Measurements and Modeling of Stress in Precipitation-Hardened Aluminum Alloy AA2618 during Gleeble Interrupted Quenching and Constrained Cooling - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Metallurgical and Materials Transactions A Année : 2016

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

Nicolas Chobaut
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Peter Saelzle
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Jean-Marie Drezet
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Résumé

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.

Dates et versions

hal-02110751 , version 1 (25-04-2019)

Identifiants

Citer

Nicolas Chobaut, Denis Carron, Peter Saelzle, Jean-Marie Drezet. Measurements and Modeling of Stress in Precipitation-Hardened Aluminum Alloy AA2618 during Gleeble Interrupted Quenching and Constrained Cooling. Metallurgical and Materials Transactions A, 2016, 47A (11), pp.5641-5649. ⟨10.1007/s11661-016-3724-z⟩. ⟨hal-02110751⟩
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