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<p>Aluminum-forming austenitic stainless (AFA) steel is a kind of promising cladding material for advanced nuclear energy systems. To further improve its high-temperature strength and irradiation resistance, a new type of oxide dispersion strengthened (ODS) AFA steel was prepared by mechanical alloying (MA), hot isostatic pressing (HIP), and forging, followed by aging at different conditions. The microstructure and mechanical properties of the ODS-AFA steel were systematically characterized using transmission electron microscopy (TEM) equipped with an energy dispersive spectroscopy (EDS) and electronic universal testing equipment. The effect of aging conditions on the microstructure and mechanical properties of the ODS-AFA steel was investigated. The composition of the dispersed oxide particles in the sample is Y<sub>4</sub>Zr<sub>3</sub>O<sub>12</sub>, and its number density is 10<sup>21</sup>-10<sup>23</sup>&#xa0;m<sup>−3</sup>. These oxide dispersoids are quite stable after high-temperature aging. The tensile properties of ODS-AFA steel are significantly better than those of traditional AFA steels due to the dispersion strengthening effect of oxide particles. Substantial precipitation of B2-NiAl and Laves phases occurs at 700 °C, which results in a further increase in yield and tensile strength. The sample obtained the best strength-ductility matching aged at 700 °C for 120&#xa0;h. Its tensile strength was 1012.94&#xa0;MPa with a high elongation of 31.5%.</p>

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Effect of Different Aging Conditions on Microstructure and Mechanical Properties of an ODS-AFA Steel

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • Chenxin Yin,
  • Lu Han,
  • Yingjie Wang,
  • Haochen Guan,
  • Lingzhi Chen,
  • Zhangjian Zhou

摘要

Aluminum-forming austenitic stainless (AFA) steel is a kind of promising cladding material for advanced nuclear energy systems. To further improve its high-temperature strength and irradiation resistance, a new type of oxide dispersion strengthened (ODS) AFA steel was prepared by mechanical alloying (MA), hot isostatic pressing (HIP), and forging, followed by aging at different conditions. The microstructure and mechanical properties of the ODS-AFA steel were systematically characterized using transmission electron microscopy (TEM) equipped with an energy dispersive spectroscopy (EDS) and electronic universal testing equipment. The effect of aging conditions on the microstructure and mechanical properties of the ODS-AFA steel was investigated. The composition of the dispersed oxide particles in the sample is Y4Zr3O12, and its number density is 1021-1023 m−3. These oxide dispersoids are quite stable after high-temperature aging. The tensile properties of ODS-AFA steel are significantly better than those of traditional AFA steels due to the dispersion strengthening effect of oxide particles. Substantial precipitation of B2-NiAl and Laves phases occurs at 700 °C, which results in a further increase in yield and tensile strength. The sample obtained the best strength-ductility matching aged at 700 °C for 120 h. Its tensile strength was 1012.94 MPa with a high elongation of 31.5%.