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Compositional effects on the creep ductility of a low alloy steel

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Abstract

The role which P plays in determining the creep ductility of 2.25Cr-1Mo steel is examined by notched bar creep rupture tests on high purity material selectively doped with combinations of Mn, Si and P. The impurity concentrations, hardness and grain size were carefully controlled. The ductility of as-tempered samples containing dopants was found to be higher than those without dopants; however the ductility of step cooled samples containing Mn and P was found to be lower than as-tempered samples. It is suggested that P, when segregated to the prior austenite grain boundaries, enhances the nucleation of grain boundary cavities while retarding their growth. Mechanisms for each process are proposed.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Science, McMaster University, L8S 4L7, Hamilton, Ontario

    D. S. Wilkinson (Assistant Professor)

  2. Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai, Japan

    K. Abiko (Research Associate)

  3. National Beryllia Corporation, 07420, Haskell, NJ

    N. Thyagarajan (Process Engineer)

  4. Department of Materials Science and Engineering, University of Pennsylvania, 19104, Philadelphia, PA

    D. P. Pope (Associate Professor)

Authors
  1. D. S. Wilkinson
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  2. K. Abiko
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  3. N. Thyagarajan
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  4. D. P. Pope
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Additional information

Formerly a Postdoctoral Research Fellow at the University of Pennsylvania

formerly a Visiting Scientist at the University of Pennsylvania

Formerly a Graduate Student at the University of Pennsylvania

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Wilkinson, D.S., Abiko, K., Thyagarajan, N. et al. Compositional effects on the creep ductility of a low alloy steel. Metall Trans A 11, 1827–1836 (1980). https://doi.org/10.1007/BF02655098

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  • DOI: https://doi.org/10.1007/BF02655098

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