The deposition of a thin (several tens microns) protective coating in atmospheric conditions is challenging task for surface engineering. structural features and tribological properties particle-reinforced metal matrix composite synthesized on middle-carbon steel by air pulse-plasma treatments were studied the present work. 24–31 µm thick “24 vol.% (TiC + WC)/Hardened matrix” was produced 10 plasma pulses generated an electro-thermal axial accelerator equipped with consumable cathode novel...

The work is dedicated to the comparative study of a Co-28Cr-6Mo alloy fabricated by two methods (forging and laser bed fusion (LPBF)), in terms micro-mechanical, corrosion, tribological properties. wrought had an ε-HCP (60.4 vol%)+ γ-FCC structure with grain size 43.9 ± 7.1 µm cast-based dendritic pattern. LPBF presented (72.8 featuring three main microstructural patterns: (1) melt pools columnar grains, (2) solidification cellular network, (3) dislocations walls strain-aged elemental...

Structural rolled steels are the primary products of modern ferrous metallurgy. Consequently, enhancing mechanical properties steel using energy-saving processing routes without furnace heating for additional heat treatment is advisable. This study compared effect on structural different routes, like conventional hot rolling, normalizing thermo-mechanically controlled (TMCP), and TMCP with accelerating cooling (AC) to 550 °C or 460 °C. The material studied was a 20 mm-thick sheet S355N grade...

Additive manufacturing is increasingly used to produce metallic biomaterials, and post-processing gaining increasing attention for improving the properties of as-built components. This study investigates effect work hardening followed by recrystallisation annealing on tensile nanoindentation behaviour laser powder bed-fused (LPBF) 316L stainless steel, with aim optimising its mechanical properties. As-built thermally stabilised (at 900 °C) specimens were prestrained in a uniaxially manner at...

The structural features and nanoindentation/tribological properties of 316 stainless steel fabricated by conventional rolling laser-based powder bed fusion (LPBF) were comparatively investigated regarding the effect surface-pulsed plasma treatment (PPT). PPT was performed using an electrothermal axial accelerator under a discharge voltage 4.5 kV pulse duration 1 ms. Optical microscopy, scanning electron X-ray diffraction, nanoindentation measurements tribological tests applied to...

У статті розглянуто створення прототипу інтелектуальної системи моніторингу та оптимізації параметрів вирощування мікроорганізмів у лабораторних умовах. Згідно останніх даних, на 2018 рік світі налічувалося 27 мільярдів пристроїв з IoT, всього за 7 років ця кількість зросла до 75 мільярдів. Дана технологія вже почала відігравати важливу роль автоматизації всіх галузей виробництва завдяки розширеним можливостям з’єднання приладів допомогою мережі інтернет. Враховуючи це, а також успішні...

Selected Laser Melting fabricated 316L steel was studied to reveal its microstructural features and the wear properties under dry sliding against counter ball made of different materials (low-alloyed 100Cr6, high-alloyed 440C, corundum). It found that SLM featured a fine-dendrite structure "fish-scale" pattern which ensured higher hardness (by 2 times) performance 21–58 %) as compared hot-rolled analogue. had same volumetric when tested 100Cr6 440C balls; Al2O3 increased by 3 times...

This paper is devoted to the evaluation of "three-body-abrasion" wear behaviour (wt.%) 5W-5Mo-5V-10Cr-2.5Ti-Fe (balance) multi-component (C + B)-added alloys in as-cast condition. The carbon (0.3 wt.%, 0.7 1.1 wt.%) and boron (1.5 2.5 3.5 contents were selected using a full factorial (32) design method. had near-eutectic (at 1.5 wt.% B) or hyper-eutectic 2.5-3.5 structure. structural micro-constituents (in different combinations): (a) (W, Mo, V)-rich borocarbide M2(B,C)5 as coarse primary...

In this paper, enhancing the tribological characteristics of novel cast metallic materials-hybrid multi-component irons-by applying a strengthening heat treatment is described. The experimental materials were alloys nominal composition (5 wt.% W, 5 Mo, V, 10 Cr, 2.5 Ti, Fe balance) supplemented with 0.3-1.1 C and 1.5-2.5 B (total nine alloys). was oil-quenching followed by 200 °C tempering. quench temperature (QT) varied in range 900-1200 °C, step 50 (with 2-h holding at QT). correlation QT...

The structural and tribological properties of a protective high-chromium coating synthesized on gray cast iron by air pulse-plasma treatments were investigated. was fabricated in an electrothermal axial plasma accelerator equipped with expandable cathode made white (2.3 wt.% C–27.4 Cr–3.1 Mn). Optical microscopy, scanning electron energy-dispersive spectroscopy, X-ray diffraction analysis, microhardness measurements, tests conducted for characterizations. It found that after ten pulses...

The paper investigates the formation of equilibrium phase state in surfacing materials 300Cr25Ni3Si3 and 500Cr40Ni40Si2BZr, obtained by electric arc that employs powder tapes PL AN-101 AN-111. This makes it possible to determine relationship between chemical composition tape structure formed coating. To examine patterns transformations during crystallization, we applied thermodynamic simulation using "Thermo-Calc Software". Phase diagrams system Fe-Cr-Ni-Si-C were constructed analyzed; was...

Abstract The article is aimed at the study of structural features and phase chemical composition in 3.6 wt.% C-15 Cr-2 Mo cast iron prepared with adding 0.50 boron. work was fulfilled using optical electron scanning microscopy, EDS, XRD, hardness measurement, thermodynamic modelling. It found that due to boron effect acquired hypereutectic structure consisting primary M 7 C 3 carbides (5.3 vol. %) eutectics based on carbide (rosette-shaped cells) (coarse-net-shaped cells or Ledeburite-shaped...

The paper analyzes the conditions for formation of a coating obtained using an electrothermal axial plasma accelerator due to transfer cathode erosion products. It is shown that by low-melting materials with high-current pulsed discharge, microdrops are formed and injected from falling into surface be treated. When colliding surface, drops acquire near-disk shape radius up 100 μm, cooling on substrate at speed 108 K/s. This leads in supersatu-rated solid solution nonequilibrium structure....

Purpose. High chromium cast irons with austenitic matrix have low machinability. The aim of work is search new energy-saving modes preliminary softening heat treatment enhancing the machinability castings by forming an optimum microstructure. Methodology. Metallographic analysis, hardness testing and are applied. Findings. It was found out that high temperature annealing continuous cooling yields to martensite-austenite in iron 270Х15Г2Н1MPhT, which abruptly affects iron. Significant...

Co-28Cr-6Mo alloy (ASTM F75) is widely used in different biomedical applications (dental devices, orthopedic implants, etc.). Casting and metal forming are the two conventional technologies for fabrication of this alloy. Recently, additive manufacturing has also been adopted. Due to peculiarities technological process, 3D-printed alloys differ from traditionally manufactured their structure properties. In present work, features selective laser melted were studied comparison with its wrought...

In the article, characterization of morphology, chemical composition, and elemental distribution in Ti-based carboboride M(C,B) (wt.%) Fe-0.72C-2.75B-5.05W-5.57Mo-10.35Cr-2.60Ti multi-component alloy is fulfilled. The study was performed using optical microscopy, SEM, TEM, energy-dispersive X-ray spectroscopy. It found that present structure form equiaxed polygonal particles a 0.5-7.3 mm mean size. are divided into “duplex” “uniform” ones. duplex consists Ti-rich (75 wt. % Ti) “core”...

Due to the operating conditions of weld and calibrating rolls used in production processes large electric-welded pipes, their material is subject stringent wear abrasion resistance requirements at high temperatures. The limited capabilities conventional Cr-Mn-Ni tool steels open die forging technologies with heat treatment do not provide required performance properties for welded rolls. Therefore, product was replaced Cr12MoV high-chromium steel. This identifying formation patterns fine...