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氧化物弥散强化钢(ODS钢)因其内部高密度的氧化物弥散颗粒而具有良好的抗高温蠕变特性和耐辐照性能，是目前核能系统关键候选材料。以铁粉与纳米Y2O3粉末混合而制备的金属型药芯丝材为原料，采用电弧熔丝增材制造(WAAM)技术成功制备了ODS钢，研究了成形工艺对试样尺寸特性和微观组织的影响。结果表明：由于电弧熔丝增材制造具有微熔池冶炼特性及快速凝固的特点，所制备的ODS钢基体的组织为晶粒尺寸均匀、平均晶粒尺寸在40μm以下的等轴晶组织，晶粒内部弥散分布着尺寸在100 nm以下的Y2O3颗粒。所制备的薄壁试样组织均匀性较好，硬度分布较为均匀，试样的拉伸强度为472 MPa,伸长率为37%。
Abstract：Oxide dispersion strengthened steel(ODS steel) has good high-temperature creep resistance and radiation resistance due to its high-density oxide dispersed particles. It is a key candidate material for nuclear power system. ODS steel was successfully prepared by wire arc additive manufacturing(WAAM) technology using metal mold core wire prepared by mixing iron powder and nano Y2O3 powder as raw materials. The effects of forming process on dimensional characteristics and microstructure of the sample were studied. The results show that due to the characteristics of micro bath smelting and rapid solidification of the WAAM, the microstructure of the ODS steel matrix is equiaxed structure with uniform grain size, and its average grain size is less than 40 μm, and the Y2O3 nanoparticles with a size of less than 100 nm are dispersed in the grain. The prepared thin-walled sample has good microstructure uniformity and uniform hardness distribution, and its tensile strength and elongation are 472 MPa and 37%, respectively.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2021-0537
中图分类号:TG142.1
引用信息:
[1]易果强,周亚举,张鹏等.电弧熔丝增材制造ODS钢的成型工艺及组织性能[J],2022,43(06):128-136.DOI:10.13289/j.issn.1009-6264.2021-0537.
基金信息:
国家重点基础研究发展计划(2018YFE0306104)