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Niobium carbonitride precipitation and austenite recrystallization in hot-rolled microalloyed steels

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Abstract

The response of austenites to thermomechanical treatments is studied in a series of niobium (columbium) HSLA steels. Interactions between composition, plastic deformation, strain-induced precipitation, and austenite recrystallization are described and related to previous work in the field. Niobium in solution prior to deformation leads to significant retardation of subsequent austenite recrystallization if Nb(C,N) precipitation takes place prior to or during the early stages of recrystallization. Such straininduced precipitation proceeds in two stages: initially at austenitic grain boundaries and deformation bands, and later on substructural features in the unrecrystallized austenite. The latter precipitation is accelerated only if it occurs in the unrecrystallized austenite; if recrystallization precedes Nb(C,N) precipitation, then the precipitation reaction is much slower. Thus, the Nb(C,N) precipitation and austenite recrystallization reactions are coupled phenomena. The conditions necessary for such an interaction are analyzed, and it is proposed that the level of supersaturation of Nb(C,N) in the austenite at the deformation temperature is a critical factor in determining whether or not an effective interaction will operate at that temperature.

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Authors and Affiliations

  1. Research Department, Bethlehem Steel Corporation, 18016, Bethlehem, PA

    S. S. Hansen (Engineer)

  2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 02139, Cambridge, MA

    J.B. Vander Sande (Associate Professor) & Morris Cohen (Institute Professor Emeritus)

Authors
  1. S. S. Hansen
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  2. J.B. Vander Sande
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  3. Morris Cohen
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Additional information

This paper is based on a presentation made at a symposium on “Precipitation Processes in Structural Steels” held at the annual meeting of the AIME, Denver, Colorado, February 27 to 28, 1978, under the sponsorship of the Ferrous Metallurgy Committee of The Metallurgical Society of AIME.

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Hansen, S.S., Sande, J.V. & Cohen, M. Niobium carbonitride precipitation and austenite recrystallization in hot-rolled microalloyed steels. Metall Trans A 11, 387–402 (1980). https://doi.org/10.1007/BF02654563

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