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Effect of cryogenic burnishing on surface integrity modifications of Co‐Cr‐Mo biomedical alloy
Author(s) -
Yang Shu,
Dillon Oscar W.,
Puleo David A.,
Jawahir Ibrahim S.
Publication year - 2013
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.32827
Subject(s) - burnishing (metal) , materials science , surface integrity , metallurgy , alloy , severe plastic deformation , surface layer , liquid nitrogen , recrystallization (geology) , corrosion , residual stress , composite material , layer (electronics) , paleontology , physics , quantum mechanics , polishing , biology
Severe plastic deformation (SPD) processes have been used to modify the surface integrity properties of many materials by generating ultrafine or even nanometer‐sized grains in the surface and subsurface region. These fine grained materials created by SPD and dynamic recrystallization in a thin layer near the surface usually have higher hardness and frequently exhibit enhanced mechanical properties (wear resistance, corrosion resistance, fatigue life, etc.). Cryogenic burnishing, a SPD process, was used to improve several surface integrity parameters of a Co‐Cr‐Mo biomedical alloy. Application of liquid nitrogen during the burnishing process significantly suppressed the temperature rise within and outside the nitrogen application zone. Better surface finish, high hardness value, thick burnishing‐influenced surface layer, and significant grain refinement were simultaneously achieved with the application of cryogenic cooling. Current results show that cryogenic burnishing can be an effective processing method for modifying the studied surface integrity properties of Co‐Cr‐Mo biomedical alloy. © 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 101B: 139–152, 2013.