Abstract
AISI 316 L stainless steels type was surface modified by ion and solid nitriding treatment. It was demonstrated that a surface activation pretreatment in samples based in acid mixture accompanied with NH4NO3 solution inside the container, can produce an efficient nitrogen diffusion process. As compared with ion nitriding treatment (20%N2-80%H2), the samples were treated with solid nitriding technique, using Fe4KCN based compound at the same time and temperature (6 h and 500°C respectively). Superficial layers with a depth of 45 μm average were obtained with six hours treatment. Hardness surface values of two surface treatments present an increased value of approximately three times with respect to the matrix sample. Wear evaluation indicated low regimes of weight losses for both treatments. Oxidative-adhesive result is to be the predominant operating wear mechanism. Positive results were obtained in solid nitriding technique as compared with the expensive ion nitriding technique.
Highlights
Strengthened tools and components are necessaries for industrial applications in several processes, where exists a relative contact between surfaces
These results show a nitrogen diffusion of almost 50 percent more for the ion nitriding sample in comparison with the solid nitrided samples
It is noticeable that sample with solid nitriding treatment at this nitrogen concentration, presents an improved diffusion behavior, it can be attributed to the nitrogen rich atmosphere generated inside the container which come from the reactant and the internal ammonia nitrate coating, generating a strong influence in the diffusion process with the consecutive formation of nitrides and carbides and carbonitrides with the elements alloy present in the steel [11]
Summary
Strengthened tools and components are necessaries for industrial applications in several processes, where exists a relative contact between surfaces. It has been reported that the main cause for the hardness increment in nitrided steels is produced mainly by the nitrides precipitated during the process [1] This is because nitriding reaction occurs on the surface sample, and simultaneously in the subsurface, due to the continuous diffusion of nitrogen atoms. Surface modification about stainless steels has been extensively developed, providing important information about the nitrided layer for different applications [5] [6] [7]. Results were focused in show that solid nitriding can be an accessible and no expensive surface treatment to obtain hardened layers in many components, used carefully (because is not a green process) when ion nitriding treatment is not accessible
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