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• W2560277514 abstract "The aim of the present work is to study the effect of phase transformations on the mechanical properties of steel 45 treated by laser. A coating was applied to flat specimens with a cross section of 3.5 x 13 mm and a gauge length of 40 mm intended for tensile testing in order to increase laser irradiation absorption. Laser treatment followed by cooling was applied to the surface of the wide faces of specimens along the tensile axis. An increase in the number of passes increased the proportion of hardened material participating in tests. Treatment was carried out with a laser beam power of 800 W, beam diameter 3.6 mm, and at a rate of 20 mm/sec. Tensile testing was carried out in an FP-100 rupture machine. Hardened specimens after laser treatment and mechanical testing were cut across the tracks of radiation with the material in order to evaluate phase changes in their surface layer. After etching microsections with 4% picric acid solution the microstructure of specimens was studied in a Leitz structural analyzer by the procedure in [4]. As studies showed, as a result of laser treatment after cooling in air two zones form in the specimen surface layer, i.e., a fusion zone (quenching from the liquid condition) and a heat-affected zone (quenching from the solid state), which have a transitional (towards the core) region consisting of an austenite-martensite mixture and a ferrite network. Shown in Fig. I is the change in structure through the thickness of the hardened zone. The fusion region is fine (5-15 ~m) dendrites assembled into packets whose size corresponds to the primary austenite grains. Dendrite crystallization proceeds, as it were, in a of austenite grains with a diameter of 15-30 ~m of the heat-affected zone. With an increase in distance from the surface these grains increase in size and reach 27-36 ~m in cross section, changing into grains bordered by the ferritic network. The most complete information about the effect of laser treatment regimes on the degree of completion of phase transformation in the hardened zone may be obtained from quantitative characteristics of the microstructure (Table I). With an increase in laser radiation power during treatment there is an increase in the size of austenite grains of the substrate and dendrites of the fusion zone. An increase in treatment rate causes dispersion of the substrate structure, which is connected with an increase in the cooling rate for the area irradiated by the laser. Dendrites of minimum size form with a treatment rate of v = 20 mm/sec, and this is explained by the fact that the dependence of structure dispersivity on cooling rate during crystallization has a maximum corresponding to the critical cooling rate for a given alloy [5]." @default.
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• W2560277514 date "1989-01-01" @default.
• W2560277514 modified "2023-09-26" @default.
• W2560277514 title "LASER TREATMENT AND SUBSEQUENT DEFORMATION" @default.
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