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Research results of structure and select properties (hardness, impact strength, wear resistance) carburized parts and tempered in three different cooling media: water, oil and aqueous polymer solutions are discussed. These results showed that structure and properties of case and core of carburized part is most profitable after using an aqueous polyalkylene glycol - PAG polymer solutions.

Atmosphere carburizing remains one of the most important surface treatment technologies throughout the world. In this paper, various important metallurgical design variables are identified by examining the results of the carburisation of 15HN steel. These results showed the importance of the formation of martensite-retained austenite-carbide microstructure after hardening. Increasing austenization temperature causes a decrease in the carbide fraction and an increase in the fraction of retained austenite. By optimisation of the composition of these microstructures through variation of carburisation process, hardening, and tempering variables, it is possible to optimise compressive stresses, abrasive wear resistance, and contact fatigue resistance.

The effect phase composition of carburized constructional steels with a particular focus on the influence of retained austenite and carbides on hardness, impact strength and wear resistance is described. It is shown that increasing retained austenite and carbide content of the hardened carburized layers exhibits useful properties.