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Analytical electron microscopy of internally oxidized low Si-Al steel

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Abstract

Analytical electron microscopy was used to study the precipitates in internally oxidized low Si-Al steels, of the type used for electric motor laminations. After oxidizing heat treatments of one and five hours at 788 °C, the internally precipitated particles were about 0.1 to 0.2 μm in diameter. At the internal-oxidation reaction front, thin plates of Al2O3 precipitated. Subsequently, a shell of SiO2 precipitated on the Al2O3 core. Depth of internal oxidation was predicted from the knowledge of precipitate composition, treatment time and temperature, and published information.

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Authors and Affiliations

  1. Research Department, Steel Products Division, Homer Research Laboratories, Bethlehem Steel Corporation, 18016, Bethlehem, PA

    J. R. Michael (Research Engineer) & E. T. Stephenson (Senior Scientist)

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  1. J. R. Michael
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  2. E. T. Stephenson
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Michael, J.R., Stephenson, E.T. Analytical electron microscopy of internally oxidized low Si-Al steel. Metall Trans A 19, 953–959 (1988). https://doi.org/10.1007/BF02628380

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