The effect of heat treatment on the microstructure and mechanical properties of 3D-printed AlSi9Cu3Fe alloy

5th International Conference Recent Trends in Structural Materials

Roudnicka, M.^1,2 ; Dvorsky, D.^1,2 ; Vojtech, D.^1,2

Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technicka 5, Prague 6

166 28, Czech Republic^1

Institute of Physics, Academy of Sciences of the Czech Republic (AS CR), Na Slovance 1999/2, Prague 8

182 21, Czech Republic^2

关键词: Effect of heat treatments;    Fine microstructure;    Hierarchical microstructures;    High cooling rates;    Microstructure and mechanical properties;    Selective laser melting;    T6 heat treatment;    Tensile yield strength;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/461/1/012071/pdf
DOI  :  10.1088/1757-899X/461/1/012071

来源: IOP

【 摘 要 】

In this paper, we characterize AlSi9Cu3Fe alloy prepared by selective laser melting (SLM); a 3D printing technique based on the localized melting of a powder material by a laser beam in thin successively deposited layers. The layer-wise building-up resulted in an anisotropic and hierarchical microstructure of this alloy. High cooling rates brought a very fine microstructure, which contributed to high material strength, but also residual stresses, which are undesirable. Residual stresses can be reduced by various heat treatments. We carried out stress-relief and T6 heat treatments and studied their effect on the microstructure and mechanical properties. T6 heat treatment brought a significant increase in tensile yield strength.