Influence of Electrolyte Plasma Treatment on Structure, Phase Composition and Microhardness of Steel Р6М5

Abstract

Microhardness of nitrated and carbonitriding in electrolyte plasma steel Р6М5 surface layers are investigated in the research. It shows perspectiveness of the cutting tool electrolyte-plasma treatment technology. Operating conditions for the technology realization are defined. It was also indicated the desired content of components in saturating mixtures by nitriding and carbonitriding. Comparative research of structure, phase composition of fast-cutting P6M5 steel modified surface layers after electrolyte plasma treatment was carried out by scanning-electron and light microscopy, and X-ray structure analysis methods. The way of electrolytic plasma nitriding in cathodic mode, to provide fast-cutting steels which allows for modification the surface and high kinetic efficiency the process diffusion saturation. It was established that as a result of nitriding and nitrocarburizing in plasma electrolyte has been a significant increase in microhardness in the surface layers of steel Р6M5.

INFLUENCE OF PLASMA ELECTROLYTIC HARDENING ON THE STRUCTURE AND PROPERTIES OF 20Cr2Ni4A STEEL

“…Table 1 presents the chemical composition of the investigated steel. PEH of steel samples was performed on the unit IEPPM-M (installation for electrolytic-plasma processing of materials -modernized), which was designed and manufactured by the authors at the Research Center "Surface Engineering and Tribology" of S. Amanzholova EKSU [9][10][11]. The PEH process was carried out in an electrolyte from an aqueous solution containing 20 % sodium carbonate and 20% urea in the following mode: the applied voltage between the anode and the sample -320 V, the current density -25 A/cm 2 , and the plasma exposure time -2 s. In this mode, the samples were heated to ~ 850-900 °C.…”

“…It is possible to produce hardening, chemicalthermal and thermal-cyclic processing of materials which depending on the heating mode, electrolyte composition, design parameters of the equipment. The last decade is actively studying the effect of electrolyteplasma nitriding, cementation and carbonitriding on the structure and properties of steels [7][8][9][10][11]. Nevertheless, many physical processes are still not well understood, for example, phase transformation processes during electrolytic-plzmennoy surface hardening and their influence on tribomechanical properties.…”

Effects of TiN/CrN, CrAlN, and TiN Coatings on the Performance of AISI M2 Tool Steel

“…If the punch surface contacting the formed part wears and the amount of wear rises, the hole diameter of the part may alter and become dimensionally unstable, as well as the surface of the hole being of poor quality, which may result in higher manufacturing costs. Surface quality (performance) of forming tools, such as enhanced wear resistance, can be improved by utilizing various surface treatments [7][8][9][10][11]: plasma vapour deposition (PVD), chemical vapour deposition (CVD), plasma immersion ion implantation, and plasma electrolyte nitriding.…”

The influence of pulse-plasma treatment on the phase composition and hardness of Fe-TiB2-CrB2 coatings

“…However, the coatings obtained by these methods have a number of drawbacks: low hardness and wear resistance of the coating surface, the presence of pores in the coating [3,8], which cannot meet the demand for a long service life of the workpiece. Various methods of surface modification, such as plasma treatment, ion, electron and laser irradiation, etc., can be applied to improve these coating properties [9,10]. Among such coating modification methods, pulsed plasma treatment (PPT) is of particular interest [11].…”