Influence of process-induced microstructure and imperfections on mechanical properties of AlSi12 processed by selective laser melting

Siddique, Shafaqat; Imran, Muhammad�; Wycisk, Eric; Emmelmann, Claus; Walther, Frank

doi:10.1016/j.jmatprotec.2015.02.023

Cited by 210 publications

(129 citation statements)

References 22 publications

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“…Two main observations can be envisaged here. First is that fatigue strength of batch D being ~33% higher and its standard deviation is less in comparison to batch C. The second is consistent with LCF results reported in [11], but the first is not. The observation indicates alteration of damage mechanisms from LCF to VHCF with possibilities to tailor properties specifically for a given fatigue regime.…”

Section: Fig 7 Plastic Strain Amplitude Reaction In a Load Increasesupporting

confidence: 85%

“…It can be seen that batch B has higher values of Young's modulus, yield strength, ultimate tensile strength and fracture strain. The result agrees with [11] for fracture strain but disagrees with it in ultimate tensile strength. The cited work suggested that microstructure coarsening by PH increased ductility but reduced tensile strength.…”

Section: Modeling and Simulationsupporting

confidence: 70%

“…One more issue that interacts with this factor is the reduction of residual stresses through PH. The latter was also proved to induce microstructure coarsening [11]. The interaction between remnant porosity, residual stresses as well as microstructure resulting from PH is revealed in the mechanical quasi-static and cyclic experiments.…”

Section: Experimental Testingmentioning

confidence: 90%

“…An inert atmosphere of argon gas was applied for shielding the melt tracks during build-up which was flowing from the left of the chamber to the right. The function of the shielding gas is to ensure purity of melt pools to prevent the formation of inclusions [11]. The scanning method is designed such that porosity and residual stresses are kept to a minimum.…”

Section: Experimental Testingmentioning

confidence: 99%

“…Application of PH reduced mean fatigue strength as well as standard deviation. Since crack initiation from internal porosity was observed, reduction of porosity by PH increased fatigue strength reliability [11].…”

Section: Introductionmentioning

confidence: 99%

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Qualification of selective laser-melted Al alloys against fatigue damage by means of measurement and modeling techniques

et al. 2018

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Abstract. Aluminum alloys processed through selective laser melting possess unique features of microstructure, defect morphology and mechanical properties. Constitution of fine cellular dendrites results from the high-cooling rate of the melt pool during the consolidation process. Investigation of the microstructure by scanning electron microscopy identifies supersaturation of Si particles as a secondary strengthening mechanism. On the contrary, platform heating that induces coarser microstructure leads to migration of Si particles from the Al matrix to the eutectic phase. As a result, tensile strength is reduced by 3%, while fracture strain is increased by 17%. Fine-grained structures exhibit a lower amount of plastic damage accumulation as well as delayed crack initiation as determined by the applied measurement techniques. Finite element models of the investigated configurations are obtained using scans of computed tomography under consideration of process-induced defects. Comparison of modeling and experimental results concluded that dominant fatigue damage mechanisms are related to the loading regime from low-cycle (LCF) to very-high-cycle fatigue (VHCF). Thus, process-inherent features of microstructure and porosity have different quantitative effects concerning the applied load. In VHCF, a material configuration with platform heating possesses an improved fatigue strength by 33% at 1E9 cycles, concerning the material configuration without platform heating.

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Section: Fig 7 Plastic Strain Amplitude Reaction In a Load Increasesupporting

confidence: 85%

Section: Modeling and Simulationsupporting

confidence: 70%

Section: Experimental Testingmentioning

confidence: 90%

Section: Experimental Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Qualification of selective laser-melted Al alloys against fatigue damage by means of measurement and modeling techniques

et al. 2018

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Thermokinetics, Microstructural Evolution, and Material Response

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Fusion‐Based Additive Manufacturing for Processing Aluminum Alloys: State‐of‐the‐Art and Challenges

2017

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The fusion-based additive manufacturing of Al alloys has been developing at an ever faster pace since early 2015, after a comparatively slow start with respect to other metallic materials. This paper reviews the recent developments with the aim of identifying challenges and opportunities for future work. Additive Al components possess strongly out-of-equilibrium microstructures resulting in potentially enhanced mechanical properties. A deeper understanding of the thermal history during fabrication, the design of new high strength alloys and the development of better adapted post-processing procedures are still needed to take full advantages of the specificities of additive manufacturing.

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Influence of process-induced microstructure and imperfections on mechanical properties of AlSi12 processed by selective laser melting

Cited by 210 publications

References 22 publications

Qualification of selective laser-melted Al alloys against fatigue damage by means of measurement and modeling techniques

Qualification of selective laser-melted Al alloys against fatigue damage by means of measurement and modeling techniques

Thermokinetics, Microstructural Evolution, and Material Response

Fusion‐Based Additive Manufacturing for Processing Aluminum Alloys: State‐of‐the‐Art and Challenges

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