In this work, the effect of nano-grain structure refinement in 316LVM austenitic stainless steel on the layers formed in glow-discharge low-temperature nitriding process was investigated. The material used in this work was 316LVM ASS in the following microstructural states: coarse grained (after annealing), plastic deformed (after conventional extrusion), nanocrystalline (after hydrostatic extrusion). All samples were subjected to glow-discharge low-temperature nitriding process at a temperature of 350 °C.

The results show significant influence of the structure nanorefinement on the nature of layers formed in low-temperature nitriding process, in particular on the surface topography, thickness, phase composition and the content of nitrogen. The effect of nanoscale structure on diffusion and surface layers formation is discussed.

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