Selective laser melting of aluminum die-cast alloy—Correlations between process parameters, solidification conditions, and resulting mechanical properties

Abstract

Microstructure and property modifications of an AISI H13 (4Cr5MoSiV) steel induced by pulsed electron beam treatment J. Vac. Sci. Technol. A 28, 1349 (2010); 10.1116/1.3490019Effect of film thickness and laser energy density on the microstructure of a -GaAs films after excimer laser crystallizationThe additive production technology selective laser melting (SLM) is used for direct fabrication of metal-based functional components. SLM is one of the powder-bed based AM technologies. SLM is well established in serial production for dental restoration as well as for tooling. Main concern for industrial application remains the scope of processible materials and resulting mechanical properties. Toward processing of aluminum alloys commercially available systems exist with comparability in terms of applied process parameters and resulting mechanical properties remaining a challenge. Often no data are available concerning process parameters and mechanical properties. This holds especially for high-power SLM systems with increased build rates as a result of extended laser powers of up to 1 kW. Especially when processing aluminum alloys, the solidification conditions significantly affect the resulting microstructure in terms of size of dendrites and grains. Consequently, the present paper systematically investigates and correlates the process parameters (e.g., laser power, scan speed, layer orientation, preheating, etc.) on the microstructure (electron backscatter diffraction and texture) and resultant mechanical properties (hardness, tensile strength, yield strength, and breaking elongation) for aluminum die-cast alloys. At this, underlying phenomena for typically observed anisotropy of mechanical properties in dependence on layer orientation are further specified. V C 2015 Laser Institute of America.

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

“…Susceptibility of the raw material to alterations caused by varying dwell times at the preheating temperature; variations in the thermal environment due to the transition from solid metal thermal environment to a powder-bed dominated environment Inhomogeneous microstructure and mechanical properties (hardness and strength) due to differing heat treatment stages and varying cooling rates; highly dependent on the material and the preheating settings [91,218,244] Azimuth angle (Θ)…”

Computed tomography for characterization of fatigue performance of selective laser melted parts

“…Stress-relieving heat treatment is recommended to eliminate these stresses. Heating the base plate also reduces the induced residual stresses significantly [18,19]. Microstructure of the resulting SLM part can be controlled by controlling the process parameters.…”

Effect of Process and Post-Process Conditions on the Mechanical Properties of an A357 Alloy Produced via Laser Powder Bed Fusion

“…However, it was pointed out that the platform heating also has an important role on the LPBF consolidation phenomena and the microstructure evolution of the processed materials [23]. Buchbinder et al observed that during the LPBF process of AlSi10Mg, heating the building platform up to 220 • C causes the solidification of a different microstructure, lowering its mechanical properties [22].…”

“…One important building parameter is the building platform temperature which has an important effect on the microstructure and mechanical properties of LPBF parts [21][22][23]. In fact, most of the published studies used the platform heating mainly to reduce residual stresses in the part [21,24].…”