Density and specific heat of nitrided structural steel. Physical and mechanical properties.
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The role of nitrided layer in the work of products
For the production of friction pairs in engineering, various steels with and without coatings are used. In particular, parts with a high hardness of interacting surfaces are used for the production of open friction pairs (for example, gears, gearboxes for hoisting and transport devices, etc.). For closed friction pairs (slide bearings, etc.) — one of the surfaces contacted together usually has a lesser hardness. This is necessary for accelerated run-in, in the contact zone, during which the macro-irregularities of the surface are smoothed out, and the optimum value of their roughness is formed, which ensures sufficient wear resistance of the friction pair. In closed gears (for example, in the drive of machines and press equipment) it is desirable to concentrate frictional and tribological processes in a thin surface layer that has constant strength under cyclic loading conditions. In this case, it is necessary to provide surface protection with oxide films, which take on most of the operational loads.
The company «Elektrovek-steel» offers nitrided structural steels at affordable prices. The supplier guarantees prompt delivery of products to the point specified by the customer.
Properties of nitrided layer
After nitriding of structural alloy steels their following characteristics change:
Resistance to fatigue failure. When nitriding, residual compressive stresses occur, which in thin, near-surface layers reach 350… 400 MPa. They increase the strength of the product, which is used for cyclic loading. At the same time, the danger of the formation and development of microcracks is reduced;
Contact endurance, which is increased due to the formation of martensitic structure in nitrided steels. The distribution of stresses arising during operation is such that the greatest values of contact loads do not come to the surface, but to some depth below it. A high level of contact endurance of the surface of parts is determined only by chemical-thermal treatment, in which a zone of nitrogen-containing martensite is created in the subsurface layers;
Corrosion resistance. Metal nitrides are much more resistant to oxidation than conventional metals and steels. Corrosion resistance is maintained even at elevated temperatures up to 500… 550 0 С, as well as in atmospheres with high humidity. To achieve a greater effect, nitriding of structural alloyed steels is often performed in multiphase systems where complex nitride coatings are formed;
Heat resistance. With nitriding, the prevailing plastic deformation resistance at elevated operating temperatures is provided by the internal nitriding zone. In this case, the zone of passage of recrystallization processes shifts by 240… 280 0 С, which increases the stability of nitrides, thereby increasing the creep limit.
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