Hf对铁素体钢中辐照引起的晶间偏析的影响

THE ROLE OF Hf IN RADIATION-INDUCED INTERGRANULAR SEGREGATION IN FERRITIC STEEL

1％Hf(质量分数)被注入E911钢中．利用250 keV的Ni离子在300℃辐照含Hf和不含Hf的E911钢,以研究Hf的添加对铁素体/马氏体钢中由辐照引起的偏析的影响．结果表明,Hf的添加抑制了晶界上P原子的富集和Cr原子的贫化．讨论和评估了Hf对自由迁移的缺陷数量的影响,结合一个辐照引起的非平衡偏析(RIS)模型以预测Hf对P,Cr等元素的晶界偏析行为的作用．对预测结果和实验数据作了比较．

1% （mass fraction） oversized atom Hf was implanted in ferritic steel E911. E911 and E911＋Hf steels were irradiated by 250 keV nickel-ions at 300 ℃ to study the influence of Hf additions on radiation-induced segregation behaviour in ferritic/martensitic steels. It was found that the addition of Hf suppresses radiation-induced phosphorus enrichment and Cr depletion at grain boundary. The effect of Hf on freely migrating defect population is estimated and combined with a radiation-induced non-equilibrium segregation model to predict P and Cr atom segregation behaviours at the grain boundary in ferritic steels. The predicted results are compared with experimental data.