16Cr-ODS铁素体钢的初始氧化物弥散相结构对抗辐照硬化和Ne离子脆化性能的作用研究

依托兰州重离子研究装置(HIRFL)，开展了3 种不同氧化物弥散强化的16Cr-ODS铁素体钢的重离子辐照损伤研究，旨在探究氧化物颗粒结构参数(尺寸和密度)对材料辐照硬化和Ne离子辐照脆化效应的影响。采用6.17 MeV/u的Ni离子辐照和Ne离子，借助辐照终端的梯度减能装置在材料样品中产生了均匀的辐照损伤坪区。借助纳米压痕和小冲杆测试技术分别获得了辐照前后材料的纳米硬度和延伸率数据。探究了氧化物纳米颗粒的界面对于缺陷的的吸收尾闾(sink strength)和材料的辐照硬化/脆化的关系。结果表明，吸收尾闾越大，ODS钢的抗辐照硬化和脆化能力越强。

The Effect of Initial Microstructure of the Oxides on Irradiation Hardening/Embrittlement Behavior of 16Cr-ODS Steel

The irradiation hardening and embrittlement behavior of three kinds of Oxide Dispersion Strengthened(ODS) steel (MA956, 16Cr-4Al, 16Cr-0.1Ti) are investigated by using the HIRFL(Heavy Ion Research Facility in Lanzhou). The main motivation is to find the relation between diameter and density of the oxides and irradiation hardening/embrittlement behavior of different ODS steels. These three kind of materials are irradiated by Ne and Ni ions, and get a uniform damage layer by using the energy degrader. The Nano-hardness and elongation of the materials are obtained by Nano-indentation and small punch test. The sink strength was calculated with the mean diameter and density of the materials. Then followed by nano-indentation test and small punch test to get the irradiation hardening and ductility loss. Results show that irradiation resistance of the materials rise with sink strength(S) increasing.