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The aim of this work was to study the effect of plastic deformation (0 70%) on the structure, chemical and phase composition, mechanical properties of surface layers formed in iron and iron-based alloys under alloying by nitrogen and carbon in ammonia and propane-butane environment with various ratios gaseous components at 853 K during 0.5-6 hours. Obtained surface layers were studied by means of X-ray diffraction, electrone probe analysis, Augerelectrone spectroscopy, microhardness and wear resistance tests. It was established that the surface layer after nitrogen and carbon saturation consists of epsilon-phase with the hexagonal closed packed crystal structure or thetaphase with the orthorhombic structure isostructural to cementite lattice and the solid solution of nitrogen and carbon in alpha-phase. The deformation within the range of 25 30 % essentially effects on the structure, phase and chemical composition and properties of surface layers. The theta-phase was revealed in the layer after such (25 30 %) deformation and saturation in gas mixture of 90 % ammonia and 10 % propane-butane. Obtained in this way layers show maximum microhardness, wear resistance and depth. The epsilon-phase was found in the alloy after deformation out of the 25 30 % ranges. The lattice period of the alpha-phase containing nitrogen and carbon decreases nonlinearly within the 25 40 % degree of plastic deformation. We assume that high mechanical properties of the surface layers results from participation of disperse carbonitrides on such crystal lattice defects as dislocations.

Deformation effect on structure and properties of surface layers in iron alloys under nitrogen and carbon alloying