scholarly journals Influence of ionic modification of high-speed steel surface on tribological characteristics

2019 ◽  
Vol 1313 ◽  
pp. 012040
Author(s):  
M Sh Migranov ◽  
S R Shekhtman ◽  
A M Migranov
Keyword(s):  
High Speed ◽  
Steel Surface ◽  
High Speed Steel ◽  
Tribological Characteristics

Surface Modification of High-Speed Steel by Plasma Nitriding

2014 ◽  
Vol 709 ◽  
pp. 403-409 ◽  
Author(s):  
Bauyrzhan K. Rakhadilov ◽  
Mazhyn Skakov ◽  
Erlan Batyrbekov ◽  
Michael Scheffler
Keyword(s):  
Surface Layer ◽  
Phase Composition ◽  
Diffusion Layer ◽  
High Speed ◽  
Steel Surface ◽  
Plasma Nitriding ◽  
High Speed Steel ◽  
R6m5 Steel ◽  
Modified Layer ◽  
Surface Modified

The article investigates the changing in the structure and phase composition of the R6M5 high-speed steel surface layer after electrolytic-plasma nitriding. It is found that after electrolytic-plasma nitriding on the R6M5 steel surface, modified layer is formed, which consist from a diffusion layer. It was showed phase composition of difysion layer is changing depending on the nitriding. It is found that electrolytic-plasma nitriding lead to accelerated formation of the modified layer. It is determined that after electrolytic-plasma nitriding on the high-speed steel surface, modified layer is formed, consisting only of the diffusion layer.

Wear-Resistance of Nitrided W-Mo-High Speed Steel in Abrasive Wear Conditions

2013 ◽  
Vol 594-595 ◽  
pp. 1117-1121
Author(s):  
Мazhyn Skakov ◽  
Bauyrzhan Rakhadilov ◽  
Merey Rakhadilov
Keyword(s):  
Wear Resistance ◽  
Surface Layer ◽  
Abrasive Wear ◽  
High Speed ◽  
Steel Surface ◽  
Plasma Nitriding ◽  
Cutting Tools ◽  
High Speed Steel ◽  
Abrasive Wear Resistance ◽  
R6m5 Steel

In this work the influence of electrolytic-plasma nitriding on the abrasive wear-resistance of R6M5 high-speed steel were under research. We registered that after electrolytic-plasma nitriding on R6M5 steel surface modified layer is formed with 20-40 μm thickness and with increased microhardness of 9000-12200 MPa. Testing mode for the nitrided samples high-speed steel on abrasive wear developed. It is established, that electrolyte-plasma nitriding allows to increase wear-resistance of R6M5 steel surface layer comparing to original. It was determined that abrasive wear-resistance of R6M5 steel surface layer is increased to 25% as a result of electrolytic plasma nitriding. Thus, studies have demonstrated the feasibility and applicability of electrolytic-plasma nitriding in order to improve cutting tools work resource, working under friction and wear conditions.

Friction Reducing Mechanism of High Speed Steel Surface with Ni-Based WC Stripes by Laser Cladding

2018 ◽  
Vol 55 (2) ◽  
pp. 021403
Author(s):  
王燕琳 Wang Yanlin ◽  
何源 He Yuan ◽  
洪鑫 Hong Xing ◽  
陈斌 Chen Bin ◽  
于爱兵 Yu Aibing
Keyword(s):  
Laser Cladding ◽  
High Speed ◽  
Steel Surface ◽  
High Speed Steel ◽  
Friction Reducing

A Micro-Deposition Method by Using EDM

2007 ◽  
Vol 339 ◽  
pp. 32-36 ◽  
Author(s):  
Bai Dong Jin ◽  
Guo Hui Cao ◽  
Zhen Long Wang ◽  
Wan Sheng Zhao
Keyword(s):  
Electrode Material ◽  
High Speed ◽  
Steel Surface ◽  
High Speed Steel ◽  
Processing Parameters ◽  
Tool Electrode ◽  
Micro Edm ◽  
Deposition Method ◽  
Basic Principles ◽  
And Tungsten

A new micro EDM method is described. First, the basic principles of micro EDD are analyzed and realized conditions are predicted. Then with an ordinary EDM shaping machine and electrode brass, steel and tungsten, a large number of experiments are carried out in air to obtain the effects of different processing parameters on micro EDD. A micro cylinder with 0.19mm in diameter and 7.35mm in height is formed on high-speed steel surface. By exchanging the polarities of electrode and workpiece the deposited material can be removed selectively, thus the reversible machining is realized. In the end, measurements show that the deposited material is compact and hardened, whose components depend on the tool electrode material although Zn in brass electrode is oxidized to ZnO.

Magnetic Field on Properties of Solid Lubricants Coating on High-Speed Steel Surface

2010 ◽  
Vol 148-149 ◽  
pp. 728-731
Author(s):  
Suo Xia Hou ◽  
Xiao Ming Jia ◽  
Chao Wu
Keyword(s):  
Magnetic Field ◽  
High Speed ◽  
Steel Surface ◽  
Solid Lubricant ◽  
Processing System ◽  
High Speed Steel ◽  
Solid Lubricants ◽  
Phosphate Solution ◽  
Solid Lubricant Coating ◽  
Lubricant Coating

The main factors that affect properties of solid lubricant coating on high-speed steel surface are the surface roughness and the weight of phosphate coating. The effect of magnetic field on high speed steel phosphate process is significant. It promotes the film and the different appearance and composition of the film. Because the ferric phosphate and dihydric phosphate in phosphate solution may be ordered arrangement by additional magnetic field, they can be deposited on metal surfaces quickly. That is to say that a certain intensity of the magnetic field can reduce the entropy of the phosphate processing system and speed up the formation of phosphate film. During phosphate treatment, the friction performance of high-speed steel coated with solid lubricant coating was significantly improved.

Study of High Co Superhard High Speed Steel Surface

2009 ◽  
Vol 610-613 ◽  
pp. 253-256
Author(s):  
Zhong Hou Li ◽  
Sha Sha Liu ◽  
Zhi Yong Cheng
Keyword(s):  
Surface Layer ◽  
High Speed ◽  
Steel Surface ◽  
High Surface ◽  
Surface Hardness ◽  
High Speed Steel ◽  
Low Alloy Steel ◽  
Surface Alloying ◽  
Plasma Surface ◽  
Plasma Surface Alloying

Cobalt- superhard high speed steel layer has been formed on the surface of low alloy steel 20Cr2V by tungsten-molybdenum-cobalt plasma surface alloying and following plasma carbonizing. After plasma surface alloying, a homogeneous and dense surface alloying layer was formed, thickness of which is 200μm. Composition, microstructure and properties of the alloying layer were investigated. Contents of W, Mo, Co, Cr, V and C in the surface layer reach 8%,5%, 6% ,4%,1.5% and 1.5% or so respectively. The concentrations of alloy elements basically meet the requirements of high cobalt type superhard high speed steel. Constituent phases of the surface layer were martensite, M7C3 ,M2C and Cr3C2 carbides and μ phase after quenching treatment. The advanced gradient superhard high speed steel possesses not only high surface hardness, high anti-temper softening ability but also enough toughness.

Change of Structure and Mechanical Properties of R6M5 Steel Surface Layer at Electrolytic-Plasma Nitriding

2014 ◽  
Vol 1040 ◽  
pp. 753-758 ◽  
Author(s):  
Mazhyn Skakov ◽  
Bauyrzhan Rakhadilov ◽  
Erlan Batyrbekov ◽  
Michael Scheffler
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
High Speed ◽  
Steel Surface ◽  
Plasma Nitriding ◽  
Cutting Tools ◽  
High Speed Steel ◽  
High Hardness ◽  
R6m5 Steel ◽  
Temperature Plasma

In the article changes in the structure and mechanical properties of R6M5 steel surface layer after electrolytic-plasma nitriding are shown. The optimal mode of electrolytic-plasma nitriding of R6M5 high-speed steel in electrolyte based on carbamide, which allows saturation of the surface with nitrogen from low-temperature plasma and get the modified layer of high hardness and wear-resistance. It is established, that after electrolytic-plasma nitriding reduced R6M5 steel wear rate and increases its resistance to abrasive wear. Perspectivity of use an electrolytic-plasma nitriding method to improve performance cutting tools made from R6M5 steel is shown.

Thermal Treatment of the AISI M2 High Speed Steel Promoted by a CO2 Laser Beam

2008 ◽  
Vol 591-593 ◽  
pp. 62-67 ◽  
Author(s):  
G. de Vasconcelos ◽  
J.L. dos Reis ◽  
M.V. Campanha ◽  
A.F. da Silva
Keyword(s):  
Raman Spectroscopy ◽  
Thermal Treatment ◽  
Laser Beam ◽  
High Speed ◽  
Steel Surface ◽  
Iron Carbide ◽  
High Speed Steel ◽  
Incident Radiation ◽  
Surface Sample ◽  
Graphite Coating

The purpose of this paper is the evaluation of the use of a low power CO2 laser beam (50W) to promote the thermal treatment of AISI M2 high-speed steels and evaluate the tribological properties of the graphite coating that takes place on the steel surface after laser irradiation. In order to minimize the steel surface reflection at approximately 90% of the incident radiation wavelength (10.5 μm), an incident radiation absorber layer was applied to the steel surface sample. This coating aims to absorber the incident heat and transfer part of heat to the steel surface. As results the surface presented high hardness and a thin coating of graphite on the surface. The micro-structural changes, occurred on the steels surface, resulting from heat transfer from the absorbing layer, were evaluated through optical microscopy (MO), scanning electron microscopy (MEV), micro-hardness essays (MH), X-ray analysis (XRD), Raman spectroscopy and tribological testers on the graphite coating. MO analysis showed on the transversal section of the heated affected zone a brighter layer than the sample’s core, 30 micrometers thickness, in the surface sample a black coat 10 micrometers thickness. By MH analysis this brighter layer presented hardness approximately 30% superior than the regions without treatment, and by Raman spectroscopy it was evaluated the graphite coating. The XRD analysis on the surface sample reveals an increasing of the martensite and iron-carbide phase. The experimental results of pin-on-disk tests on the graphite coatings reveal a reduced coefficient friction as compared to the original surface.

Effect of Laser Surface Melting on Structure and Properties of a High Speed Tool Steel

2011 ◽  
Vol 291-294 ◽  
pp. 1365-1368 ◽  
Author(s):  
Mirosław Bonek ◽  
Grzegorz Matula ◽  
Leszek Adam Dobrzański
Keyword(s):  
Surface Layer ◽  
High Speed ◽  
Steel Surface ◽  
Structure Refinement ◽  
High Speed Steel ◽  
Laser Surface ◽  
Structure And Properties ◽  
Surface Layers ◽  
Metal Base ◽  
Protection Method

The purpose of this research paper is focused on the high speed steel surface layers improvement properties using HPDL laser. The paper present laser surface technologies, investigation of structure and properties of the high speed steel alloying with carbides using high power diode laser HPDL. Investigation indicate the influence of the alloying carbides on the structure and properties of the surface layer of investigated steel depending on the kind of alloying carbides and power implemented laser (HPDL). In the effect of laser alloying with powder of carbides occurs size reduction of microstructure as well as dispersion hardening through fused in but partially dissolved carbides and consolidation through enrichment of surface layer in alloying additions coming from dissolving carbides. Introduced particles of carbides and in part remain undissolved, creating conglomerates being a result of fusion of undissolved powder grains into molten metal base. The structural mechanism was determined of surface layers development, effect was studied of alloying parameters, gas protection method, and thickness of paste layer applied onto the steel surface on structure refinement and influence of these factors on the mechanical properties of surface layer, and especially on its hardness, abrasive wear resistance, and roughness. It has the important cognitive significance and gives grounds to the practical employment of these technologies for forming the surfaces of new tools and regeneration of the used ones.

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