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Kinetics of secondary carbides precipitation in a high-chromium white iron

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Abstract

This work analyzes the rate of secondary carbides precipitation during the destabilization heat treatment of a 17% Cr white iron. The experimental iron was characterized in the as-cast conditions to have comparable parameters with the heat treated samples. Destabilization heat treatments were undertaken at temperatures of 900, 1000, and 1150 °C for between 5 min and 8 h; each sample was water quenched immediately after being taken out of the furnace. Characterization was carried out by optical and electron microscopy, image analysis, and energy dispersive spectroscopy (EDS) microanalysis; hardness and microhardness were also evaluated. It was found that most of the secondary carbides that precipitate (between 2–30% of the matrix volume) precipitated in less than 2 h for the lowest destabilization temperature (900 °C). The secondary carbides volume fraction was found to increase for lower destabilization temperatures and large soaking times. A very low carbide precipitation along with a stabilization of the austenite phase occurred for heat treatments at 1150 °C. The results are discussed in terms of the solubility of chromium and carbon in the austenite phase at the different treatment temperatures.

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Authors and Affiliations

  1. Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo, C.P. 58000, Morelia, Michoacan, México

    A. Bedolla-Jacuinde, L. Arias & B. Hernández

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  1. A. Bedolla-Jacuinde
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  2. L. Arias
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  3. B. Hernández
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Bedolla-Jacuinde, A., Arias, L. & Hernández, B. Kinetics of secondary carbides precipitation in a high-chromium white iron. J. of Materi Eng and Perform 12, 371–382 (2003). https://doi.org/10.1361/105994903770342881

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