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Measurements and Modeling of Stress in Precipitation-Hardened Aluminum Alloy AA2618 during Gleeble Interrupted Quenching and Constrained Cooling

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Abstract

Solutionizing and quenching are the key steps in the fabrication of heat-treatable aluminum parts such as AA2618 compressor impellers for turbochargers as they highly impact the mechanical characteristics of the product. In particular, quenching induces residual stresses that can cause unacceptable distortions during machining and unfavorable stresses in service. Predicting and controlling stress generation during quenching of large AA2618 forgings are therefore of particular interest. Since possible precipitation during quenching may affect the local yield strength of the material and thus impact the level of macroscale residual stresses, consideration of this phenomenon is required. A material model accounting for precipitation in a simple but realistic way is presented. Instead of modeling precipitation that occurs during quenching, the model parameters are identified using a limited number of tensile tests achieved after representative interrupted cooling paths in a Gleeble machine. This material model is presented, calibrated, and validated against constrained coolings in a Gleeble blocked-jaws configuration. Applications of this model are FE computations of stress generation during quenching of large AA2618 forgings for compressor impellers.

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Acknowledgments

This work is funded by the Competence Center for Materials Science and Technology in the frame of the project entitled “Measurements and modeling of residual stress during quenching of thick heat-treatable aluminum components in relation to their microstructure” involving EPF Lausanne, PSI Villigen, Univ. Bretagne Sud Lorient, Constellium and ABB Turbo Systems Ltd. The Gleeble 3500 machine of Univ. BretagneSud was co-financed by European Regional Development Fund. The authors are grateful to Professor P. Pilvin and W. Berckmans (Univ. Bretagne Sud) for providing SiDoLo and for the instrumentation of the Gleeble specimens, respectively.

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Authors and Affiliations

  1. Ecole Polytechnique Fédérale de Lausanne, Laboratoire de Simulation des Matériaux, Station 12, 1015, Lausanne, Switzerland

    Nicolas Chobaut & Jean-Marie Drezet

  2. Univ. Bretagne Sud, FRE CNRS 3744, IRDL, F-56100, Lorient, France

    Denis Carron

  3. ABB Turbo Systems Ltd, Bruggerstrasse 71a, 5400, Baden, Switzerland

    Peter Saelzle

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  1. Nicolas Chobaut
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  2. Denis Carron
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  3. Peter Saelzle
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  4. Jean-Marie Drezet
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Correspondence to Jean-Marie Drezet.

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Manuscript submitted April 7, 2016.

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Chobaut, N., Carron, D., Saelzle, P. et al. Measurements and Modeling of Stress in Precipitation-Hardened Aluminum Alloy AA2618 during Gleeble Interrupted Quenching and Constrained Cooling. Metall Mater Trans A 47, 5641–5649 (2016). https://doi.org/10.1007/s11661-016-3724-z

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  • DOI: https://doi.org/10.1007/s11661-016-3724-z

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