Influence of Silicon on the Properties of Aluminum Alloy Powders of the Silumin Type and the Mechanical Properties of Pr
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NOLOGY OF INORGANIC SUBSTANCES AND MATERIALS
Influence of Silicon on the Properties of Aluminum Alloy Powders of the Silumin Type and the Mechanical Properties of Products Made from These Powders by Selective Laser Melting D. K. Ryabova, *, D. A. Kozlovb, A. K. Petrovb, A. V. Garshevb, P. V. Evdokimovb, Ya. Yu. Filippovb, N. K. Orlovb, V. I. Putlyaevb, A. V. Chetvertukhinb, A. Yu. Krokhina, A. P. Khromova, V. A. Korolevc, and I. Yu. Mikhailovc aOK
RUSAL, Moscow, 121096 Russia State University, Moscow, 119991 Russia c OOO Institute of Light Materials and Technologies, OK RUSAL, Moscow, 119049 Russia *e-mail: [email protected] bMoscow
Received May 15, 2019; revised June 12, 2019; accepted July 10, 2019
Abstract—Technologies for the 3D printing of metallic powders are being increasingly extensively used around the world as alternatives to casting and machining to manufacture components of complex shapes and prototypes. Silicon-alloyed aluminum alloys are the most widely used materials in the selective laser melting technologies, which is caused by the price of these alloys and their high manufacturability for the layer-bylayer fused deposition, owing to their low susceptibility to hot cracking under thermal and shrinkage stresses. High rates of cooling the melt facilitate the formation in the material of ultradispersed silicon-containing phases, which results in increased strength. In the article, exemplified by two cast alloys (AK7ch and AK9ch), the speeds of the process of building up the products by the selective laser melting technology have been determined at a laser-beam power of 300 and 325 W and an energy density within the range 89–32 J/mm3. It is shown that, for the AK9ch alloy, lower porosity values are achieved within the investigated energy density range when compared with the AK7ch alloy and better mechanical properties of the alloy with a higher silicon content are achieved within the range of lower laser-beam energy densities than for the alloy with a lower silicon content. The mechanical properties of the materials produced under the optimal selective laser melting conditions comply with the most stringent requirements for the mechanical characteristics of the castings of the AK7ch alloy upon heat treatment. Keywords: aluminum alloy, selective laser melting, additive manufacturing technologies, AK7ch alloy, AK9ch alloy, microstructure, mechanical properties DOI: 10.1134/S004057952005019X
INTRODUCTION Presently, additive manufacturing technologies are being increasingly extensively used in various industries [1]. Due to its high accuracy of building up components, set of high qualities of the fused material, and high utilization factor of the metal, selective laser melting (SLM) is one of the most promising technologies [2]. More and more researchers are trying to adapt the various existing technologies for manufacturing metal powders to their further application as feedstock for the production of materials by the technology in question, including for the manufacture of products of nickel-,
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