Affiliation:
1. SeAh Besteel Co
2. Korea Advanced Institute of Science and Technology (KAIST)
3. Hongik University
Abstract
More than 2% δ-ferrite phase is presented in type 316L stainless steels due to improvement
of hot workability or welding process. In order to clarify the mechanism on how the δ-ferrite affects
the corrosion resistance, electrochemical tests in a micro-droplet cell were conducted and
microstructures were analyzed by TEM-EDS and SEM-EDS. Especially, the micro-droplet cell was
modified at our laboratory to observe the polarization behavior of δ-ferrite phase in an acidic chloride
solution. The anodic polarization behavior in both active zone and passive zone was affected by
δ-ferrite. The degradation of corrosion resistance in the low potential zone with δ-ferrite phase is due
to the preferential dissolution of a matrix, γ phase. It is explained with the fact that the formation of
δ-ferrite lowers the concentrations of chromium and molybdenum in γ phase. It is also confirmed by
potentiostatic test, EDS analyses and phase-equilibrium prediction. In addition, the micro-droplet cell
and EDS analysis reveled that the pitting potential in the neutral pH solution was affected by Ca
containing inclusion rather than δ-ferrite phase.
Publisher
Trans Tech Publications, Ltd.
Subject
Condensed Matter Physics,General Materials Science,Atomic and Molecular Physics, and Optics
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