Abstract
This article presents a study on the influence of temperature and time of multi-variant heat treatment on the structure and properties of materials produced in direct metal laser sintering (DMLS) and casting technology. The materials were manufactured in the form of cuboidal elements with a cross-section of 1.5 mm × 15 mm and a length of 60 mm. The samples prepared in this way had a similar volume, but due to the production technology the metal crystallization took place at different rates and directions. In the cast, the direction of heat transfer was toward the mold, and the DMLS was directed locally layer by layer. The small thickness of the cast material allowed reaching conditions similar to the DMLS cooling process. Both DMLS and cast samples show similar mechanical properties (hardness) achieved after long ageing time, i.e., 16 h at 170 °C. The maximum hardness was observed for 8 h. In the DMLS samples, in contrast to cast samples, no lamellar precipitates of silicon were observed, which indicates their better resistance to cracking
Highlights
Due to the favorable ratio of mechanical properties to density, easy machining and high fatigue strength, aluminum alloys are used in the manufacturing of many structural elements in the form of castings, or for forging or welding
Takata et al [42] investigated the microstructure and mechanical properties of AlSi10Mg samples produced by the SLM method, heat treated at a temperature above 300 ◦C
Girelli et al [43] investigated the effect of temperature, solution treatment and ageing on the microstructure, microhardness and density of AlSi10Mg samples prepared by the SLM method
Summary
Due to the favorable ratio of mechanical properties to density, easy machining and high fatigue strength, aluminum alloys are used in the manufacturing of many structural elements in the form of castings, or for forging or welding. Takata et al [42] investigated the microstructure and mechanical properties of AlSi10Mg samples produced by the SLM method, heat treated at a temperature above 300 ◦C (annealed). They found that at elevated temperatures fine Si particles would inhibit the migration of grain boundary. Girelli et al [43] investigated the effect of temperature, solution treatment and ageing on the microstructure, microhardness and density of AlSi10Mg samples prepared by the SLM method They tested AlSi10Mg samples produced by gravity casting under the same heat treatment conditions. The small thickness of the cast material allowed reaching the conditions similar to the DMLS cooling process
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