• The role of active elements in Fe-Cr-Al alloys for heating element applications

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      https://www.ias.ac.in/article/fulltext/boms/018/03/0207-0221

    • Keywords

       

      Ferritic stainless steel; heating element; active element; ductile brittle transition temperature; grain growth; fracture mode

    • Abstract

       

      The role of active elements (zirconium, cerium and yttrium) in grain growth and its subsequent effect on room-temperature tensile fracture behaviour of Fe-Cr-Al alloys has been investigated. The alloys containing active elements exhibited improved resistance to grain growth. Yttrium-containing alloy retained higher room-temperature tensile ductility even after heating at higher temperatures because of its superior resistance to grain coarsening. All the alloys, with and without active elements, exhibited a sudden drop in room-temperature tensile ductility, with concommitant change in fracture mode from dimple rupture to cleavage, in a narrow band of 39–44µm grain size. The ductile-brittle transition temperatures (DBTT) of these alloys were found to be 150°C and 215°C for grain sizes 25µm and 100µm respectively. The accelerated life test showed that the alloys containing active elements exhibited longer lives.

    • Author Affiliations

       

      D V Satyanarayana1 M C Pandey1

      1. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad - 500 258, India
    • Dates

       
  • Bulletin of Materials Science | News

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