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A357 Alloy by LPBF for Industry Applications.

Massimo Lorusso1, Francesco Trevisan2, Flaviana Calignano3

  • 1Center for Sustainable Futures Technologies CSFT @Polito, Istituto Italiano di Tecnologia, Via Livorno 60, 10145 Torino, Italy.

Materials (Basel, Switzerland)
|March 29, 2020
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Summary
This summary is machine-generated.

This study optimized Laser Powder Bed Fusion (LPBF) for A357 alloy, achieving high density and hardness. Post-processing heat treatments were crucial for reducing residual stress and enhancing mechanical properties for industrial use.

Keywords:
ageingheat treatmentlaser powder bed fusion (LPBF), A357solution

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Area of Science:

  • Additive Manufacturing
  • Materials Science
  • Metallurgy

Background:

  • Laser Powder Bed Fusion (LPBF) is an advanced additive manufacturing technique.
  • A357 aluminum alloy is suitable for industrial applications due to its properties.
  • Optimizing process parameters and post-processing is key for high-performance components.

Purpose of the Study:

  • Define process parameters for A357 alloy components using LPBF.
  • Evaluate post-processing heat treatments on microstructure and mechanical properties.
  • Achieve maximum hardness and strength in LPBF-fabricated A357 components.

Main Methods:

  • Defined LPBF process parameters for high-density components.
  • Fabricated samples in as-built, stress-relieved, and T6-treated conditions.
  • Investigated microstructural, hardness, and tensile properties.

Main Results:

  • Achieved 99.9% density and 116 HV0.1 hardness in as-built A357 samples.
  • Demonstrated that stress-relieving followed by T6 treatment maintains hardness.
  • Identified optimized solution and aging parameters for T6 treatment.

Conclusions:

  • LPBF is a viable method for producing dense A357 alloy components.
  • Post-processing, including stress-relieving and T6 treatment, is essential for industrial applications.
  • T6 treatment after stress-relieving yields comparable hardness with a more isotropic microstructure.