Isothermal decomposition of austenite in steel 60N5

The Stability of Laser Hardening Structures to Softening During Heating

“…An increase in the tempering temperature above 550 о C leads to coagulation of the precipitates and a decrease in the hardness of the irradiated steel. These processes provide an increase in the heat resistance of the irradiated metal by 50-100 O C. It should be noted that the behavior of hardness during tempering of steels is determined both by hardening processes caused by precipitation of highly dispersed carbide phases and softening caused by relaxation of distortions of the martensite structure [8]. In this regard, when analyzing the obtained curves of the change in the hardness of irradiated steels, in addition to the two-phase decomposition of martensite and precipitation of carbides, in the presence of a high dislocation density, the possibility of polygonization and recrystallization processes in the zones of laser treatment was taken into account.…”

“…One of the main characteristics of steels, especially tool steels, is heat resistance, which has a decisive influence not only on the change in strength properties during operation, but also on such indicators as crumple resistance, wear resistance, heat resistance, etc. [1][2][3][4][5][6][7][8][9][10]. Determination of the resistance of structures obtained as a result of processing with highly concentrated energy flows to softening when heated to different tempering temperatures makes it possible to reliably differentiate the methods of surface hardening of steels by the temperature areas of operation of products of various functional purposes.…”