈100〉-type and b=a/2〈111〉-type formed.At 673 K as the dose increasing from 5 to 17.5dpa,the void swelling increased from 0.1% to 0.35%.In the irradiated region there were not significant concentration changes of the solute atoms such as Cr,W and Ti near grain boundacy.