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Delta-ferrite recovery structures in low-carbon steels

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Abstract

The development of delta-ferrite recovery substructures in low-carbon steels has been observed in-situ utilizing laser scanning confocal microscopy (LSCM). Well-developed sub-boundaries with interfacial energies much smaller than that of delta-ferrite grain boundaries formed following transformation from austenite to delta-ferrite on heating. It is proposed that transformation stresses associated with the austenite to delta-ferrite phase transformation generate dislocations that subsequently recover into sub-boundaries by a process of polygonization. Experimental evidence in support of this proposal was found in a ferritic stainless steel. Thermal cycling through the high-temperature delta-ferrite/austenite/delta-ferrite phase transformation leads to the development of a well-defined recovery substructure, which, in turn, modifies the low-temperature austenite decomposition product from Widmanstätten to polygonal ferrite, with a commensurate change in hardness.

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Authors and Affiliations

  1. the BHP Steel Institute, University of Wollongong, 2500, Wollongong, Australia

    R. J. Dippenaar (Director) & D. J. Phelan (Research Fellow)

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  1. R. J. Dippenaar
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  2. D. J. Phelan
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This article is based on a presentation given in the Mills Symposium entitled “Metals, Slags, Glasses: High Temperature Properties & Phenomena,” which took place at The Institute of Materials in London, England, on August 22–23, 2002.

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Dippenaar, R.J., Phelan, D.J. Delta-ferrite recovery structures in low-carbon steels. Metall Mater Trans B 34, 495–501 (2003). https://doi.org/10.1007/s11663-003-0016-y

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  • DOI: https://doi.org/10.1007/s11663-003-0016-y

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