Effect of cryogenic grinding on fatigue life of additively manufactured maraging steel

Arunachalam S. S. Balan, Kannan Chidambaram, Arun V. Kumar, Hariharan Krishnaswamy, Daniel Yurievich Pimenov, Khaled Giasin, Krzysztof Nadolny

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Abstract

Additive manufacturing (AM) is replacing conventional manufacturing techniques due to its ability to manufacture complex structures with near-net shape and reduced material wastage. However, the poor surface integrity of the AM parts deteriorates the service life of the components. The AM parts should be subjected to post-processing treatment for improving surface integrity and fatigue life. In this research, maraging steel is printed using direct metal laser sintering (DMLS) process and the influence of grinding on the fatigue life of this additively manufactured material was investigated. For this purpose, the grinding experiments were performed under two different grinding environments such as dry and cryogenic conditions using a cubic boron nitride (CBN) grinding wheel. The results revealed that surface roughness could be reduced by about 87% under cryogenic condition over dry grinding. The fatigue tests carried out on the additive manufactured materials exposed a substantial increase of about 170% in their fatigue life when subjected to cryogenic grinding.
Original languageEnglish
Article number1245
Number of pages16
JournalMaterials
Volume14
Issue number5
DOIs
Publication statusPublished - 5 Mar 2021

Keywords

  • maraging steel
  • additive manufacturing
  • cryogenic grinding
  • residual stress
  • surface roughness
  • fatigue
  • microhardness

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