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On the dispersion hardening potential of interphase precipitation in micro-alloyed niobium steel

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Abstract

In an experimental high-strength bw-alloy (HSLA) steel micro-alloyed with 0.13wt% Nb, microhardness of the ferrite phase has been measured as a function of the particle spacing across interphase precipation sheets of niobium carbonitrides. The dispersion geometry was controlled by isothermal transformation treatments using different temperatures and time intervals, and evaluated quantitatively by dark-field transmission electron microscopy. The results were in reasonable agreement with the Orowan—Ashby model of dispersion hardening, suggesting that the sheet spacing may represent the effective geometrical parameter responsible for dispersion hardening due to interphase precipitation.

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Author notes

  1. R. M. Brito

    Present address: Companhia Sidenúrgica Nacional, Volta Redonda, Rio de Janeiro, Brazil

  2. H. -J. Kestenbach

    Present address: Departamento de Engenharia de Materiais, Universidade Federal Se São Carlos, São Carlos, S.P., Brazil

Authors and Affiliations

  1. Instituto Militar de Engenharia, Rio de Janeiro, Brazil

    R. M. Brito & H. -J. Kestenbach

Authors
  1. R. M. Brito
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  2. H. -J. Kestenbach
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Brito, R.M., Kestenbach, H.J. On the dispersion hardening potential of interphase precipitation in micro-alloyed niobium steel. J Mater Sci 16, 1257–1263 (1981). https://doi.org/10.1007/BF01033840

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  • DOI: https://doi.org/10.1007/BF01033840

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