Impacts of defocusing amount and molten pool boundaries on mechanical properties and microstructure of selective laser melted AlSi10Mg

Zhou, S, Su, Y, Gu, R, Wang, Z, Zhou, Y, Ma, Q and Yan, M 2018, 'Impacts of defocusing amount and molten pool boundaries on mechanical properties and microstructure of selective laser melted AlSi10Mg', Materials, vol. 12, no. 1, pp. 1-14.


Document type: Journal Article
Collection: Journal Articles

Attached Files
Name Description MIMEType Size
n2006089389.pdf Published Version application/pdf 7.22MB
Title Impacts of defocusing amount and molten pool boundaries on mechanical properties and microstructure of selective laser melted AlSi10Mg
Author(s) Zhou, S
Su, Y
Gu, R
Wang, Z
Zhou, Y
Ma, Q
Yan, M
Year 2018
Journal name Materials
Volume number 12
Issue number 1
Start page 1
End page 14
Total pages 14
Publisher M D P I AG
Abstract The influences of processing parameters such as volumetric energy density (ε) and, particularly, defocusing amount (DA) on densification, microstructure, tensile property, and hardness of the as-printed dense AlSi10Mg alloy by selective laser melting (SLM) were studied systematically. The molten pool boundaries (MPBs) were found overwhelmingly at regular and complex spatial topological structures affected by DA value to exist in two forms, while the "layer-layer" MPB overlay mutually and the "track-track" MPBs intersect to form acute angles with each other. The microstructure of MPBs exhibits a coarse grain zone near the MPBs and the characteristics of segregation of nonmetallic elements (O, Si) where the crack easily happened. The DA value (-2 to 2 mm) affected both the density and the tensile mechanical properties. High tensile strength (456 ± 14 MPa) and good tensile ductility (9.5 ± 1.4%) were achieved in the as-printed condition corresponding to DA = 0.5 mm. The tensile fracture surface features were analyzed and correlated to the influence of the DA values.
Subject Metals and Alloy Materials
Keyword(s) Aluminum alloys
Mechanical properties
Selective laser melting (SLM)
DOI - identifier 10.3390/ma12010073
Copyright notice © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
ISSN 1996-1944
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 0 times in Thomson Reuters Web of Science Article
Scopus Citation Count Cited 0 times in Scopus Article
Altmetric details:
Access Statistics: 14 Abstract Views, 6 File Downloads  -  Detailed Statistics
Created: Thu, 21 Feb 2019, 12:10:00 EST by Catalyst Administrator
© 2014 RMIT Research Repository • Powered by Fez SoftwareContact us