The laser-plasma cementation as a method of increasing the abrasive resistance of medium-alloy tool steels

Abstract

The paper is devoted to the study of resistance of medium alloy tool steels after laser-plasma cementation. The authors propose a method of increasing abrasive resistance by means of the combined effect of DC electric arc of reverse polarity and laser radiation. The increased concentration of carbon in the near-surface layer is provided by the erosion of the carbon electrode and melting due to the combined energy effect of laser radiation and electric arc. The formation regularities of the diffusion hardened layer are established. The modes of laser-plasma cementation and test results of the studied materials are presented. The reasons of resistance increase are revealed. The mechanical characteristics of the hardened surface layer are shown. The influence of the energy regimes of the technological process on the depth of the diffusion hardened layer is given.

Simulation of Diffusion Processes in Chemical and Thermal Processing of Machine Parts

“…Therefore, the determining factor for obtaining the necessary depth of the diffusion layer is the temperature. The diffusion layer's depth also depends on the process's duration [1,3,7,8]. As shown in previous works [7,8], the diffusion rate at the penetration of diffusing atoms into the solvent lattice will be higher if solid solutions of introduction are formed during the interaction and much lower if solid solutions of substitution are formed.…”

“…The diffusion layer's depth also depends on the process's duration [1,3,7,8]. As shown in previous works [7,8], the diffusion rate at the penetration of diffusing atoms into the solvent lattice will be higher if solid solutions of introduction are formed during the interaction and much lower if solid solutions of substitution are formed. The diffusing element concentration on the surface depends on the influx of atoms of this element to the surface and the rate of diffusion processes, i.e., removing these atoms into the metal.…”

“…Cementation is carbon saturation. As shown in [6][7][8], cementation is particularly appropriate for achieving a large depth of steel products' carburization. The disadvantage of this method is the high labor intensity and poor variability of the conditions of carburization.…”