The role of carbon segregation on nanocrystallisation of pearlitic steels processed by severe plastic deformation

By X. Sauvage, Y. Ivanisenko. 2007

148 citations recorded by the source corpus.

The nanostructure and the carbon distribution in a pearlitic steel processed by torsion under high pressure was investigated by three-dimensional atom probe. In the early stage of deformation (shear strain of 62), off-stoichiometry cementite was analysed close to interphase boundaries and a strong segregation of carbon atoms along dislocation cell boundaries was observed in the ferrite. At a shear strain of 300, only few nanoscaled off-stoichiometry cementite particles remain and a nanoscaled equiaxed grain structure with a grain size of about 20 nm was revealed. 3D-AP data clearly point out a strong segregation of carbon atoms along grain boundaries. The influence of this carbon atom segregation on the nanostructure formation is discussed and a scenario accounting for the nanocrystallisation during severe plastic deformation is proposed.

Subfields: Biomedical Engineering, Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/9ff25b7f825ddc9c116c918de0729ac0938c5238

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Citations in the corpus

Nanostructure and related mechanical properties of an Al–Mg–Si alloy processed by severe plastic deformation (2008, background): “d that the HPT process induces a segregation along dislocation cell or grain boundaries. Similar planar segregations were recently reported also for carbon atoms in a pearlitic steel processed by HPT [26]. Using published data on 6061 alloys, one can estimate the Hall-Petch hardening of the 6061 all”