Abstract
Partitioning of chromium between cementite and ferrite during the austenite to pearlite transformation in a eutectoid steel containing 1.29 pct chromium has been studied using analytical electron microscopy. No partitioning occurred at the austenite-pearlite interface below 703°C (the no-partition temperature), while above this temperature chromium partitioned preferentially to cementite at the transformation front. Chromium segregation to cementite occurred at all transformation temperatures after pearlite had formed. Measurements of pearlite growth rate and interlamellar spacing have been made for a range of transformation temperatures, and used to examine the rate controlling process for pearlite growth below the no-partition temperature. Growth rates calculated assuming volume diffusion of carbon to be rate controlling were in reasonable agreement with measured growth rates, although the discrepancies between the rates could be accounted for by the partial involvement of interfacial diffusion.
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