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Effect of prior-austenite grain size and transformation temperature on nodule size of microalloyed hypereutectoid steels

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Abstract

The effect of prior-austenite grain size and transformation temperature on nodule size and colony size of hypereutectoid steels containing 1 pct carbon with different levels of vanadium and silicon was investigated. Specimens of the various steels were thermally processed at various temperatures ranging from 900 °C to 1200 °C and transferred to salt bath conditions at 550 °C, 580 °C, and 620 °C to examine the structural evolution of pearlite. The heat-treatment work showed that for only the hypereutectoid steel without vanadium there was a continuous grain boundary cementite network, the thickness of which increased with increasing reheat temperature. Analysis of the thermally processed hypereutectoid steels also indicated that the prior-austenite grain size and transformation temperature controlled the nodule size, while the colony size was dependent on the latter only.

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Authors and Affiliations

  1. the Department of Metals and Materials Engineering, McGill University, H3A 2B2, Montreal, PQ, Canada

    A. M. Elwazri (Research Associate) & S. Yue (Professor)

  2. the Aerospace Manufacturing Technology Centre, Institute for Aerospace Research, National Research Council of Canada, H3T 2B2, Montreal, PQ, Canada

    P. Wanjara (Research Officer)

Authors
  1. A. M. Elwazri
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  2. S. Yue
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  3. P. Wanjara
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Elwazri, A.M., Yue, S. & Wanjara, P. Effect of prior-austenite grain size and transformation temperature on nodule size of microalloyed hypereutectoid steels. Metall Mater Trans A 36, 2297–2305 (2005). https://doi.org/10.1007/s11661-005-0102-7

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  • DOI: https://doi.org/10.1007/s11661-005-0102-7

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