scholarly journals INVESTIGATION OF THE PROPERTIES OF NON-TUNGSTEN ELECTRO-SPARK COATINGS ON HIGH SPEED STEEL

2017 ◽  
Author(s):  
T. Penyashki ◽  
G. Kostadinov ◽  
M. Kandeva
Keyword(s):  
High Speed ◽  
Electrode Materials ◽  
High Speed Steel ◽  
Quality Characteristics ◽  
Hard Alloys ◽  
Technological Parameters ◽  
Wear Resistant Coatings ◽  
Composition And Structure ◽  
Electric Parameters ◽  
The Impact

In this work contactless local electro spark deposition (LESD), has been used to received wear resistant coatings from hard alloys based of ТiC, TiN, TiCN onto high speed steel HS6–5–2. The influence of the operating electric parameters and the electrode materials on the roughness, thickness, microhardness, phase composition, and on the structure of resulting coatings was studied. The impact of different electrode materials on the quality characteristics, the composition and structure of the resulting coatings has been found. The technological parameters of the LESD process for the formation of coatings with a predefined roughness, thickness, composition and structure has been determined.

scholarly journals MICROANALYSIS OF ELECTROSPARK COATINGS BASED ON ELECTROEROSION POWDERS

2017 ◽  
Vol 21 (3) ◽  
pp. 34-40
Author(s):  
E. V. Ageeva ◽  
A. Yu. Altukhov ◽  
E. P. Novikov
Keyword(s):  
Hard Alloy ◽  
High Speed ◽  
Electrode Materials ◽  
High Speed Steel ◽  
Steel Powder ◽  
Optical Microscope ◽  
Hard Alloys ◽  
Functional Coatings ◽  
Electrospark Coating ◽  
Electroerosion Dispersion

The development of modern engineering requires improvement of quality, reliability and durability of parts, assemblies and mechanisms. One of the efficient ways to solve these problems is to applyf functional coatings obtained by the method of electric-spark alloying (ESA). Main electrode materials are mostly sintered hard alloys, which cost due to expensive tungsten in them is relatively high. To solve this problem, a VK8 (90%) hard alloy powder (as a main part) and 10% of high speed steel powder, Gr. R6M5 are proposed to be used as an electrode material. One of the promising methods to produce powders from almost any conductive material, including hard alloy and high speed steel wastes, is the method of electroerosion dispersion (EED), characterized by relatively low energy costs and an environmentally friendly process. The aim of this work is to perform a microanalysis of a steel 30KHGSA section substrate and electrospark coating obtained by electrospark alloying by UR-121 using electrodes of a mixture of electroerosion powders VK8 (90%)+R6M5 (10%), obtained by electroerosion dispersion of hard alloy and high speed steel wastes in illuminating kerosene. To obtain a micro and nano powder of hard alloy and high speed steel wastes a unit for electric erosion dispersing of conductive materials was used. Microanalysis was performed by means of an inverted optical microscope OLYMPUS GX51. The microanalysis allowed us to determine the shape and size of individual grains and their relative positions to identify the presence of inclusions and microdefects and to judge on the properties of the substrate (30KHGSA) and the coating (VK8+R6M5).

scholarly journals X-RAY MICROANALYSIS OF ELECTRIC-SPARK COATINGS BASED ON TUNGSTEN-CONTAINING ELECTROEROSION POWDERS

2018 ◽  
Vol 22 (3) ◽  
pp. 29-39
Author(s):  
A. Yu. Altukhov ◽  
E. V. Ageeva ◽  
A. A. Gorokhov ◽  
A. S. Osminina
Keyword(s):  
High Speed ◽  
Electrode Materials ◽  
Experimental Studies ◽  
High Speed Steel ◽  
Hard Alloys ◽  
Solid Alloy ◽  
Electrospark Alloying ◽  
Electrospark Coating ◽  
X Ray ◽  
Electroerosion Dispersion

The development of modern engineering requires improving the quality, reliability and durability of parts, components and mechanisms. One of the effective ways to solve these problems is the use of various functional coatings, including the method of electrospark alloying (EIL). The main electrode materials are mainly sintered hard alloys, the cost of which, due to the presence of expensive tungsten, is relatively high. One of the promising methods for producing powder from almost any conductive material, including solid alloy and high-speed steel waste, is the method of electroerosion dispersion (EED), characterized by relatively low energy costs and environmental cleanliness of the process. The purpose of this work was to conduct x-ray Microspectral microanalysis of the electrospark coating obtained by electrospark alloying on the UR-121 installation with the use of electrodes from a mixture of electroerosion powders of the VK8 (90%)+P6M5 (10%) brand obtained by electroerosion dispersion of solid alloy and high-speed steel waste in kerosene lighting. The electrode was obtained by mixing the powders in the ratio VK-8 (90%) + R6M5(10%), Electrospark coatings formed by the electrode on a sample of steel 30HGSA received at the installation UR-121 (production of the company PELM, Podolsk). In order to identify the distribution of elements on the surface of the electrospark coatings, with the help of energy-dispersion analyzer of x-ray radiation of the company EDAX, built into the raster electron microscope "QUANTA 200 3D", the spectra of the characteristic x-ray radiation at various points on the surface of the sample were obtained. On the basis of experimental studies aimed at conducting x-ray Microspectral microanalysis of the electrospark coating obtained by electrospark alloying on the installation UR-121 with the use of electrodes from a mixture of electroerosion powders of the brand VK8 (90%)+P6M5 (10%) obtained by electroerosion dispersion of solid alloy waste and high-speed steel in kerosene lighting, the content of the main elements in it is determined.

Effect of Spark Plasma Sintering on the Microstructure Evolution and Properties of M3:2 High-Speed Steel

2014 ◽  
Vol 788 ◽  
pp. 329-333
Author(s):  
Rui Zhou ◽  
Xiao Gang Diao ◽  
Jun Chen ◽  
Xiao Nan Du ◽  
Guo Ding Yuan ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Spark Plasma Sintering ◽  
High Speed ◽  
Bending Strength ◽  
Sintering Temperature ◽  
High Speed Steel ◽  
Continuous Heating ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
The Impact

Effects of sintering temperatures on the microstructure and mechanical performance of SPS M3:2 high speed steel prepared by spark plasma sintering was studied. High speed steel sintering curve of continuous heating from ambient temperature to 1200°C was estimated to analyze the sintering processes and sintering temperature range. The sintering temperature within this range was divided into groups to investigate hardness, relative density and microstructure of M3:2 high-speed steel. Strip and quadrate carbides were observed inside the equiaxed grains. SPS sintering temperature at 900°C can lead to nearly full densification with grain size smaller than 20μm. The hardness and bending strength are higher than that of the conventionally powder metallurgy fabricated ones sintered at 1270°C. However, fracture toughness of the high speed steel is lower than that of the conventional powder metallurgy steels. This can be attributed to the shape and distribution of M6C carbides which reduce the impact toughness of high speed steels.

scholarly journals Thermographic Study of Chip Temperature in High-Speed Dry Milling Magnesium Alloys

2016 ◽  
Vol 7 (2) ◽  
pp. 86-92 ◽  
Author(s):  
Józef Kuczmaszewski ◽  
Ireneusz Zagórski ◽  
Piotr Zgórniak
Keyword(s):  
Temperature Measurement ◽  
Magnesium Alloys ◽  
High Speed ◽  
Machining Process ◽  
Dry Milling ◽  
Technological Parameters ◽  
Chip Temperature ◽  
Thermographic Study ◽  
On Chip ◽  
The Impact

Abstract This paper presents an overview of the state of knowledge on temperature measurement in the cutting area during magnesium alloy milling. Additionally, results of own research on chip temperature measurement during dry milling of magnesium alloys are included. Tested magnesium alloys are frequently used for manufacturing elements applied in the aerospace industry. The impact of technological parameters on the maximum chip temperature during milling is also analysed. This study is relevant due to the risk of chip ignition during the machining process.

Tribological Characteristic of Tool Steel Surface Layer Alloyed Using Laser

2020 ◽  
Vol 308 ◽  
pp. 110-118
Author(s):  
Mirosław Bonek ◽  
Eva Tillová
Keyword(s):  
Surface Layer ◽  
High Speed ◽  
Structural Changes ◽  
Dendritic Structure ◽  
High Speed Steel ◽  
Beam Power ◽  
Ceramic Phase ◽  
Structural Mechanism ◽  
Conventional Heat Treatment ◽  
The Impact

The article presents the results of research on the impact of laser surface treatment on selected steel properties. The laser treatment consisted of remelting and alloying high speed steel using hard ceramic phase powders. A high-power diode laser was used in the experiment to examine the effect of parameters such as beam power and powder type on the structure and properties of the surface layer. A structural mechanism was observed consisting in obtaining, after laser processing, a super fine crystalline structure and a dendritic structure at the remelting zone. Structural changes have been found to be associated with improved properties such as hardness, microhardness and wear resistance. Steel treated with conventional heat treatment was used as a comparative material.

Phase composition and structure of atomized powders of a high-vanadium tungsten-molybdenum high-speed steel

1976 ◽  
Vol 15 (12) ◽  
pp. 903-905
Author(s):  
A. N. Popandopulo ◽  
L. N. Gerashchenko ◽  
Z. S. Bystrova ◽  
G. P. Anastasiadi
Keyword(s):  
Phase Composition ◽  
High Speed ◽  
High Speed Steel ◽  
Composition And Structure

Research on Vibration Tapping of Hardened Steel

2006 ◽  
Vol 315-316 ◽  
pp. 51-55
Author(s):  
R.D. Han ◽  
B.L. Yin
Keyword(s):  
High Speed ◽  
Torsional Rigidity ◽  
Influencing Factor ◽  
High Speed Steel ◽  
Hardened Steel ◽  
Small Hole ◽  
Theoretic Analysis ◽  
Practical Solution ◽  
Micro Cracks ◽  
The Impact

As high-speed steel tap is incapable of small-hole tapping (M3) in hardened steel, vibration tapping is introduced in this paper to solve this problem. Theoretic analysis with fracture mechanics indicates that the impact effect of the tap on the workpiece results in extended micro cracks and a much lower tapping torque. And the torsional rigidity of the tap is enforced in vibration tapping as proved by dynamic analysis. The experimental results show that with well chosen amplitudes, tapping torque decreases as vibration frequency increases and increases with the increase of net cutting time ratio, with the latter being the more significant influencing factor. In vibration tapping of hardened steel, 24 threads can be machined with a single tap. Vibration tapping is then proved to be a practical solution to the problem of small-hole tapping in hardened steel.

Study of Fracture Resistance of Nanolaminate Coatings Using Indentation and Impact Tests

2016 ◽  
Vol 258 ◽  
pp. 318-321 ◽  
Author(s):  
Vilma Buršíková ◽  
Jaroslav Sobota ◽  
Jan Grossman ◽  
Tomáš Fořt ◽  
Libor Dupák ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnetron Sputtering ◽  
Fracture Resistance ◽  
High Speed ◽  
High Speed Steel ◽  
Dynamic Impact ◽  
Impact Tests ◽  
Load Limit ◽  
Steel Substrates ◽  
The Impact

The aim of the present work was to study the mechanical properties of thin nanocomposite Mo-B-C coatings consisting of nanocrystalline Mo2BC embedded in amorphous Mo-B-C matrix. Magnetron sputtering of three targets, B4C, C and Mo, was used for coatings preparation. The Mo-B-C coatings were deposited on high speed steel substrates. The fracture resistance of Mo-B-C coatings was studied by both indentation and dynamic impact tests. The impact tests enabled us to predict the load limit causing the coating destruction.

Microstructure and Mechanical Properties of Spray Deposited W9Mo3Cr4V High Speed Steel

2011 ◽  
Vol 391-392 ◽  
pp. 714-718
Author(s):  
Rui Zhou ◽  
Jian Fei Sun ◽  
Ying Jun Yang
Keyword(s):  
Mechanical Properties ◽  
Impact Toughness ◽  
High Speed ◽  
Bending Strength ◽  
Spray Deposition ◽  
High Speed Steel ◽  
Solidification Shrinkage ◽  
Microstructure And Mechanical Properties ◽  
The Matrix ◽  
The Impact

Microstructure and mechanical properties of W9Mo3Cr4V high speed steel fabricated by spray deposition have been studied. Spray deposited W9Mo3Cr4V high speed steel has a typical equiaxed structure which is finer and more homogeneous with a grain size of 20-30 micrometer compared with conventional casted counterparts. There are pores in the matrix of the deposited steel, which involve gas porosity, filling porosity and solidification shrinkage. As-deposited high speed steel is mainly composed of martensite, austenite and carbides which comprise MC carbide and M6C carbide. Mechanical properties show that the hardness and bending strength of the as-deposited steel are higher than that of the conventionally casted ones. However, impact toughness of the high speed steel is lower than that of the conventionally casted steel, which can be attributed to the existence of porosities and M6C carbides which reduce the impact toughness of high speed steels.

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