Analysing size and shape of internal processing defects within selective laser melted aluminium alloy using x-ray micro computed tomography

James C Hastie*, Mehmet E Kartal, Moataz M Attallah, Luke N Carter

*Corresponding author for this work

Research output: Contribution to conferenceAbstractpeer-review

Abstract

Metallic components produced by additive manufacturing (AM) processes, including selective laser melting (SLM), have largely been limited to non-critical applications due to a lack of understanding of mechanical behaviour and microstructural quality. The internal micro porosity of parts produced by SLM is governed by feedstock (powdered) material properties, scanning strategy and a number of processing parameters i.e. laser power, speed of scan etc. Traditionally cast aluminium alloys such as AlSi10Mg are extensively used in automotive and aerospace applications and are widely considered as candidates for SLM. However, high reflectivity and thermal conductivity make their processing by laser especially challenging. In order to fully understand the influence of key processing parameters on the internal microstructure of SLM’d AlSi10Mg, it is necessary to categorise pore size and shape morphology in 3D. In the current work, AlSi10Mg alloy samples were manufactured by SLM using 30 unique combinations of laser power (150, 250, 350W), scanning speed (500, 1500, 2500mm/s), hatch spacing (0.3, 0.5, 0.7mm) and layer thickness (30, 60μm), covering a range of very low (68.64%) to very high (99.78%) densifications. Internal processing defects (pores) were analysed using high resolution X-ray micro computed tomography (XμCT). The influence of processing parameters on 3D porosity % and pore size/shape distribution was evaluated.
Original languageEnglish
Pages49-49
Number of pages1
Publication statusPublished - 20 Sep 2019
EventAlloys for Additive Manufacturing Symposium 2019 - Chalmers University of Technology, Gothenburg, Sweden
Duration: 18 Sep 201920 Sep 2019
http://www.chalmers.se/en/centres/cam2/conferences%20and%20events/conference%20AAMS2019/Pages/default.aspx

Conference

ConferenceAlloys for Additive Manufacturing Symposium 2019
Country/TerritorySweden
CityGothenburg
Period18/09/1920/09/19
Internet address

Fingerprint

Dive into the research topics of 'Analysing size and shape of internal processing defects within selective laser melted aluminium alloy using x-ray micro computed tomography'. Together they form a unique fingerprint.

Cite this