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A stress relaxation method for following carbonitride precipitation in austenite at hot working temperatures

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Abstract

Stress relaxation measurements were carried out on a plain carbon and four solution-treated Ti steels over the temperature range 850 to 1050 °C. The results show that the stress relaxation of plain carbon austenite after a 5 pct prestrain (i.e., in the absence of precipitation) can be described by the relation σ = σ0 -α ln(l + βt). By contrast, in the solution-treated Ti steels, relaxation is arrested at the start of precipitation and is resumed when precipitation is completed. As a result, this mechanical method is particularly suitable for following carbonitride precipitation in microalloyed austenite at hot working temperatures. A new model regarding the effect of precipitation on dislocation motion is proposed, on the basis of which, the phenomenology of the stress relaxation technique is clarified. Precipitation-time-temperature (PTT) diagrams were determined for the Ti bearing steels containing 0.05, 0.11, 0.18, and 0.25 pct Ti. The PTT curves obtained are C-shaped for all the steels. The upper parts of these curves are shifted to significantly longer times as the Ti and C concentrations are reduced. By contrast, the positions of the lower arms of the curves are relatively independent of the compositions of the steels tested.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, McGill University, 3450 University Street, H3A 2A7, Montreal, PQ, Canada

    W. J. Liu (Research Associate) & J. J. Jonas (Professor)

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  1. W. J. Liu
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  2. J. J. Jonas
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Liu, W.J., Jonas, J.J. A stress relaxation method for following carbonitride precipitation in austenite at hot working temperatures. Metall Trans A 19, 1403–1413 (1988). https://doi.org/10.1007/BF02674014

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  • DOI: https://doi.org/10.1007/BF02674014

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