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Nitrogen ion implantation with different dose rates was conducted on 8Cr4Mo4V-bearing steel in the present study. The effects of high-dose-rate nitrogen plasma immersion ion implantation (N-PIII) on the microstructure and nanohardness of the 8Cr4Mo4V-bearing steel were studied. The surface morphology, phase microstructure, lattice parameters and nanohardness were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and nanoindentation tests. The results showed that finer crystallite size, higher micro-strain and dislocation density can be achieved under high-dose-rate ion implantation and the dislocation density reaches the highest level of 1.71 × 10 16  m −2  at a dose rate of 5.23 × 10 17  ions cm −2  h −1 . In addition, the high-dose-rate ion implantation results in changes in phase composition in the surface layer, and the Fe(M) peaks slightly shift to a lower angle. Moreover, the nanohardness of implanted samples improved notably, especially at a dose rate of 8.64 × 10 17  ions cm −2  h −1 , reaching the high value of 15.8 GPa, which is 42.1% higher than that of a non-implanted sample (11.1 GPa), implying that the properties of the samples were strongly affected by the implantation dose rate of nitrogen.

Effects of microstructure and nanohardness of 8Cr4Mo4V steel under high-dose-rate N-PIII