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Effect of hatch distance in laser powder bed fusion of stainless steel 316L
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-2560-5703
2021 (English)In: First EEIGM International Online Conference on Materials Science and Engineering, Scientific Programme - Book of Abstracts, 2021Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

Laser powder bed fusion (L-PBF) is an innovative manufacturing technique that produces complex and high accuracy components by melting of powder layer-by-layer [1]. However, defects formed during the manufacturing process affect the mechanical properties of a component [2]. To avoid the defects, remelting of tracks is required and thus low process efficiency [3]. In Figure 1 (a) case of cavity formation in which Ac is, the area of the cavity and Av is remelting vertically area of cross-section, and AT is newly generated area of cross-section. (b) The cross-section of melt track is calculated from modeling in which different shades of yellow show the number of remelting during the building of the new track. In this study five samples of 316L stainless steel with hatch distance 20 μm, 50 μm, 80 μm, 110 μm, and 140 μm are studied. EBSD and nanoindentation hardness are used to understand the correlation between hatch distance and microstructure including crystallographic orientation and hardness. MIPAR image analysis software is used to calculate porosity and distinguish different types of defects such as lack of fusion, gas pores, and keyhole defects.

Place, publisher, year, edition, pages
2021.
National Category
Manufacturing, Surface and Joining Technology
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-97923OAI: oai:DiVA.org:ltu-97923DiVA, id: diva2:1763013
Conference
First EEIGM International Online Conference On Materials Science And Engineering, April 22-23, 2021, Online
Available from: 2023-06-06 Created: 2023-06-06 Last updated: 2023-06-28Bibliographically approved

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Mishra, Pragya

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