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Investigation of the Selective Laser Melting Process for AlSi10mg and Al-Mg-Si Alloys Fabricated at High Laser Power.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Investigation of the Selective Laser Melting Process for AlSi10mg and Al-Mg-Si Alloys Fabricated at High Laser Power./
作者:	Pires, Michael.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	56 p.
附註:	Source: Masters Abstracts International, Volume: 82-12.
Contained By:	Masters Abstracts International82-12.
標題:	Engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28496697
ISBN:	9798515271619

Investigation of the Selective Laser Melting Process for AlSi10mg and Al-Mg-Si Alloys Fabricated at High Laser Power.
Pires, Michael.

Investigation of the Selective Laser Melting Process for AlSi10mg and Al-Mg-Si Alloys Fabricated at High Laser Power. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 56 p.

Source: Masters Abstracts International, Volume: 82-12.

Thesis (M.S.)--Lehigh University, 2021.

This item must not be sold to any third party vendors.

Selective Laser Melting (SLM), a powder-bed fusion additive manufacturing technique, of AlSi10Mg and Al-Mg-Si (AA6061) alloys is challenging in producing sound parts due to low powder flowability and high thermal conductivity of aluminum. Three-dimensional printing in machines with higher laser powers creates new microstructures, which are not fully understood. This project investigated aluminum alloy parts printed using laser powers ranging from 200 to 400 Watts. The research objective was to establish the relationship between laser power and the resulting microstructure obtained in the as-built condition using a Renishaw AM400 unit. Thirty-six 10 x 10 x 10 mm3 solid cube samples were printed using AlSi10Mg and AA6061 powders with variation in processing parameters such as laser power and layer height, among others. The density of each sample was determined using the Archimedes method and light optical microscopy (LOM). A density > 97% was observed for both alloys at optimized conditions. Metallographic analysis determined optimum build parameters and characterized the melt pool boundaries (MPB) and porosity formed in the SLM process. Different causes of porosity formation were identified throughout the microstructure as metallurgical factors, keyhole mode melting, and propagating cracks. Three-dimensional energy density input during the SLM process and alloying content of the powder were found to play a key role in the solidification behavior of each sample. Scanning electron microscopy and X-ray energy dispersive spectrometry were used to qualitatively characterize microstructural features and defects, such as cracks. Overall, presence of solidification and liquation cracking was found within the Al-Mg-Si system. Microhardness results determined both alloys performed as previously reported in literature. Overall, optimal processing parameters for the Al-Mg-Si alloy (AA6061) have not been achieved up to this point and require further investigation.

ISBN: 9798515271619Subjects--Topical Terms:

586835
Engineering.
Subjects--Index Terms:

Selective Laser Melting

Investigation of the Selective Laser Melting Process for AlSi10mg and Al-Mg-Si Alloys Fabricated at High Laser Power.
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520 $a Selective Laser Melting (SLM), a powder-bed fusion additive manufacturing technique, of AlSi10Mg and Al-Mg-Si (AA6061) alloys is challenging in producing sound parts due to low powder flowability and high thermal conductivity of aluminum. Three-dimensional printing in machines with higher laser powers creates new microstructures, which are not fully understood. This project investigated aluminum alloy parts printed using laser powers ranging from 200 to 400 Watts. The research objective was to establish the relationship between laser power and the resulting microstructure obtained in the as-built condition using a Renishaw AM400 unit. Thirty-six 10 x 10 x 10 mm3 solid cube samples were printed using AlSi10Mg and AA6061 powders with variation in processing parameters such as laser power and layer height, among others. The density of each sample was determined using the Archimedes method and light optical microscopy (LOM). A density > 97% was observed for both alloys at optimized conditions. Metallographic analysis determined optimum build parameters and characterized the melt pool boundaries (MPB) and porosity formed in the SLM process. Different causes of porosity formation were identified throughout the microstructure as metallurgical factors, keyhole mode melting, and propagating cracks. Three-dimensional energy density input during the SLM process and alloying content of the powder were found to play a key role in the solidification behavior of each sample. Scanning electron microscopy and X-ray energy dispersive spectrometry were used to qualitatively characterize microstructural features and defects, such as cracks. Overall, presence of solidification and liquation cracking was found within the Al-Mg-Si system. Microhardness results determined both alloys performed as previously reported in literature. Overall, optimal processing parameters for the Al-Mg-Si alloy (AA6061) have not been achieved up to this point and require further investigation.
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