Refinement of solidification microstructures by carbon addition in biomedical Co-28Cr-9W-1Si alloys

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Abstract

The solidification microstructures of Co-28Cr-9W-1Si (wt%) alloys with different carbon contents (0.005-0.33 wt%) were characterized using scanning electron microscopy, electron backscatter diffraction, and electron probe microanalysis. The as-cast alloys exhibited cellular dendritic microstructures, and the amount of grain boundary carbide precipitates increased with increasing carbon concentration. It was revealed that the interdendritic segregation of Cr, W, Si, and C, resulted in interdendritic precipitation. Consequently, adding carbon was found to decrease the grain sizes of as-cast alloys. Our results will contribute to the development of disk materials made of biomedical Ni-free Co-Cr-W-based alloys with refined grain sizes.

Original languageEnglish
Pages (from-to)82-85
Number of pages4
JournalMaterials Letters
Volume116
DOIs
Publication statusPublished - 2014 Jan 1

Keywords

  • Biomaterials
  • Grain boundaries
  • Microstructure
  • Segregation
  • Solidification
  • Structural

ASJC Scopus subject areas

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

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