Speaker
Dr
Schadrack Nsengiyumva
(Rhodes University)
Description
The influence of hydrogenation on residual stresses in oxygen-implanted Ti-6Al-4V alloy is reported. Prior to hydrogenation, oxygen ions were implanted in Ti-6Al-4V samples at fluence 3x1017 ions/cm2 with energies 50 keV at room temperature and 5500C, 100 keV and 150 keV at 5500C. Hydrogenation was carried out on all samples at 5500C for two hours. Residual stresses were analysed by X-ray diffraction using the sin2 in conjunction with LEPTOS v6 data reduction. Our results show stress relaxation in samples implanted with 50 keV and 100 keV with respect to unimplanted sample. However, samples implanted with 150 keV show tensile stress state. Subsequent to hydrogenation, a change in stress for samples implanted with 50 keV and 100 keV is observed whereas stress in samples implanted with 150 keV becomes more tensile.
Primary author
Dr
Schadrack Nsengiyumva
(Rhodes University)
Co-author
Mr
Tshepo Ntsoane
(Necsa)
