Thermo-mechanical Fatigue Behaviour of AlSi7Mg Alloy Processed by Selective Laser Melting

Zahra Sajedi, Riccardo Casati, Maria Cecilia Poletti, Mateusz Skalon, Christof Sommitsch, Maurizio Vedani

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

Abstract

Heat treatable hypo-eutectic AlSi7Mg (A357) alloy is widely used for lightweight structural parts and for high temperature applications such as in cast cylinder heads.
AlSi7Mg is also a suitable alloy to be processed by selective laser melting (SLM), owing to its narrow solidification range, resistance to hot cracking and good fluidity. Employing SLM-processed parts made by AlSi7Mg in high temperature applications with cyclic thermal loads requires good resistance to thermo-mechanical fatigue due to the critical strains and stresses induced by the fluctuating temperature. In this study, the thermo-mechanical fatigue behaviour of A357 alloy samples produced by SLM has been investigated using a Gleeble®3800 simulator. A correlation has been found between the applied mechanical stress and thermo-mechanical fatigue life. Analyses on the mechanisms of failure allowed to draw conclusions about the relation between the thermo-mechanical fatigue strength and peculiar microstructure formed by SLM-processing.
Original languageEnglish
Title of host publicationEuro PM2019 - Congress and Exhibition
PublisherEuropean Powder Metallurgy Association
ISBN (Electronic)9781899072514
Publication statusPublished - 2019
EventEuro PM2019 - Congress and Exhibition - Maastricht , Netherlands
Duration: 13 Oct 201916 Oct 2019
https://www.europm2019.com/

Publication series

NameEuro PM 2019 Congress and Exhibition

Conference

ConferenceEuro PM2019 - Congress and Exhibition
CountryNetherlands
CityMaastricht
Period13/10/1916/10/19
Internet address

Keywords

  • AlSi7Mg
  • Damage mechanisms
  • Selective laser melting
  • Thermo-mechanical fatigue

ASJC Scopus subject areas

  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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