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Thermomechcmical processing of Inconel 718 by shock-wave deformation

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Abstract

The response of Inconel 718 nickel-base alloy to thermomechanical processing (TMP) utilizing a 510 Kbar planar shock wave was evaluated. The results were compared with those of conventional TMP by cold rolling to 19.1 pct reduction in thickness; this provided a generalized (or effective) strain equivalent to the transient shock strain. Instead of deformation in the solution treated condition, the inclusion of a predeformation, partial aging step in an optimized TMP schedule led to the greatest improvements in strength, stress-rupture life, and low-cycle fatigue life. The mechanical behavior was correlated with substructure and microstructure. Predeformation aging inhibits thermal recovery during final aging and produces a uniform dispersion of γ′’ precipitates. On a generalized (or effective) strain basis, conventional TMP by cold rolling produces higher strengths than shock TMP due to a higher dislocation density in the former. This suggests that maximum shear strain is a better basis of comparison. Since dislocation substructure is the primary contributor to property modification of Inconel 718 by TMP, the effective service temperature of thermomechanically processed material is limited to 1200°F (649°C), irrespective of the method of working.

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Authors and Affiliations

  1. Seção de Ciência dos Materials, Institute Militar de Engenharia, Pça. Ten. Tibúrcio, Urca, Rio de Janeiro, RJ, Brasil

    Marc A. Meyers (Associate Professor)

  2. Department of Metallurgical Engineering, South Dakota School of Mines and Technology, 57701, Rapid City, SD

    R. Norman Orava (Professor)

Authors
  1. Marc A. Meyers
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  2. R. Norman Orava
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Meyers, M.A., Orava, R.N. Thermomechcmical processing of Inconel 718 by shock-wave deformation. Metall Trans A 7, 179–190 (1976). https://doi.org/10.1007/BF02644455

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