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Experimental and theoretical analysis of equilibrium segregation and radiation-induced segregation of Cr at grain boundaries in a reduced activation ferritic/martensitic (RAFM) steel
Journal of Iron and Steel Research International ( IF 2.5 ) Pub Date : 2020-09-10 , DOI: 10.1007/s42243-020-00484-z
Li-dong Xia , Hao Chen , Zhi-gang Yang , Chi Zhang

Helium ion irradiation at 350 °C was performed to study equilibrium segregation and radiation-induced segregation (RIS) of Cr at grain boundaries in reduced activation ferritic/martensitic steels. Cr concentration at grain boundary was measured by scanning transmission electron microscopy with an energy-dispersive spectrometer. The measured Cr concentration at grain boundaries in heat treated zone was 11.7 and 12.8 wt.% in irradiated zone, respectively, which matched well to the calculated results from Mclean and modified Perk model. Equilibrium segregation and RIS of Cr mechanisms were theoretically analysed. The analysis indicates that as temperature rises, equilibrium Cr segregation decreases monotonically, while RIS of Cr has a bell-shape profile, which increases first and then decreases. It is also shown that at low and high temperatures, equilibrium segregation of Cr is higher than that of RIS; at intermediate temperatures, equilibrium Cr segregation is lower than RIS.



中文翻译:

还原活化铁素体/马氏体(RAFM)钢中晶界处Cr的平衡偏析和辐射诱导偏析的实验和理论分析

进行了350°C的氦离子辐照,以研究还原活化铁素体/马氏体钢中Cr在晶界的平衡偏析和辐射诱导偏析(RIS)。用能谱仪通过扫描透射电子显微镜测量晶界处的Cr浓度。在辐照区中,热处理区晶界处测得的Cr浓度分别为11.7和12.8 wt。%,与Mclean和改进的Perk模型的计算结果非常吻合。从理论上分析了Cr机理的平衡偏析和RIS。分析表明,随着温度升高,Cr的平衡偏析单调减少,而RIS的RIS具有钟形轮廓,先上升然后下降。还表明,在低温和高温下,Cr的平衡偏析高于RIS。在中间温度下,平衡Cr偏析低于RIS。

更新日期:2020-09-10
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