Engineering of Temperature Profiles for Location-Specific Control of Material Micro-Structure in Laser Powder Bed Fusion Additive Manufacturing

Bibliographic Details
Main Author:	Lewandowski, George
Language:	English
Published:	University of Dayton / OhioLINK 2020
Subjects:	Optics Laser powder bed fusion Numerical optimization Laser additive manufacturing Material micro-structure control Engineering of temperature profiles
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=dayton1588940683690978

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-dayton15889406836909782021-08-03T07:15:00Z Engineering of Temperature Profiles for Location-Specific Control of Material Micro-Structure in Laser Powder Bed Fusion Additive Manufacturing Lewandowski, George Optics Laser powder bed fusion Numerical optimization Laser additive manufacturing Material micro-structure control Engineering of temperature profiles This work explores new capabilities of recently emerged adaptive multi-beam laser power sources to optimally shape laser power spatial distribution at powder material during metallic laser powder bed fusion additive manufacturing. Conventional laser additive manufacturing (LAM) systems use a highly localized laser beam for powder material melting resulting in strong temperature gradients inside the heat affected zone (HAZ) leading to formation of columnar material grain structure having highly anisotropic mechanical properties. Beam shaping with multi-beam laser power source provides opportunities for on demand and location-specific altering grain structure from columnar to equiaxed resulting in more isotropic mechanical properties of LAM fabricated parts. In this work we perform numerical simulations of theLAM process using a reduced complexity analytical heat transfer solution in order to optimize multi-beam configurations leading to the desired transitioning from columnar to equiaxed grain morphology. The beam shaping optimization was performed using a stochastic parallel gradient descent optimization of the introduced performance metrics. The results demonstrate the possibility to significantly increase the fraction of equiaxed grains in the solidified powder material using optimal positioning and laser power control of multiple laser focal spots during LAM. 2020-06-15 English text University of Dayton / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=dayton1588940683690978 http://rave.ohiolink.edu/etdc/view?acc_num=dayton1588940683690978 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Optics Laser powder bed fusion Numerical optimization Laser additive manufacturing Material micro-structure control Engineering of temperature profiles
spellingShingle	Optics Laser powder bed fusion Numerical optimization Laser additive manufacturing Material micro-structure control Engineering of temperature profiles Lewandowski, George Engineering of Temperature Profiles for Location-Specific Control of Material Micro-Structure in Laser Powder Bed Fusion Additive Manufacturing
author	Lewandowski, George
author_facet	Lewandowski, George
author_sort	Lewandowski, George
title	Engineering of Temperature Profiles for Location-Specific Control of Material Micro-Structure in Laser Powder Bed Fusion Additive Manufacturing
title_short	Engineering of Temperature Profiles for Location-Specific Control of Material Micro-Structure in Laser Powder Bed Fusion Additive Manufacturing
title_full	Engineering of Temperature Profiles for Location-Specific Control of Material Micro-Structure in Laser Powder Bed Fusion Additive Manufacturing
title_fullStr	Engineering of Temperature Profiles for Location-Specific Control of Material Micro-Structure in Laser Powder Bed Fusion Additive Manufacturing
title_full_unstemmed	Engineering of Temperature Profiles for Location-Specific Control of Material Micro-Structure in Laser Powder Bed Fusion Additive Manufacturing
title_sort	engineering of temperature profiles for location-specific control of material micro-structure in laser powder bed fusion additive manufacturing
publisher	University of Dayton / OhioLINK
publishDate	2020
url	http://rave.ohiolink.edu/etdc/view?acc_num=dayton1588940683690978
work_keys_str_mv	AT lewandowskigeorge engineeringoftemperatureprofilesforlocationspecificcontrolofmaterialmicrostructureinlaserpowderbedfusionadditivemanufacturing
_version_	1719457111228809216

Engineering of Temperature Profiles for Location-Specific Control of Material Micro-Structure in Laser Powder Bed Fusion Additive Manufacturing

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