Fatigue of AlSi10Mg specimens fabricated by additive manufacturing selective laser melting (AM-SLM)

Naor Elad Uzan, Roni Shneck, Ori Yeheskel, Nachum Frage

Research output: Contribution to journalArticlepeer-review

148 Scopus citations

Abstract

The fatigue resistance of AM-SLM AlSi10Mg samples built in the Z direction after various heat treatments was investigated. Specimens were tested in the as-built (AB) condition, after stress relief (SR) treatment and after SR and hot isostatic pressing (HIP) at either 250 °C or 500 °C. The AB machined and polished specimens displayed the highest fatigue limit (Sf = 125 MPa, Nf = 107 cycles). SR and HIP cycles decrease the yield strength, hardness and fatigue limit. The SR and HIP treatment at 500 °C resulted in the lowest fatigue resistance due to significant microstructural changes. A relation between the yield stress and fatigue resistance was established. Linear elastic fracture mechanics were employed for evaluating fracture surface morphology. Based on the results of fracture surface characterization, values of the critical stress intensity factor (Kcr) for AM-SLM AlSi10Mg specimens after various heat treatments were estimated.

Original languageEnglish
Pages (from-to)229-237
Number of pages9
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume704
DOIs
StatePublished - 17 Sep 2017

Keywords

  • Additive manufacturing
  • AlSi10Mg
  • Fatigue
  • Fractography
  • Fracture toughness
  • Hot isostatic pressing
  • Tensile properties

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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