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The effects of thermal history and composition on the hot ductility of low carbon steels

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Abstract

The hot tensile test was used to investigate the effects of certain key variables on the hot ductility of low carbon steels. A transition from high to low ductility occurred at about 2200°F (1204°C) during continuous cooling of both wrought and cast specimens of low carbon steel after relatively brief exposure to temperatures above 2400°F (1316°C). The observed loss in ductility on cooling below 2200°F (1204°C): (a) increased with decreasing manganese-sulfur ratios, (b) was minimized by appropriate variations in thermal history. Metallographic and fractographic examination of the tensile specimens after thermal cycling indicated that this low ductility below 2200°F (1204°C) resulted from microcracking associated with (Mn, Fe)S precipitates found at the austenite grain boundaries. The results of this investigation help explain why different levels of hot ductility are observed in low carbon steels and what steps can be taken to improve this ductility.

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Authors and Affiliations

  1. Specialty Steels, Jones& Laughlin Steel Corp., Pittsburgh, Pa.

    G. A. Wilber (Staff Metallurgist)

  2. Triangle Conduit and Cable Co., New Brunswick

    R. Batra (Metallurgist)

  3. Rensselaer Polytechnic Institute, Troy

    W. F. Savage (Professor of Metallurgical Engineering)

  4. Reel Vortex, Inc., Troy, New York

    W. J. Childs (President)

Authors
  1. G. A. Wilber
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  2. R. Batra
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  3. W. F. Savage
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  4. W. J. Childs
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Wilber, G.A., Batra, R., Savage, W.F. et al. The effects of thermal history and composition on the hot ductility of low carbon steels. Metall Trans A 6, 1727–1735 (1975). https://doi.org/10.1007/BF02642300

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  • DOI: https://doi.org/10.1007/BF02642300

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