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      https://www.ias.ac.in/article/fulltext/boms/017/01/0073-0086

    • Keywords

       

      Ultra-high-strength steels; fracture toughness; maraging steel; tempered martensite embrittlement; segregation

    • Abstract

       

      An ultra-high-strength low-alloy NiSiCrCoMo steel has been developed. The development work is part of a major programme at the Defence Metallurgical Research Laboratory in the field of ultra-high-strength, high-fracture-toughness steels. In this context we undertook investigations to understand the effect of solute additions on the fracture behaviour of Armco iron and Fe-C alloys. We investigated Fe-Ni, Fe-Co, Fe-Si, Fe-Mo, Fe-C-Ni and Fe-C-Co alloys for mechanical behaviour. The report by Garrison (1986) on a Fe-C-Ni-Si-Cr alloy was an important pointer to a low-alloy, ultra-high-strength steel with high fracture toughness. The material we have now arrived at is a Fe-C-Ni-Si-Cr-Co-Mo steel with tensile, impact and fracture toughness properties matching those of maraging steel 250 grade in tonnage scale melts.

    • Author Affiliations

       

      G Malakondaiah1 M Srinivas1 J Marthanda Murthy1 Rama Rao P1 2

      1. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad - 500 258, India
      2. Jawaharlal Nehru Centre for Advanced Scientific Research, IISc Campus, Bangalore - 560 012, India
    • Dates

       
  • Bulletin of Materials Science | News

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