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Microstructure and mechanical behavior of neutron irradiated ultrafine grained ferritic steel

机译:中子辐照超细晶粒铁素体钢的组织和力学性能

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摘要

Neutron irradiation effects on ultra-fine grain (UFG) low carbon steel prepared by equal channel angular pressing (ECAP) have been examined. Counterpart samples with conventional grain (CG) sizes have been irradiated alongside with the UFG ones for comparison. Samples were irradiated in the Advanced Test Reactor (ATR) at Idaho National Laboratory (INL) to 1.37 dpa. Atom probe tomography revealed manganese and silicon-enriched clusters in both UFG and CG steel after neutron irradiation. Mechanical properties were characterized using microhardness and tensile tests, and irradiation of UFG carbon steel revealed minute radiation effects in contrast to the distinct radiation hardening and reduction of ductility in its CG counterpart. After irradiation, micro hardness indicated increases of around 9% for UFG versus 62% for CG steel. Similarly, tensile strength revealed increases of 8% and 94% respectively for UFG and CG steels while corresponding decreases in ductility were 56% versus 82%. X-ray quantitative analysis showed that dislocation density in CG increased after irradiation while no significant change was observed in UFG steel, revealing better radiation tolerance. Quantitative correlations between experimental results and modeling were demonstrated based on irradiation induced precipitate strengthening and dislocation forest hardening mechanisms.
机译:已经研究了中子辐照对通过等通道角挤压(ECAP)制备的超细晶粒(UFG)低碳钢的影响。与常规颗粒(CG)尺寸对应的样品已与UFG样品一起进行了辐照以进行比较。在爱达荷州国家实验室(INL)的高级测试反应器(ATR)中将样品辐照至1.37 dpa。原子探针断层扫描显示中子辐照后,UFG和CG钢中锰和硅富集簇。机械性能通过显微硬度和拉伸测试进行表征,UFG碳钢的辐射显示出细微的辐射效应,而CG对应物则具有明显的辐射硬化和延展性降低。辐射后,UFG的显微硬度增加了约9%,而CG钢增加了62%。同样,UFG和CG钢的抗拉强度分别提高了8%和94%,而延展性相应降低了56%和82%。 X射线定量分析表明,辐照后CG中的位错密度增加,而UFG钢中未观察到显着变化,显示出更好的辐射耐受性。基于辐照引起的沉淀强化和位错森林硬化机制,证明了实验结果与模型之间的定量相关性。

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