Atomic migration of carbon in hard turned layers of carburized bearing steel

Vikram Bedekar, Jonathan D. Poplawsky, Wei Guo, Rajiv Shivpuri, R. Scott Hyde

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Grain finement and non-equilibrium carbon segregation within grain boundaries alters the mechanical performance of hard turning layers in carburized bearing steel. An atom probe tomography (APT) study on the nanostructured hard turning layers reveals carbon migration to grain boundaries as a result of carbide decomposition during severe plastic deformation. In addition, samples exposed to different cutting speeds show that the carbon migration rate increases with the cutting speed. These two effects lead to an ultrafine carbon network structure resulting in increased hardness and thermal stability in the severely deformed surface layer.

Original languageEnglish
Pages (from-to)85-88
Number of pages4
JournalCIRP Annals - Manufacturing Technology
Volume65
Issue number1
DOIs
StatePublished - 2016

Keywords

  • Carbon migration
  • Hard machining
  • Nano structure

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