Roughness modeling of AlSi10Mg parts fabricated by selective laser melting

Boschetto, Alberto; Bottini, Luana; Veniali, F.

doi:10.1016/j.jmatprotec.2016.11.013

Cited by 109 publications

(42 citation statements)

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“…The observed roughness is contradictory to LPBF roughness measurements reported by Boschetto et al for AlSi10Mg [9], and by Strano et al for stainless steel [10], in which the peak in roughness appeared at lower angles. As a result, the present surface roughness profile fits poorly with the model introduced by Boschetto et al Several factors will determine the final surface roughness during specimen fabrication, such as powder particle size and morphology, and process parameters.…”

Section: Resultscontrasting

confidence: 99%

High cycle fatigue life estimation of AlSi10Mg processed by laser powder bed fusion

et al. 2018

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Abstract.Fatigue life is known to be dependent on the surface properties of the material. Surface roughness provokes local stress concentration and cause crack initiation even at minute cyclic loads. In laser powder bed fusion, the as-built surfaces show variable roughness depending on the orientation of the specimens with respect to the build plate. In order to analyse the effect of build angle on surface properties, flat tensile specimens were produced from an AlSi10Mg alloy in a Concept Laser M2 Cusing machine. Seven specimens were arranged from flat to perpendicular with respect to the build plate at 15° intervals. The as-built surface topography of each specimen was characterised by white light interferometry. Two methods for calculating the stress concentration factor for high cycle fatigue simulation were developed. The presence of subsurface porosity was a crucial factor in expanding the stress concentration as demonstrated by finite element analysis.

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Section: Resultscontrasting

confidence: 99%

High cycle fatigue life estimation of AlSi10Mg processed by laser powder bed fusion

et al. 2018

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“…Our roughness data for the AlSi10Mg (Figure ) specimens does not match the LPBF roughness data reported by Boschetto et al for AlSi10Mg and by Strano et al for stainless steel, as well as our data of Inconel 718, in which the peak in roughness appears at lower angles. As a result, the surface roughness profile of the AlSi10Mg specimens (Figure ) fits poorly with the surface roughness model introduced by Boschetto et al Several factors will determine the final surface roughness during specimen fabrication, such as powder particle size and morphology, layer height, and process parameters.…”

Section: Resultscontrasting

confidence: 99%

“…The surface roughness vs build angle for the Inconel 718 specimens follows the trends reported by other authors for AM materials; the surface roughness is lowest for the horizontal specimen (0°), followed by a peak in roughness at 15°, and then a decline as the specimens are raised towards the vertical orientation (90°). For the 15° and 30° specimens, the surface roughness values of HIP plus aged Inconel 718 are lower than those of the as‐built specimens.…”

Section: Resultssupporting

confidence: 85%

“…Our roughness data for the AlSi10Mg (Figure 1) specimens does not match the LPBF roughness data reported by Boschetto et al 25 for AlSi10Mg and by Strano et al for stainless steel, 26 as well as our data of Inconel 718, in which the peak in roughness appears at lower angles. As a result, the surface roughness profile of the AlSi10Mg The surface roughness vs build angle for the Inconel 718 specimens follows the trends reported by other authors for AM materials 25,26 ; the surface roughness is lowest for the horizontal specimen (0°), followed by a peak in roughness at 15°, and then a decline as the specimens are raised towards the vertical orientation (90°). For the 15°and 30°specimens, the surface roughness values of HIP plus aged Inconel 718 are lower than those of the as-built specimens.…”

Section: Roughness Measurementscontrasting

confidence: 98%

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High cycle fatigue life estimation of materials processed by laser powder bed fusion

Hovig

Azar

Sunding

et al. 2019

Fatigue Fract Eng Mat Struct

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The fatigue life of metal components is known to depend on the surface topography. For components made by laser powder bed fusion, the roughness of the as‐built surfaces depends on the orientation of the component surface with respect to the build plate. Surface topographies of AlSi10Mg and Inconel 718 specimens built at 0° to 90° inclination, with 15° increments, were characterised by white light interferometry. Two methods for calculating the stress concentration factor using the surface roughness data are proposed, and the results of each approach are presented and compared. Moreover, a finite element model was developed, in order to analyse the stress field when subsurface porosity is present. The fatigue lifetime estimates suggest that the lifetime of components may differ up to two orders of magnitude, depending on the build orientation.

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“…The LPBF process of aluminum and aluminum alloys presents a number of challenges because of its high reflectivity and thermal conductivity and the necessity to use a high quality inert gas Metals 2017, 7, 68 2 of 9 environment during the building process [8,9]. Among commercial aluminum alloys, AlSi10Mg showed to be very suitable for AM technologies due to its composition close to the eutectic one which is responsible for its fine solidification range [10].…”

Section: Introductionmentioning

confidence: 99%

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

Aversa

Lorusso

Trevisan

et al. 2017

Metals

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A357 samples were realized by laser powder bed fusion (LPBF) on building platforms heated up to different temperatures. The effect of the preheating temperature and of the post processing heat treatment on the microstructure and the mechanical properties of the samples was studied. It was demonstrated that building platform heating can act as an in situ ageing heat treatment following the fast cooling that arises during laser scanning. A 17% higher ultimate tensile strength was achieved by the selection of the optimum building platform temperature. Moreover, the possibility to further increase the mechanical properties by means of a direct ageing heat treatment was investigated.

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Roughness modeling of AlSi10Mg parts fabricated by selective laser melting

Cited by 109 publications

References 20 publications

High cycle fatigue life estimation of AlSi10Mg processed by laser powder bed fusion

High cycle fatigue life estimation of AlSi10Mg processed by laser powder bed fusion

High cycle fatigue life estimation of materials processed by laser powder bed fusion

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

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