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<p>The present study systematically investigated the influence of Si content on the microstructure and mechanical properties of Fe-9Cr-1.1W-0.5Mn-0.3V-0.14Ta-0.1C-0.06N-χSi alloys with Si levels of χ = 0, 0.25, 0.50, and 1.00 wt.%. The specimens were hot rolled, normalized at 1150&#xa0;°C for 1&#xa0;h, and tempered at 850&#xa0;°C for 0.5&#xa0;h to ensure consistent mechanical properties. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were performed to characterize the alloys and to reveal the microstructural evolution associated with varying Si content. Si additions modified the microstructure, mechanical properties, and precipitate morphology of the alloys. The experimental results demonstrated that, with increasing Si content, both the matrix microstructure and the precipitate size changed systematically, and the yield strength (YS) increased from 459 to 713&#xa0;MPa. The alloy containing 1 wt.% Si exhibited the most favorable mechanical properties, with a YS of 713&#xa0;MPa, an ultimate tensile strength (UTS) of 935&#xa0;MPa, and a total elongation (TE) of 19%. With increasing Si content, YS and UTS increased by 55.33 and 48.89%, respectively, whereas TE decreased by 53%. These findings indicated that low-activation steels with enhanced properties could be promising candidates for structural blanket materials in nuclear fusion reactors.</p>

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Effects of Si Content on the Microstructure and Mechanical Properties of Low-Activation Steel

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Zhaolan An,
  • Fei Wang,
  • Baoru Sun,
  • Tongde Shen

摘要

The present study systematically investigated the influence of Si content on the microstructure and mechanical properties of Fe-9Cr-1.1W-0.5Mn-0.3V-0.14Ta-0.1C-0.06N-χSi alloys with Si levels of χ = 0, 0.25, 0.50, and 1.00 wt.%. The specimens were hot rolled, normalized at 1150 °C for 1 h, and tempered at 850 °C for 0.5 h to ensure consistent mechanical properties. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were performed to characterize the alloys and to reveal the microstructural evolution associated with varying Si content. Si additions modified the microstructure, mechanical properties, and precipitate morphology of the alloys. The experimental results demonstrated that, with increasing Si content, both the matrix microstructure and the precipitate size changed systematically, and the yield strength (YS) increased from 459 to 713 MPa. The alloy containing 1 wt.% Si exhibited the most favorable mechanical properties, with a YS of 713 MPa, an ultimate tensile strength (UTS) of 935 MPa, and a total elongation (TE) of 19%. With increasing Si content, YS and UTS increased by 55.33 and 48.89%, respectively, whereas TE decreased by 53%. These findings indicated that low-activation steels with enhanced properties could be promising candidates for structural blanket materials in nuclear fusion reactors.