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<p>The phase relationships, microstructures, microhardness and cyclic oxidation behavior of as-cast and aged Fe-10Ti-nCr (<i>n</i> = 4, 7, and 10 at.% ) alloys were analyzed. The alloys were prepared using the vacuum arc-melting technique and subjected to solution treatment at 1000&#xa0;°C for 1&#xa0;h and aging at 800&#xa0;°C for 8, 16, and 24&#xa0;h. The microstructure of the studied as-cast and aged specimens was composed of an <i>α</i>-Fe (ferrite) matrix phase and an Fe<sub>2</sub>Ti Laves phase. The size and amount of the Fe<sub>2</sub>Ti Laves phase increased gradually with increasing aging time. Microhardness values had an increasing tendency with increasing aging time and Cr content. The highest microhardness was observed as 309 ± 8 HV for the 16&#xa0;h aged Fe-10Ti-10Cr alloy. For all compositions and conditions, the surface oxide was <i>α</i>-Fe<sub>2</sub>O<sub>3</sub>. Important scale spallation was observed for as-cast specimens, whereas no important scale spallation was observed at all. For both as-cast and 24&#xa0;h aged specimens, the weight gain decreased with increasing Cr content.</p>

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Effect of Cr Concentration on the Structural Properties, Hardness and Oxidation Behavior of Fe-Cr-Ti Ferritic Alloys

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Sayid Has,
  • Mehmet Sahin Atas,
  • Mehmet Yildirim

摘要

The phase relationships, microstructures, microhardness and cyclic oxidation behavior of as-cast and aged Fe-10Ti-nCr (n = 4, 7, and 10 at.% ) alloys were analyzed. The alloys were prepared using the vacuum arc-melting technique and subjected to solution treatment at 1000 °C for 1 h and aging at 800 °C for 8, 16, and 24 h. The microstructure of the studied as-cast and aged specimens was composed of an α-Fe (ferrite) matrix phase and an Fe2Ti Laves phase. The size and amount of the Fe2Ti Laves phase increased gradually with increasing aging time. Microhardness values had an increasing tendency with increasing aging time and Cr content. The highest microhardness was observed as 309 ± 8 HV for the 16 h aged Fe-10Ti-10Cr alloy. For all compositions and conditions, the surface oxide was α-Fe2O3. Important scale spallation was observed for as-cast specimens, whereas no important scale spallation was observed at all. For both as-cast and 24 h aged specimens, the weight gain decreased with increasing Cr content.