Leichtmetallwerkstoffe für hochbelastete Motorblöcke und Zylinderköpfe

Fuchs, Heinrich; Wappelhorst, Michael

doi:10.1007/bf03227134

Cited by 7 publications

(4 citation statements)

References 1 publication

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“…This particular alloy is widely utilized in the automotive industry, e.g. for undercarriages, gearbox housings and engine blocks, and can be fabricated with various casting technologies 8,9 . To the best of the authors' knowledge, this is the first work addressing the fracture toughness of aluminium based raw material fabricated with SLM.…”

Section: Introductionmentioning

confidence: 99%

“…for undercarriages, gearbox housings and engine blocks, and can be fabricated with various casting technologies. 8,9 To the best of the authors' knowledge, this is the first work addressing the fracture toughness of aluminium-based raw material fabricated with SLM. For this initial study, no post-heat treatments like solution annealing or age hardening were considered.…”

Section: Introductionmentioning

confidence: 99%

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Fracture toughness of selective laser melted AlSi10Mg

Hitzler

Hirsch

Schanz

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part L:

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Additive manufacturing represents a unique opportunity for the generation of highly complex components. Given the inherent anisotropic material behaviour, reasoned in the layer-wise generation process and the resulting span of mechanical properties with the lack of available data, the implementation of this manufacturing technique in industrial applications is challenging and requests expensive and time consuming material testing. This work focuses on the fracture toughness of selective laser melted precipitation-hardenable AlSi10Mg specimens, including positioning and inclination effects. Samples in accordance to the ASTM E 399-08 standard were fabricated in six different orientations and were subject to mode I fracture toughness testing. The notches were implemented in a subsequent milling procedure and the evaluation was undertaken as outlined in the ASTM E 1820-09 standard. Minor directional dependencies were found and the selective laser melted samples revealed similar fracture toughness results as conventional bulk material, namely K IC-values in the range from 40 to 60 MPa√m.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fracture toughness of selective laser melted AlSi10Mg

Hitzler

Hirsch

Schanz

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…1 The decision in favour of AlSi10Mg (powder form; grain size range 15-70 µm) is based on the fact that it is a material that is widely used in the automotive industry (undercarriages, gearbox housings, and engine blocks). 8 The large number of application areas results in a high benefit. 1 To obtain more precise knowledge of the respective influences of the powder coating properties on the finished component, it is necessary to carry out further systematic investigations.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of parameters for AlSi10Mg powders from different manufacturers in selective laser melting

Riegraf

Öchsner

Greuling

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Customer expectations are increasing, especially with regard to the individualization of products, in which additive manufacturing is described as a disruptive technology. With a view to using the technology in a series application, extensive knowledge of the starting material, the powder, is necessary. In this article, AlSi10Mg in powder form (grain size range: 15–70 µm), which is used for the selective laser melting process, is analysed on the basis of various investigations. A distinction is made from other researchers, as a total of six powders of the same specification but from different manufacturers were used. An investigation of the relative humidity of the powders in the as-delivered condition was carried out using a moisture meter. It could be shown that the moisture lies between 5% and 15% and that the moisture can be reduced by about half by using dry bags. A qualitative examination with a scanning electron microscopy showed that the morphology and size distribution differ. Not only partially round, but also very misshapen particles and particles with and without adhesions are present. The flowability was determined with a calibrated Hall flowmeter. It was found that a lower proportion of fine particles in the powder lead to a more uniform flowability. In the investigation, a distinction was made between powder in the as-received state and dried powder. The particle size distribution was determined with a laser diffraction method and evaluated according to the Mie theory. To be able to carry out porosity analyses on the basis of micrographs, test cubes with the dimensions (10 × 10 × 10 mm3) were used. The parameters scanning speed (400–600 mm/s), hatch spacing (0.19–0.29 mm), and laser power (220–320 W) were varied. The results vary between 0.12% and 5.46% porosity. To combine the results, a pairwise comparison and a use-value analysis were carried out. Overall, the differences in the powders of the different manufacturers were found to be small, so that a recommendation was made for the most economical powder.

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“…Hot components of an internal combustion engine (ICE) like cylinder heads, exhaust manifolds, etc., are subjected to cyclic thermal loads during their lifecycle. The components can experience severe temperature transients, say, from −30 • C during a cold start in winter months to operating temperatures of more than 230 • C in hot parts of the power train systems [8][9][10]. Such start-operate-stop thermal cycles induce low cycle thermo-mechanical fatigue failures in sections that are particularly susceptible to cracking, such as the valve bridge areas in cylinder heads [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effects of Temperature on the Evolution of Yield Surface and Stress Asymmetry in A356–T7 Cast Aluminium Alloy

et al. 2021

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As the electrification of vehicle powertrains takes prominence to meet stringent emission norms, parts of internal combustion engines like cylinder heads are subjected to an increased number of thermal load cycles. The cost-effective design of such structures subjected to cyclic thermo-mechanical loads relies on the development of accurate material models capable of describing the continuum deformation behaviour of the material. This study investigates the effect of temperature on the evolution of flow stress under cyclic loading in A356-T7 + 0.5% Cu cast aluminium alloy commonly used in modern internal combustion engine cylinder heads. The material exhibits peak stress and flow stress asymmetry with the stress response and flow stress of the material under compressive loading higher than under tension. This peak and flow stress asymmetry decrease with an increase in temperature. To compare this stress asymmetry against conventional steel, cyclic strain-controlled fatigue tests are run on fully pearlitic R260 railway steel material. To study the effect of mean strain on the cyclic mean stress evolution and fatigue behaviour of the alloy, tests with tensile and compressive mean strains of +0.2% and −0.2% are compared against fully reversed (Rε = −1) strain-controlled tests. The material exhibits greater stress asymmetry between the peak tensile and peak compressive stresses for the strain-controlled tests with a compressive mean strain than the tests with an identical magnitude tensile mean strain. The material exhibits mean stress relaxation at all temperatures. Reduced durability of the material is observed for the tests with tensile mean strains at lower test temperatures of up to 150 °C. The tensile mean strains at elevated temperatures do not exhibit such a detrimental effect on the endurance limit of the material.

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Leichtmetallwerkstoffe für hochbelastete Motorblöcke und Zylinderköpfe

Cited by 7 publications

References 1 publication

Fracture toughness of selective laser melted AlSi10Mg

Fracture toughness of selective laser melted AlSi10Mg

Experimental analysis of parameters for AlSi10Mg powders from different manufacturers in selective laser melting

Effects of Temperature on the Evolution of Yield Surface and Stress Asymmetry in A356–T7 Cast Aluminium Alloy

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