Atom probe tomography has characterised the microstructural changes in T91 steel after BOR60 reactor irradiation at five temperatures between 376 °C and 524 °C to doses between 14.6 dpa and 35.1 dpa. Irradiation-induced precipitation and segregation to carbide/matrix interface induced by neutron irradiation has been characterised. Atom probe tomography characterisation shows that Mn, Ni, Si -rich (MNS-rich) clusters form in T91 steel irradiated in BOR60 reactor at temperatures between 376 °C and 415 °C, which is not observed at higher temperatures 460 °C and 524 °C. The number density, volume fraction and composition of MNS-rich clusters have been characterised. Ni, Mn, Si and P is found to segregate at carbide matrix interface after irradiation at lower temperature and only P segregation is observed at 524 °C.

原子探针层析成像已表征了BOR60反应堆在376°C至524°C的五个温度下辐照至14.6 dpa至35.1 dpa的剂量后，T91钢的显微组织变化。已经表征了辐照引起的中子辐照引起的沉淀和偏析到碳化物/基质界面。原子探针层析成像特征表明，在376°C和415°C之间的温度下，在BOR60反应器中辐照的T91钢中形成了Mn，Ni，Si富集（富MNS）的团簇，而在460°C和524较高的温度下则观察不到℃。MNS富集簇的数量密度，体积分数和组成已被表征。发现在较低温度下照射后，Ni，Mn，Si和P在碳化物基体界面偏析，在524°C下仅观察到P偏析。