Influence of supersaturated carbon on the diffusion of Ni in ferrite determined by atom probe tomography
KAUST DepartmentMaterial Science and Engineering Program
Physical Science and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/562931
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AbstractIn patented and cold-drawn pearlitic steel wires dissociation of cementite occurs during mechanical deformation. In this study the influence of the carbon decomposition on the diffusion of nickel in ferrite is investigated by means of atom probe tomography. In the temperature range 423-523 K we observed a much smaller activation energy of Ni diffusion than for self-diffusion in body-centered cubic iron, indicating an increased vacancy density owing to enhanced formation of vacancy-carbon complexes. © 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
SponsorsThe authors thank Prof. S. Goto of Akita University, Japan, and the Nippon Steel Corp. for fabrication and providing the cold-drawn specimens. We also thank U. Tezins of the Max-Planck-Institut fur Eisenforschung in Dusseldorf for performing the LEAP measurements. We are grateful to the Deutsche Forschungsgemeinschaft for funding this Project (SFB 602, TP B13). T.A.-K. acknowledges the generous support of KAUST baseline funds.