• Malur N Srinivasan

      Articles written in Bulletin of Materials Science

    • Studies on a wear-resistant cast iron

      N Ranganathan Malur N Srinivasan N Raman

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      The possibility of developing a good wear-resistant cast iron with manganese and chromium as alloying elements in white cast iron was explored. The results indicate that it is possible, but the composition of the alloy in respect of manganese and chromium should be controlled within close limits to achieve the desired objective.

    • Computation and application of local solidification times of grey cast iron cast in metallic moulds

      Malur N Srinivasan

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      Heat conduction equations applicable to the solidification of grey cast iron cast in moulds of the same material were solved for the cases of plate and cylindrical shaped castings made by pouring the metal at different temperatures into moulds of different wall thicknesses preheated to different temperatures, when the heat transfer coefficient at the casting-mould interface was assumed to have different values. An explicit finite difference method was used to solve the equations with the aid of a digital computer. Local solidification times at different nodal points were determined from the solutions and a relationship between the local solidification time and the location in a ‘casting’ was established. The application of local solidification times for predicting the microstructure and estimating the ultimate tensile strength of these “castings” cast in metallic moulds has been demonstrated.

    • Scanning electron microscopic fractography of permanent moulded cast iron

      S Seetharamu Malur N Srinivasan

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      The fracture susceptibility of chill-free permanent moulded cast iron is discussed in terms of graphite configuration. The details of fracture surface topography as revealed by scanning electron microscope examination on areas of slow crack growth and fast fracture are presented and the usefulness of these SEM fractographs in categorizing the fracture modes is demonstrated.

    • Fracture toughness of cast aluminium alloys

      S Ranganatha Malur N Srinivasan

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      An investigation was carried out to evaluate the fracture toughness of cast aluminium alloys of different microstructural complexity, brought about by alloy constitution and cooling rate of castings. In all cases the three-point bend specimens, which had a thickness of 15 mm, did not provide valid plane — strain stress intensity factor values. The fracture susceptibility at a given stress level reckoned in terms of the conditional plane strain stress intensity factor (KQ) was found to be lowest in aluminium-4.5% copper alloy castings and the susceptibility increased with increase in microstructural complexity. Casting cooling rate in these castings is likely to affect the damage potential of a given defect at yield stress to a greater extent than the fracture susceptibility at a given stress.

    • Flow stress of an aluminium alloy in the warm working range

      S K Pachisia S K Ramalingam Malur N Srinivasan

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      The effect of temperature and processing history on the flow stress of a two-phase aluminium (Al-6% Cu) alloy was investigated. The flow stress was determined from the changes in dimensions of flat, ring-shaped specimens using Avitzur’s upper bound theorem. The results indicate that the flow stress increases with the degree of deformation irrespective of the specimen history considered and this tendency is in general more pronounced at large deformations. The flow stress of this alloy at large deformation is considerably lower at 573 K than at the lower temperatures tested. The morphology and distribution of the second phase particles of this alloy changed considerably depending upon the processing history, temperature and deformation.

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