Obtaining Hardened Layers of Heat-Resistant Steels by Plasma-Welding Deposition of Congeneric Materials

Abstract

The paper presents the research results on plasma-hardening of heat-resistant steel layers by plasma-welding deposition of congeneric materials under straight and reverse polarity current. The dependence of the deposited layer quality on the current polarity has been determined. A metallographic examination and measurement of micro-hardness of the deposited layer have been conducted. The dependence of the deposited layer characteristics on the welding parameters has been determined. The obtained results allow the use of plasma-welding deposition to obtain layers with the required strength characteristics using the material, congeneric to the parent material.

The Impact of Pulse Plasma Treatment on the Operating Characteristics of Steel 40X10C2M: Experiment and Numerical Simulations

“…In various works researchers observed an increase in the microhardness of the modified layer and an ambiguous change of the microhardness along the depth of the layer. For instance, in work [7] the microhardness maxima on the surface of the modified metal layer and a decrease of microhardness deep into this layer up to values typical for the base were obtained. The electro-explosive boron-copper plating of the steel-45 surface resulted in a threefold increase of the surface microhardness [8].…”

“…Here it is necessary to highlight the pulse-plasma technology (PPT) [2,7] for material processing, the advantages of which are high heating and cooling rates of the metal surface (106-108 K/s), the ability of varying the plasma stream parameters (number of pulses, specific power) and the ability of creating layered structures with various phase composition. Another advantage is the ability to impact the item locally by pulsed plasma.…”