Thermal Behavior of Parts Made by Direct Metal Laser Sintering

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Date

1998

Authors

Karapatis, N. P.
Guidoux, Y.
Gygax, P. E.
Glardon, R.

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Abstract

The Direct Metal Laser Sintering (DMLS) manufacturing technique induces thermal stresses in parts. When such parts are used at elevated temperatures, residual stresses are relaxed and the part can suffer significant distortion. This study presents values of geometrical distortion for two laser exposure strategies and for different heat treatment temperatures and durations. Surface and bulk hardness data are provided as well as porosity measurements. At temperatures above 300 the geometrical changes become important. A stabilization treatment. at 600°C can help reduce distortions.

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