The choice of the optimal temperature and time parameters of gas nitriding of steel

Development of the combined hardening technology of obtaining solid coating on the surface of steel products

“…However, this process is limited by temperature regimes and the inability of local hardening that do not allow sufficiently specific to provide performance characteristics with minimal power consumption. A similar circumstance is mentioned in [6][7][8][9], which concluded a necessity of compromise solutions that improve the durability of machine parts without the use of complicated special equipment. The authors have shown that this approach provides a suitable practical result, but naturally restriction on its use is non-locality of the hardening.…”

“…-Innovative methods of chemical and thermal treatment [5][6][7][8][9]; -Laser treatment [10][11][12]; -Combined methods of surface hardening [13][14][15].…”

Development of a combined technology for hardening the surface layer of steel 38Cr2MoAl

“…A detailed description of the preliminary laser treatment was given in [17]. As is well known ( [8,12]), the optimal nitriding temperature is 550 °C. Therefore, variation of Table 1 Chemical composition of steels nitriding duration was of particular interest for analysis of the effect of nitriding on thickness of the hardened layer and microhardness of the surface layers.…”

“…One of the most common technologies for hardening steel surface is nitriding but this is a fairly lengthy and expensive process [8]. Therefore, a rational solution will be development of a combined method for hardening surface layer of steel aimed at acceleration of the nitriding process.…”

Development of an iron-based alloy with a high degree of shape recovery

“…Experiment on corrosion resistance [21] of the alloy was conducted by weight method in a 10 % solution of sulphuric acid.…”