The influence of surface roughness on the fatigue performance of selective laser melted aluminium alloy A357

Jeremy Heng Rao, Kai Zhang, Paul Rometsch, Aijun Huang, Xinhua Wu

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


As one of the most typical additive manufacturing (AM) technologies, selective laser melting (SLM) removes many of the shape restrictions that limit materials design, thereby allowing computationally optimised and high performance structures to be directly produced and tested. Due to the high reflectivity and lower absorptivity of Al alloy A357 powder during high temperature laser melting, one of the issues SLM might bring is the surface roughness and defects present on the parts. In this regard, this study investigates the surface roughness - fatigue property relationship for a heat-treated aluminium alloy A357 after SLM. Via the adjustment of SLM parameters, an ultrafine microstructure can be obtained due to the fast solidification rate. Therefore, comparable or even better mechanical properties can be achieved with respect to traditional A357 casting counterparts. Meanwhile, the surface roughness conditions of the SLMed Al alloy are also influenced by various processing parameters, raw powder properties, and sample building methods. For selective laser melted Al alloy A357 specimens, a dense part with a smoother surface would be expected to correspond with a good fatigue performance.
Original languageEnglish
Title of host publicationProceedings of the 16th International Aluminum Alloys Conference (ICAA16) 2018
PublisherCanadian Institute of Mining, Metallurgy and Petroleum
ISBN (Electronic)9781926872414
ISBN (Print)9781926872414
Publication statusPublished - 2018
EventInternational Conference on Aluminium Alloys (ICAA) 2018 - McGill University, Montreal, Canada
Duration: 17 Jun 201821 Jun 2018
Conference number: 16th


ConferenceInternational Conference on Aluminium Alloys (ICAA) 2018
Abbreviated titleICAA16
Internet address


  • Al-Si alloys
  • Microstructure
  • Heat treatment
  • Fatigue properties
  • Selective laser melting

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