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从分析支撑裙等低合金铁素体钢辐照冲击试验数据看出,零塑性转变温度增量ΔTcv与中子积分通量Φ_f之间存在三段近似正比关系式:ΔT_(cv)=B~3Φ。式中Φ为名义通量,对三段不同的Φ_f(n/cm~2)范围取三个不同的值:即当Φ_f<1×10~(19),取Φ(n/cm~2)为Φ_f/10~(18);当Φ_f>3×10~(19),取Φ为Φ_f/3×10~(18);当Φ_f在1×10~(19)和3×10~(19)之间时,取Φ_f/1.5×10~(18)为Φ。B为钢种脆化系数,综合表征钢种的辐照敏感性。B是小于4的正值。B<2.3的钢种认为是辐照不敏感钢种。从脆化系数变化分析辐照敏感元素(Cu,P,Ni等)的影响。辐照前后冲击曲线上平台韧性值(A_k)及其变化,延伸率的改变也是判断辐照脆化的参数。用这些参数分析902钢尚有优越之处,此外从1.6×10~(18)n/cm~2 902(15 MnTi)的ΔT_(cv)(或B)?0数据说明902在本质上是辐照不敏感钢种。对现用安全标准进行了一些讨论。
From the analysis of the impact test data of low-alloyed ferritic steels such as support skirts, it can be seen that there are three proportional approximations between the zero plastic transition temperature increment ΔTcv and the neutron integral flux φ_f: ΔT_ (cv) = B ~ 3Φ. In the formula, Φ is the nominal flux, taking three different values for three different ranges of Φ_f (n / cm ~ 2): when Φ_f <1 × 10 ~ (19) and Φ (n / cm ~ 2) Is Φ_f / 10 ~ (18); when Φ_f> 3 × 10 ~ (19), Φ is taken as Φ_f / 3 × 10 ~ 18; when Φ_f is between 1 × 10 ~ 19 and 3 × 10 ~ 19 ), Φ_f / 1.5 × 10 ~ (18) is taken as Φ. B is the steel embrittlement coefficient, a comprehensive characterization of the radiation sensitivity of steel. B is a positive value less than 4. Steel grades of B <2.3 are considered as insensitive to irradiation. The influence of irradiation sensitive elements (Cu, P, Ni, etc.) Was analyzed from the change of embrittlement coefficient. The plateau toughness (A_k) and its variation on the impact curve before and after irradiation, and the change of elongation are also the parameters to judge the radiation embrittlement. Analysis of 902 steel using these parameters is further advantageous. In addition, ΔT_ (cv) (or B) ◦ 0 data from 1.6 × 10 ~ (18) n / cm ~ 2 902 (15 MnTi) According to insensitive steel. Some discussion of existing safety standards.