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Effects of Cooling Rate on Precipitate Evolution and Residual Stresses in Al–Si–Mn–Mg Casting Alloy

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Abstract

The residual stresses with different heat treatment conditions have been measured and correlated with the microstructural behavior of AA365. 30 and 100 K/min cooling of AA365 inhibited the transformation of precipitates under 773 K, respectively. The alloy cooled at 30 and 100 K/min exhibited tensile residual stresses of 6.2 and 5.4 MPa, respectively, while the alloy cooled at 1 and 10 K/min showed compressive stresses of − 12.8 and − 10.3 MPa, respectively. The formation β′, β″, and other intermetallic compounds affected the compressive residual stresses, and that the fracture of the brittle intermetallic phases could reduce the extent of residual stresses in the lattice through plastic deformation.

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Acknowledgements

This work was made possible by Advanced Casting Research Center (ACRC) in Metal Processing Institute “Measurement and Modeling of Residual Stress in Aluminum Casting”.

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  1. Worcester Polytechnic Institute, 100 Institute Rd., Worcester, MA, 01609, USA

    Eunkyung Lee, Caitlin Walde & Brajendra Mishra

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  1. Eunkyung Lee
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  2. Caitlin Walde
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  3. Brajendra Mishra
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Correspondence to Brajendra Mishra.

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Lee, E., Walde, C. & Mishra, B. Effects of Cooling Rate on Precipitate Evolution and Residual Stresses in Al–Si–Mn–Mg Casting Alloy. Met. Mater. Int. 24, 815–820 (2018). https://doi.org/10.1007/s12540-018-0094-7

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  • DOI: https://doi.org/10.1007/s12540-018-0094-7

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