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Phenomenon of strain hardening in sintered high carbon steel preforms during cold upsetting

Ananthanarayanan, Rajeshkannan and Prawin, PM.OSA. (2009) Phenomenon of strain hardening in sintered high carbon steel preforms during cold upsetting. UNSPECIFIED.

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      Abstract

      Present investigation pertains to evaluate strain hardening characteristics of Fe-0.8%C sintered preforms during cold upsetting. Preform density and deformation media were kept constant, however, two different heights to diameter ratio were considered for the analysis, which follows 0.40 and 0.75. The elemental powders were taken in a weight proportion to satisfy the composition considered, which were subjected to primary operations of powder metallurgy to get 86% initial density. The sintered preforms were further cold deformed in between the mirror polished flat dies under dry friction condition at a fixed step of loading till crack appears on the free surfaces of deforming preforms using hydraulic press of 1.0MN capacity. Experimental results revealed the fact that the variation of stresses with respect to the strain and/or density is of three different stages. The first and third stage established high resistance against deformation, however on the intermediate stage, dislocations of particles were found to be high, which enabled to get high densification. Further the study is concentrated to establish the strain hardening behaviour, which revealed that the lower heights to diameter ratio (0.40) is hardened at faster in the later stage as compared to its counter part.

      Item Type: Other
      Subjects: T Technology > TJ Mechanical engineering and machinery
      Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Engineering and Physics
      Depositing User: Rajeshkannan Ananthanarayanan
      Date Deposited: 02 May 2019 10:19
      Last Modified: 02 May 2019 10:19
      URI: http://repository.usp.ac.fj/id/eprint/11356
      UNSPECIFIED

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