Microstructure Development and Properties of HSS-Based Self-Lubrication Composites

2011 ◽  
Vol 217-218 ◽  
pp. 625-630 ◽  
Author(s):  
Yan Jun Wang ◽  
Bin Wang ◽  
Li Ying Yang ◽  
Shou Ren Wang
Keyword(s):  
Wear Rate ◽  
High Speed ◽  
Volume Fraction ◽  
Tribological Behavior ◽  
High Speed Steel ◽  
Solid Lubricants ◽  
Minor Importance ◽  
Crushing Strength ◽  
Pressure Infiltration ◽  
Micropore Structure

High speed steel based ceramic preforms with three-dimensionally interpenetrated micropores were fabricated using the mixture of TiH2, CaCO3 and stearic acid as pore-forming agent. A self-made vacuum high pressure infiltration furnace was used to infiltrate the preforms with Pb-Sn based solid lubricants to create almost fully dense self-lubrication composites. The microstructure and properties of HSS-based self-lubrication composites were investigated as a function of sintered porosity. A quantitative analysis of microstructure was correlated with crushing strength，microhardness and wear rate to understand the influence of pore size, shape and distribution on mechanical and tribological behavior. Crushing strength and microhardness decreased with an increase in porosity. Meanwhile the decrease in microhardness with increasing porosity was slightly. The friction coefficient of HSS-based self-lubrication composites decreased with increasing the volume fraction of lubricant due to the self-lubrication and unique micropore structure. Within the range of lubricant volume fraction from 0% to 14%, the wear rate of the composites decreased steadily with the increase of lubricant content in the composites. Micropore structure and lubricant volume fraction play an important role in determining wear resistance of the composites whereas the measured bulk properties seem to be of minor importance.

Preparation of Controlled Microporous High Speed Steel and its Composite Self-Lubrication Materials

2011 ◽  
Vol 295-297 ◽  
pp. 16-20
Author(s):  
Yan Jun Wang ◽  
Li Ying Yang ◽  
Bin Wang ◽  
Shou Ren Wang
Keyword(s):  
High Speed ◽  
Friction And Wear ◽  
High Speed Steel ◽  
Solid Lubricants ◽  
Sintering Process ◽  
Vacuum Sintering ◽  
Pressure Infiltration ◽  
Microstructure Effects ◽  
Pin On Disk ◽  
Composite Self

High speed steel (HSS) with controlled micropores was prepared via vacuum sintering process, using the mixture of stearic acid, TiH2 and CaCO3 compound as pore-forming agent. A self-made vacuum high pressure infiltration furnace was used to infiltrate the preform with 60Pb40Sn40-15Ag-0.5RE solid lubricants to create self-lubrication composite where both solid lubricant phase and matrix phase were interpenetrating throughout the microstructure. Effects of pore-forming agent on micropore structure and porosity of the prepared microporous HSS preforms were investigated. The scanning electron microscope (SEM) observation was applied to the test samples and it revealed that the micropores of the microporous materials exhibited a uniform distribution and the apertures were of almost same size in principle. The friction and wear behaviors of the composite sliding against ZrO2 ceramic under a load of 50 N at 600 °C were investigated using a pin-on-disk wear tester and the results showed that this kind composite possessed excellent high temperature self-lubrication properties.

Mechanical Analysis of Low and High Chromium Steels Used in Hot Strip Work Rolls

2018 ◽  
Vol 279 ◽  
pp. 3-9
Author(s):  
Fethi Benkhenafou ◽  
Ines Fernández Pariente ◽  
F.Javier Belzunce ◽  
Abdelkader Ziadi ◽  
Ming Quan Shi ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
High Speed ◽  
Volume Fraction ◽  
Research Work ◽  
High Speed Steel ◽  
Nodular Cast Iron ◽  
High Chromium ◽  
Eutectic Carbides ◽  
Hot Strip ◽  
Conventional Heat Treatment

Microstructure, hardness and fracture toughness of low and high chromium high speed steel used in hot strip mills and subjected to conventional heat treatment have been examined. The influence of tempering temperatures on the mechanical properties of these products, determined using tensile and fracture toughness tests, was studied in this research work. The developed microstructures have been characterized by XRD, optical microscopy and SEM examinations. Macrohardness and microhardness of the specimens have been evaluated by Vickers indentation technique. The fracture toughness of these products was investigated using the rupture weight on 3 points bending specimens. The plane strain fracture toughness KIc and the fracture strength were measured for each alloy. The shell is high harness high speed steels, and the core is nodular cast iron. It was found that most fracture occurred in the eutectic carbides formed by the high content alloy element, such as Mo,V,Cr, but that for the alloys with a reduced volume fraction of eutectic carbides, a small amount of crack propagation occurred in the austenitic dendrites.

Specifics of Microstructure and Phase Composition of High-Speed Steel R6M5

2013 ◽  
Vol 404 ◽  
pp. 20-24 ◽  
Author(s):  
Маzhyn Skakov ◽  
Bauyrzhan Rakhadilov ◽  
Gaukhar Karipbayeva
Keyword(s):  
Phase Composition ◽  
High Speed ◽  
Volume Fraction ◽  
Electron Backscatter Diffraction ◽  
High Speed Steel ◽  
Spherical Shape ◽  
Xrd Analysis ◽  
Steel R6m5 ◽  
Solid Carbide ◽  
Backscatter Diffraction

In this paper microstructure, morphology, elemental composition, phase composition and crystal structure of the sample steel R6M5 were investigate by using the methods of scanning electron microscopy, electron backscatter diffraction (EBSD) analysis and X-ray diffraction (XRD) analysis. Determined that the microstructure of steel R6M5 after hardening and three-time tempering consists of tempered martensite and solid carbide M6C and MC-type with spherical shape and a diameter of less than 3 μm. Detected that the volume fraction of each carbide amounted to 10.4±0.6% and 2.3±0.4% - for grey and bright carbides, respectively, and that the sizes of bright carbides particles in the microstructure of steel R6M5 are 0.4-4,5 μm, and the sizes of grey carbides particles are 0.5-1.1 μm. XRD analysis showed that the main carbides in the studied steel are carbides М6С and MC, which have complicated the FCC crystal lattice and the Fd3m spatial group. Determined that carbides are uniform and monocrystalline. ESBD analysis with the support of the XRD analysis showed that carbides spherical shape М6С fit to Fe3W3C composition.

Automation of calculations of cutting modes taking into account the wear of cubic boron nitride tools when applying solid lubricants

2021 ◽  
pp. 67-70
Author(s):  
Keyword(s):  
Boron Nitride ◽  
High Speed ◽  
Solid Lubricant ◽  
Cubic Boron Nitride ◽  
High Speed Steel ◽  
Solid Lubricants ◽  
Grinding Wheel ◽  
Grinding Wheels ◽  
Ceramic Bond ◽  
Calculation System

The effect of a solid lubricant on the wear of cubic boron nitride grinding wheels on a ceramic bond of different hardness and grain size in the processing of high-speed steel is investigated. The dependences of the change in the wear of cubic boron nitride on the parameters of the processing mode are determined. An automated calculation system is proposed to control the consumption of cubic boron nitride grinding wheels in production conditions. Keywords: solid lubricant, grinding, high speed steel, cubic boron nitride grinding wheel, consumption, wear, grinding mode. [email protected]

An Investigation into the Dependency of Cutting Forces on the Volume Fraction and Fibre Orientation during Machining Composite Materials

2017 ◽  
Vol 882 ◽  
pp. 61-65
Author(s):  
Fadi Kahwash ◽  
Islam Shyha ◽  
Alireza Maheri
Keyword(s):  
Cutting Forces ◽  
High Speed ◽  
Volume Fraction ◽  
Fibre Orientation ◽  
Orthogonal Cutting ◽  
Fibre Volume Fraction ◽  
High Speed Steel ◽  
Fibre Volume ◽  
Force Model ◽  
High Dependency

This paper presents an empirical force model quantifying the effect of fibre volume fraction and fibre orientation on the cutting forces during orthogonal cutting of unidirectional composites. Glass fibre plates and high speed steel cutting tools are used to perform orthogonal cutting on shaping machine whereas cutting forces are measured using platform force dynamometer. The analysis of forces shows almost linear dependency of cutting forces on the fibre content for both cutting and thrust forces. High dependency of cutting forces is also observed on fibre orientation with high percentage contribution ratio (up to 95.31%). Lowest forces corresponded to 30o and highest to 90o fibre orientation. Multivariate regression technique is used to construct the empirical model.

Preparations and Properties of Solid Lubricants Coating on High-Speed Steel Tools

2008 ◽  
Vol 392-394 ◽  
pp. 538-542
Author(s):  
Suo Xia Hou ◽  
Xiao Ming Jia ◽  
C. Wu
Keyword(s):  
Surface Roughness ◽  
High Speed ◽  
Solid Lubricant ◽  
Testing Machine ◽  
High Speed Steel ◽  
Solid Lubricants ◽  
Solid Lubrication ◽  
Mixture Ratio ◽  
Solid Lubricant Coating ◽  
Cutting Test

This paper presents that the high-speed steel tools with solid lubrication material coating can cut without fluid because it has the quality of self-lubrication. With the help of M-2 friction and wearing testing machine and KYKY2800 scan electron microscope, the coating preparation technology and mixture ratio of solid lubrication material in complex coating can be optimized. The results show: phosphate treatment can increase the power of the tools’ surface adsorbing solid lubricant, and the frictional behaviour of solid lubrication coating is excellent when surface roughness of phosphate coating is Ra 2μm~Ra 4μm; molybdenum bisulfide, graphite and trioxid aluminium are mixed together and form a kind of complex coating which has better antifriction effect. The cutting test shows that the solid lubricant coating on the high-speed steel tools can be helpful in increasing the service life of the tools, decreasing the cutting resistance, and reducing the chip deformation and surface roughness of finished work.

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.

scholarly journals Characterization and Tribological Behavior of TiAlN/TiAlCN Multilayer Coatings

2018 ◽  
Vol 140 (5) ◽  
Author(s):  
Zhefeng Lei ◽  
Xiaodong Zhu ◽  
Yanhuai Li ◽  
Zhongxiao Song ◽  
Haiping Liu ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Flow Rate ◽  
Bonding Strength ◽  
High Speed ◽  
Tribological Behavior ◽  
Multilayer Coating ◽  
High Speed Steel ◽  
Multilayer Coatings ◽  
Low Wear ◽  
N2 Flow Rate

Effects of partial pressure of methane on deposition rate, hardness, bonding strength and friction coefficient of TiAlN/TiAlC0.37N0.63 multilayer coating were investigated. The TiAlN coating was deposited at a N2 flow rate of 70 sccm, and TiAlC0.37N0.63 coating were deposited at a N2 flow rate of 35 sccm and a CH4 flow rate of 35 sccm. TiAlN/TiAlC0.37N0.63 multilayer coatings with different modulation periods but the same total thickness of 3.56 μm were deposited on high speed steel (HSS) substrates using multi-arc ion plating technology. Microhardness and tribological measurement show that the multilayer coating with a modulating ratio of 1:1 and a modulation period of 68 nm had a hardness of 2793.9 HV0.10, an excellent bonding strength of 52 N, and the minimum friction coefficient of 0.46 and a relatively low wear rate.

scholarly journals Study on the Tribological Behavior of Wear and Friction Coefficient on AISI M35 High-Speed Steel with and without DLC Coating

2022 ◽  
Vol 25 ◽  
Author(s):  
Paulo Sérgio Martins ◽  
José Rubens Gonçalves Carneiro ◽  
Elhadji Cheikh Talibouya Ba ◽  
Vitor Ferreira Vieira ◽  
Diego Boaventura Amaral ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
High Speed ◽  
Tribological Behavior ◽  
High Speed Steel ◽  
Dlc Coating ◽  
Wear And Friction
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