• Sanak Mishra

      Articles written in Bulletin of Materials Science

    • The unique features of textures in low-carbon steels

      Sanak Mishra

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      Textures in low-carbon steels are of great significance in view of their strong influence on important physical properties such as formability and magnetic induction. Recent studies on the formation and evolution of textures through different processing stages of hot rolling, cold rolling and annealing have brought out many unique features, e.g. presence of complete and almost ideal fibre axes, inheritance of texture, texture memory effect and parallels between single crystal and polycrystalline situations. In particular, it has been possible to develop a fairly cogent picture of the genesis and perpetuation of the Goss texture.

    • Some new results in thermomechanical processing of microalloyed steels

      Ramen Datta Sanak Mishra

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      In recent times, efforts have been directed towards a better understanding of the mechanisms associated with deformation and restoration of austenite during continuous multipass hot rolling of microalloyed steels. The correspondence between the condition of austenite before transformation and the resultant microstructure upon cooling holds the key to the attainment of interesting properties.

      In the present paper, some results obtained on the deformation of austenite in a microalloyed steel, using a hot compression machine, are presented. Here, the idea was to simulate actual plate rolling or hot strip rolling conditions and study the evolution of microstructure at different stages of the hot deformation process i.e. after precise reductions at given strain rate and temperature of deformation.

      The paper further discusses recent results obtained by us on the influence of hot deformation parameters (strain, finish rolling temperature, temperature of deformation) and cooling rates (air cooling, spray water cooling) on the microstructure of microalloyed steel. The precise conditions leading to the evolution of acicular ferrite and bainitic microstructures have been identified. New information on the influence of short tempering treatments (15 min at 550, 600 and 650°C) on the microstructure and properties of a microalloyed steel are also outlined.

    • On the formability of sheet steels

      S K Paul Sanak Mishra

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      Formability of sheet steel in stamping operation primarily depends on strain hardening exponent (n), average plastic strain ratio ($$\bar r$$) and the maximum strain the material can undergo before the onset of localized necking. The formability parameters (n and$$\bar r$$) and the forming limit diagrams have been evaluated for a variety of sheet steel products, extensively used for press forming of components of diverse shapes e.g. extra deep drawing quality auto-body sheets, high strength cold rolled sheets, LPG steel for gas cylinders, austenitic and ferritic stainless steels, etc. The effect of sulphide shape control on formability of hot rolled HSLA steel has also been studied. Additionally, the press performance of auto-body sheets and austenitic stainless steels have been monitored and evaluated at customer’s end for complete information on the formability.

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