Abstract
Al–12Si specimens are produced by selective laser melting (SLM) from gas atomized powders. Installation for the production of powder is original. All specimens were prepared using the EOSINT M 280 device. A fine cellular structure is observed with residual free Si along the cellular boundaries. Room temperature tensile tests reveal remarkable mechanical behavior: the samples show yield and tensile strengths of about 102 MPa and 425 MPa, respectively, along with fracture strain of 12%. The study of crack surface morphology was shown by the example of a sample. Except the spherical pores, the interface of the molten pool also appears on the fracture surface, which indicates a mixture of fragile and ductile fracture. Additionally, the agglomerated silicon group appears also on the fracture surface.
Highlights
Selective laser melting (SLM) is an important additive manufacturing process for metal materials, which can produce parts with sophisticated shapes with small material wastage during production [1]
Investigation of microstructure and mechanical properties was performed for selective laser melting (SLM) processed Al-12Si alloy
Except the spherical pores, the interface of molten pool appears on the fracture surface
Summary
Selective laser melting (SLM) is an important additive manufacturing process for metal materials, which can produce parts with sophisticated shapes with small material wastage during production [1]. Compared with the conventional casted Al-12Si alloy, an additional and important advantage of the SLM processed sample is the ultrafine microstructure, which leads to improvement of the mechanical properties. The feedstock materials of the SLM process for Al12Si alloy were powders of brand EOS [1-3]. This powder presents good performance due to homogenous distribution of elements, leading to formation of uniform physical and chemical properties. In these studies of feedstock materials of the SLM process, powders of the Russian brand "AKD12" were used for the Al-12Si alloy. Investigation of microstructure and mechanical properties was performed for SLM processed Al-12Si alloy
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