Process influences on laser-beam melting of the magnesium alloy AZ91

Dominik Schmid, Johanna Renza, Michael F. Zaeh, Johannes Glasschroeder

Research output: Contribution to journalConference articlepeer-review

21 Scopus citations

Abstract

Magnesium's great lightweight potential and high biocompatibility render laser-beam melting of this metal increasingly interesting. Despite recent research activities in this field, the properties thereby achieved are still inadequate for industrial or medical use. Low surface quality caused by powder sintered to parts' boundaries is one of the main problems. This effect is discussed theoretically and examined on single tracks of the magnesium alloy AZ91. Welding-penetration depth and width was measured on a magnesium plate with and without a powder layer. For the derivation of suitable process parameters, structures with incrementally increasing hatch distances were built and microscopically analyzed. The influence on defect percentage and hardness of the parts was determined based on specimens manufactured with different layer thicknesses. The influence of the oxygen content on solids was analyzed by varying the process atmosphere.

Original languageEnglish
Pages (from-to)927-936
Number of pages10
JournalPhysics Procedia
Volume83
DOIs
StatePublished - 2016
Event9th International Conference on Photonic Technologies, LANE 2016 - Furth, Germany
Duration: 19 Sep 201622 Sep 2016

Keywords

  • laser beam melting
  • layer thickness
  • magnesium
  • residual oxygen content
  • selective laser melting
  • single tracks
  • sintering

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