Title:
Qualification of laser powder bed fusion processed 17-4 PH stainless steel as a function of powder condition

dc.contributor.advisor Saldaña, Christopher J.
dc.contributor.advisor Kurfess, Thomas R.
dc.contributor.author Berez, Jaime Michael Schnaier
dc.contributor.committeeMember Fu, Katherine
dc.contributor.committeeMember Ramakrishnan, Ramesh
dc.contributor.department Mechanical Engineering
dc.date.accessioned 2020-09-08T12:47:42Z
dc.date.available 2020-09-08T12:47:42Z
dc.date.created 2020-08
dc.date.issued 2020-07-21
dc.date.submitted August 2020
dc.date.updated 2020-09-08T12:47:42Z
dc.description.abstract The metal additive manufacturing process of laser powder-bed fusion (LPBF) presents a challenge to develop qualified processes to match the rapid pace of technology development. An aspect of the LPBF process where this applies is defining the how powder feedstock conditions affect the quality of produced components. This study examines how in-machine powder feedstock supplies evolve and are otherwise affected during the LPBF process, and how these effects impact subsequent builds which use said feedstock. An examination of powder flowability, rheology, and morphology is conducted to characterize the powder conditions. To study the effects, an assessment of produced component tensile, fatigue, and microstructural properties is conducted. Fatigue life is analyzed using a reliability modeling approach in order to provide detailed statistical conclusions often missing in other analyses. Powders are found to evolve their characteristics over exposure to repeated LPBF processes, particularly in the extremes of powder size distribution and measures of bulk flow. No significant effects on microstructural, hardness, tensile, and fatigue properties of the produced components are shown. Fatigue life is discovered to exhibit a dependence on spatial origin of the produced component. Additionally, a detailed characterization of the scatter in fatigue life typical to the process and material is provided.
dc.description.degree M.S.
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/63657
dc.language.iso en_US
dc.publisher Georgia Institute of Technology
dc.subject Additive manufacturing
dc.subject AM
dc.subject Laser powder bed fusion
dc.subject LPBF
dc.subject Selective laser melting
dc.subject SLM
dc.subject Powder
dc.subject Flowability
dc.subject 17-4
dc.subject Fatigue
dc.subject Reliability modeling
dc.subject Qualification
dc.title Qualification of laser powder bed fusion processed 17-4 PH stainless steel as a function of powder condition
dc.type Text
dc.type.genre Thesis
dspace.entity.type Publication
local.contributor.advisor Kurfess, Thomas R.
local.contributor.advisor Saldaña, Christopher J.
local.contributor.corporatename George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication 1fae7587-6ed2-4214-b785-8741ad9f465a
relation.isAdvisorOfPublication 6a3b202b-a552-45bf-a034-0b8e33c4a6bb
relation.isOrgUnitOfPublication c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
thesis.degree.level Masters
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