Fe-Cr-Mn奥氏体合金的辐照体胀与诱起晶界偏析行为的研究SCIEI

本文采用电子束辐照,研究了Fe-15Cr-xMn合金以及添加W,V合金的孔洞体胀和诱起晶界偏析行为,并对包含晶界在内的辐照区进行成分分析。结果表明,在Fe-Cr-Mn系合金中孔洞体胀孕育期可以被强烈抑制,晶界偏析也减少。特别是,合金中添加W,V效果更加明显。用Mn代替Ni,通常要发生体胀和相的不稳定性,由于反Kirkendall效应导致Ni和Mn的扩散行为不同,使Fe富集在尾闾处,局部地区形成铁素体,有利于减少体胀和晶界偏析。

BEHAVIOR OF VOID SWELLING AND RADIATION-INDUCED SEGREGATION IN Fe-Cr-Mn ALLOY SYSTEM UNDER ELECTRON IRRADIATION

The behavior of void swelling and segregation in Fe-15Cr-xMn alloysand alloy coataining small amount of W and V was investigated by electron-irradiation. The compositional analysis in the irradiated regions including grainboundaries was performed. The results show that there are many common featuresof irradiation behavior in the Fe-Cr-Mn and Fe-Cr-Ni systems while there are somesignificant differences. In the Fe-Cr-Mn alloy systems void swelling was remarka-bly suppressed and at the same time the radiation-induced segregation was also re-tarded, furthermore, the segregation was strongly retarded in Fe-15Cr-15Mn alloycontaining small amount of W and V. The results also show that Ni replaced byMn does not in general confer immunity from either swelling or phase instabilities.The phase instability is due to the different diffusion behavior of Ni and Mn inresponse to the operation of the inverse-Kirkendall effect. Fe segregates to the mi-crostructural sinks in the Fe-Cr-Mn alloys. The segregation of Fe often leads tothe formation of ferrite. This fact is beneficial to reduce the swelling rate andsegregation on the grain boundaries.