G. N. Sokolov

Structure formation and properties of weld alloys with addition of refractory compound nanoparticles

The structure and properties of Fe and Ni3Al weld metals doped with TiCN and WC nanoparticles are investigated via optical and scanning electron microscopy, X-ray spectroscopic microanalysis, and fatigue life and abrasive wear tests.

Effect of microparticles of titanium diboride and nanoparticles of titanium carbonitride on the structure and properties of deposited metal

Formation of composite structure in a wear-resistant metal obtained by introduction of refractory microparticles of titanium diboride and nanoparticles of titanium carbonitride charged with powder wire into the molten pool is considered. Dependences of the hardness and abrasive wear resistance of the deposited metal on the content of powder titanium diboride and carbon in the charged powder wire are determined.

Test procedure of cladded alloys for resistance against high temperature abrasive wear

This article discusses the development of procedure and assembly for testing metals and alloys for abrasive wear at ambient and higher temperatures of up to 600°C. The procedure can be applied both to evaluate the operating properties of alloys used to clad of machine parts and tools of metallurgical and refractory purposes, and to test various metal and composite materials. The wear of alloys as a function of temperature, the pressure on specimen, and its shape, as well as of the composition and dispersity of abrasive mass have been determined. Hardness and wear resistance of some experimental and commercial alloys have been presented, and the influence of alloy doping and modifying on their wear resistance at higher temperatures has been established.

Wear-Resistant Coatings Reinforced with TiB2 Micro-Particles and TiCN Nano-Sized Particles

A wear-resistant composite coating process with electroslag surfacing using a current-supplying solidification mould was developed. The structure and properties of coatings from flux-cored wire deposited alloys with refractory micro-particles of titanium diboride, TiB2, and nano-sized particles of titanium carbonitride, TiCN, were studied. Special features of the elasto-plastic deformation of composite alloys’constituents were studied with sclerometry.

Phenomenological model of crystallization center nucleation in metal melt during welding under the influence of ultrafine refractory components

Metallography reveals the correlations between the amount, size, and morphology of ultrafine particles in welding materials (flux-cored and composite wires, coated electrodes, and agglomerated fluxes), as well as the processes of formation of exogenous crystallization centers in the welding pool that facilitate the structure modification and promotion of processing and working properties of deposited metal. The phenomenological model of the nucleation on ultrafine exogenous refractory chemical clusters is developed on the basis of the experimental data and on the existing view of the kinetics of fast physicochemical processes in the welding fire point.

Effect of Ultrafine Components on Welded Joint Metal Properties for Metal Structure Operation at Negative Temperatures

It is shown that introduction into electrodes and agglomerated fluxes for arc welding of ultrafine refractory compound components facilitates an increase in low-carbon steel metal structure cold resistance.

The structure and properties of the modified nitrogenated high-chromium steel for welding the parts of oil and gas equipment

The influence of nitrogen and titanium carbonitride particles on the structure and properties of high-chromium steel, deposited by flux cored wire, has been studied. It has been shown that the quality formation of the weld metal and pore absence in it are achieved with nitrogen concentration in wire filler no more than 0.32 mass%. It has been found that in adding titanium carbonitride particles from 0.2 to 0.6 mass% to wire filler the effect of weld Fe-C-Cr-Mo-Ni-N system metal modification is implemented and its operational properties increase. The developed flux cored wire has been recommended for oil and gas equipment welding.

A Production Method for Wear-Resistant Deposited Coatings Modified with TiN Particles

A method of arc surfacing with a consumable electrode and a flux-cored wire containing titanium nitride micro-and nanoparticles added to the weld pool was developed. The influence of the modifier on the structure and properties of the deposited coatings was studied.

Computer-assisted design of flux-cored wires

The algorithm and description of the AlMe-WireLaB software for the computer-assisted design of flux-cored wires are introduced. The software functionality is illustrated with the selection of the components for the flux-cored wire, ensuring the acquisition of the deposited metal of the Fe-Cr-C-Mo-Ni-Ti-B system. It is demonstrated that the developed software enables the technologically reliable flux-cored wire to be designed for surfacing, resulting in a metal of an ordered composition.

Electromechanical Hardening of Nanostructured Alloy Layers Applied in Surfacing

Electromechanical hardening of applied surface layers of thermostable and wear-resistant iron and ferronickel alloys modified by ultrafine TiCN and WC particles is considered; the ferronickel alloy contains γ′-Ni3Al phase. The dependence of the microhardness and the depth of the hardened layer on the current is established.