The Effect of Oxygen and Carbon on Molybdenum in Laser Powder Bed Fusion

J. Braun*, L. Kaserer, I. Letofsky-Papst, K. H. Leitz, H. Kestler, G. Leichtfried

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review


This paper presents molybdenum manufactured by Laser Powder Bed Fusion (LPBF) and the detrimental and positive effects of oxygen and carbon as its impurity and alloying element, respectively. The effects of manufacturing temperature, solidification mechanism, and grain boundary strength, are discussed. It was found that oxygen is responsible for the cracks in LPBF of molybdenum regardless of the processing temperature. Alloying molybdenum with 0.45 wt.% carbon diminishes the detrimental effects of oxygen by three effects: Firstly outgassing of carbon monoxide, secondly by increasing the grain boundary surface through constitutional undercooling and thirdly by trapping the oxygen within the carbide which has good coherency to the molybdenum matrix. The hardening effects of the finely dispersed carbide network must be overcome by building temperatures of 800 °C and higher to prevent cold cracking. The herein presented alloying and processing strategies enable molybdenum to be manufactured in LPBF free of cracks.

Original languageEnglish
Title of host publicationProceedings - Euro PM2020 Congress and Exhibition
PublisherEuropean Powder Metallurgy Association (EPMA)
ISBN (Electronic)9781899072514
Publication statusPublished - 2020
EventEuropean Powder Metallurgy Congress and Exhibition, Euro PM 2020 - Virtual, Online
Duration: 5 Oct 20207 Oct 2020

Publication series

NameProceedings - Euro PM2020 Congress and Exhibition


ConferenceEuropean Powder Metallurgy Congress and Exhibition, Euro PM 2020
CityVirtual, Online

ASJC Scopus subject areas

  • Mechanics of Materials
  • Metals and Alloys
  • General Materials Science

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)


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