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The Influence of Post-Heat-Treatments on the Tensile Strength and Surface Hardness of Selective Laser Melted AlSi10Mg

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Abstract:

Recent investigations revealed major fluctuations in the material properties of selective laser melted AlSi10Mg, which corresponded with the varying precipitation-hardening state of the microstructure, caused by the differing dwell times at elevated temperatures. It was indicated that a subsequent heat treatment balances the age-hardening and results in a homogenized material strength. In order to further investigate this statement selective laser melted AlSi10Mg samples were subject to multiple post-heat-treatments. Subsequently, the surface hardness and tensile strength was determined and compared with the as-built results. The post-heat-treatment led to an arbitrary occurrence of rupture, indicating a successful homogenization, coupled with a remarkable improvement in ductility, but to the costs of a lowered tensile strength, which was highly dependent on the chosen heat-treatment procedure.

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Periodical:

Defect and Diffusion Forum (Volume 370)

Pages:

171-176

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.370.171

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Online since:

January 2017

Authors:

Leonhard Hitzler*, Amandine Charles, Andreas Öchsner

Keywords:

Additive Manufacturing, Alignment, Anisotropy, Dwell Time, Homogenization, Powder-Bed, Precipitation Hardening

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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