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The kinetics of carbide precipitation in silicon-aluminum steels

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Abstract

The kinetics of carbide precipitation in a fully processed 2.3 wt Pct silicon, 0.66 wt Pct aluminum electrical steel with carbon contents of 0.005 to 0.016 wt Pct were investigated over the temperature range from 150 to 760 °C and times from 30 seconds to 240 hours. The size, morphology, and distribution of the carbide phases, as functions of aging time and temperature, were determined by optical and transmission electron microscopy. The 1.5T core loss was also evaluated and correlated with the changes in precipitation. Distinct C curves were observed for the formation of grain-boundary cementite at temperatures above 350 °C and a transition carbide ({100} α habit plane) at temperatures below 350 °C. Grain-boundary cementite had a relatively small effect on core loss. The large increases in core loss that accompanied transition carbide precipitation peaked at specific aging temperatures depending on the carbon content of the steel. Once a transition carbide dispersion was initially established at a given aging temperature, particle coarsening and core loss changes were generally insensitive to aging time. The influence of a combined addition of silicon and aluminum on the solubility of cementite and the transition carbide in iron was estimated and discussed.

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Author information

Authors and Affiliations

  1. Department of Metallurgy and Materials Science, Case Western Reserve University, 44106, Cleveland, OH

    Gary M. Michal (Assistant Professor)

  2. Advanced Microstructural Analysis, LTV Steel Corporation Research Center, 44131, Independence, OH

    John A. Slane (Supervisor)

Authors
  1. Gary M. Michal
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  2. John A. Slane
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Additional information

This paper is based on a presentation made at the symposium “Physical Metallurgy of Electrical Steels” held at the 1985 annual AIME meeting in New York on February 24–28, 1985, under the auspices of the TMS Ferrous Metallurgy Committee.

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Michal, G.M., Slane, J.A. The kinetics of carbide precipitation in silicon-aluminum steels. Metall Trans A 17, 1287–1294 (1986). https://doi.org/10.1007/BF02650109

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