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Factors affecting the final grain size of decarburized lamination steels

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Abstract

A study was made of the effects of carbon content, strain, initial grain size, carbide morphology, annealing time, and temperature on the final grain size produced after the decarburization anneal. The results show that columnar grains form only in higher carbon (0.05/0.06 Pct C) steels with low initial grain sizes (<20 µm) when decarburized at 1450 °F (788 °C). Equiaxed grains, however, are obtained in low carbon (0.02/0.03 Pct C) lamination steels for all processing conditions. It was found that the formation of both equiaxed and columnar final grain size (GS f ) was dependent upon percent strain (ε), initial grain size (GS i ), and carbide distribution (D c ) according to the following regression equations (all grain size measurements in µm):G5 f (columnar grain) = 204 + 0.9GSi - 12.3ε + 37.8D C logGS f (equiaxed grain) = 2.151 + 0.022GSi - 0.038ε - 0.0005GS i · ε- 0.0002(GS i )2 + 0.079D c

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Authors and Affiliations

  1. Energy Research Center, Lehigh University, 18015, Bethlehem, PA

    A. R. Marder

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  1. A. R. Marder
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A.R. Marder, formerly with the Research Department, Bethlehem Steel Corporation, Bethlehem, PA 18016

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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Marder, A.R. Factors affecting the final grain size of decarburized lamination steels. Metall Trans A 17, 1277–1285 (1986). https://doi.org/10.1007/BF02650108

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