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

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...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2016-11, Vol.47 (11), p.5641-5649
Main Authors: Chobaut, Nicolas, Carron, Denis, Saelzle, Peter, Drezet, Jean-Marie
Format: Article
Language:English
Subjects:
Aluminum alloys
Aluminum base alloys
Characterization and Evaluation of Materials
Chemical Sciences
Chemistry and Materials Science
Constraints
Cooling
Engineering Sciences
Heat treatment
Impellers
Material chemistry
Materials
Materials Science
Mathematical models
Metallic Materials
Nanotechnology
Quenching
Quenching (cooling)
Shear stress
Stresses
Structural Materials
Surfaces and Interfaces
Thin Films
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Summary: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.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-016-3724-z