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Effects of rapid, high-dose, elevated temperature ion implantation on the microstructure and tribology of ferrous surfaces

1991; Elsevier BV; Volume: 56-57; Linguagem: Inglês

10.1016/0168-583x(91)96111-w

1872-9584

D. L. Williamson, Ronghua Wei, Paul J. Wilbur,

Advanced materials and composites

Abstract High-current, broad-beam ion implantation at 60 keV using a relatively simple system produces elevated target temperatures and results in remarkable enhancements in the wear resistance of ferrous materials compared to lower implantation temperatures. Effects of N, C and O implantation into AISI 304 stainless steel at 200 and 400°C on the microstructure and tribology are evaluated by conversion electron Mossbauer spectroscopy, X-ray diffraction, and a specially designed pin-on-disc tribotester. C and N implantation at 400°C yields unusually thick layers of austenite containing high concentrations of C and N in interstitial solid solution thereby accounting for the enhanced mechanical properties. O implantation at 400°C results in Fe 2 O 3 -like oxide rather than O in solid solution so a dispersion strengthening of the surface layer is suggested.