The addition of Zr can hardly transform all Y2O3 into fine Y-Zr-O dispersoids in the ODS steels, and the residual large Y2O3 and ZrO2 deteriorate the mechanical properties. Hereof, Y4Zr3O12 nanoparticles (NPs) were successfully prepared by stearic acid sol-gel method and directly added in the Fe-15Cr-2W-0.35Ti ODS steels. The effects of Y4Zr3O12 addition on the microstructure and mechanical properties of the ODS steels were systematically characterized. The mean particle size and number density of oxide NPs in the Fe-15Cr-2W-0.35Ti-0.6Y4Zr3O12 steel were 7.9±2.9 nm and 1.4×1023 m−3, showing a narrower size distribution than the Fe-15Cr-2W-0.5Ti-0.35Y2O3 steel. Both Y2Ti2O7 in Fe-15Cr-2W-0.5Ti-0.35Y2O3 and Y4Zr3O12 in Fe-15Cr-2W-0.35Ti-0.6Y4Zr3O12 shared the coherent interface with the ferrite matrix, ($15\overline{1}$)Y2Ti2O7//($\overline{1}\overline{1}0$)α-Fe and (303)Y4Zr3O12//(110)α-Fe, with lattice misfit of 3.99% and 1.66%. As respect to the mechanical properties, substituting Y₂O₃ with Y₄Zr₃O₁₂ did not apparently vary the strength of the ODS steel, but did effectively improve the uniform elongation from 12.2% to 15.5%. The improvement of ductility was attributable not only to the formation of homogeneous oxide NPs but also to the strong bonding force of the coherent interface in the Fe-15Cr-2W-0.35Ti-0.6Y4Zr3O12 steel. With the increasing Y4Zr3O12 content from 0.6 to 1.8 wt.%, the tensile strength of the ODS steels increased from 1006 MPa to 1168 MPa, and the plastic deformation capacity still maintained a relatively high uniform elongation of 7.2%. Our work demonstrates a new way to obtain homogeneous oxide dispersoids in the ODS steels and improve the mechanical properties.

Zr的添加几乎不能将所有的Y2O3转变成ODS钢中的细Y-Zr-O弥散体，残留的大Y2O3和ZrO2会降低机械性能。本文通过硬脂酸溶胶-凝胶法成功制备了Y4Zr3O12纳米颗粒（NPs），并将其直接添加到Fe-15Cr-2W-0.35Ti ODS钢中。系统地表征了Y4Zr3O12的添加对ODS钢组织和力学性能的影响。Fe-15Cr-2W-0.35Ti-0.6Y4Zr3O12钢中氧化物NP的平均粒径和数量密度为7.9±2.9 nm和1.4×1023 m-3，显示出比Fe-15Cr-2W-窄的尺寸分布0.5Ti-0.35Y2O3钢。Fe-15Cr-2W-0.5Ti-0.35Y2O3中的Y2Ti2O7和Fe-15Cr-2W-0.35Ti-0.6Y4Zr3O12中的Y4Zr3O12与铁氧体基体共享相干界面，（$15\overline{\mathrm{1个}}$Y2Ti2O7 //（$\overline{\mathrm{1个}}\overline{\mathrm{1个}}0$）α-Fe和（303）Y4Zr3O12 //（110）α-Fe，晶格失配分别为3.99％和1.66％。关于机械性能，用Y ₄ Zr ₃ O ₁₂代替Y ₂ O ₃。不会明显改变ODS钢的强度，但确实将均匀伸长率从12.2％提高到15.5％。延展性的提高不仅归因于均匀氧化物NP的形成，而且归因于Fe-15Cr-2W-0.35Ti-0.6Y4Zr3O12钢中相干界面的强结合力。随着Y4Zr3O12含量从0.6到1.8 wt。％的增加，ODS钢的抗拉强度从1006 MPa增加到1168 MPa，塑性变形能力仍然保持了7.2％的相对较高的均匀伸长率。我们的工作演示了一种在ODS钢中获得均质氧化物弥散体并改善机械性能的新方法。