• J Marthanda Murthy

      Articles written in Bulletin of Materials Science

    • Development of an ultra-high-strength low-alloy NiSiCrCoMo steel

      G Malakondaiah M Srinivas J Marthanda Murthy Rama Rao P

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      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.

    • Effect of alloying additions onKISCC of ultrahigh strength NiSiCr steel

      S V Kamat G Malakondaiah M Srinivas J Marthanda Murthy P Rama Rao

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      The effect of alloying additions viz. cobalt, molybdenum, cerium and a combination of cobalt and molybdenum, on theKISCC of NiSiCr steel in 3·5% NaCl aqueous solution was studied. Addition of cobalt to NiSiCr steel resulted in an increase in theKISCC whereas molybdenum addition decreased theKISCC. Cerium addition did not affect theKISCC while the combination of cobalt and molybdenum resulted in an increase in theKISCC although not as much as in the case of cobalt addition. The effect of alloying elements onKISCC could be attributed to their effect on the critical fracture stress and yield strength.

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