scholarly journals Tribological Studies on AISI 1040 with Raw and Modified Versions of Pongam and Jatropha Vegetable Oils as Lubricants

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Y. M. Shashidhara ◽  
S. R. Jayaram
Keyword(s):  
Vegetable Oils ◽  
Friction And Wear ◽  
Mineral Oil ◽  
Significant Drop ◽  
Lubrication Regimes ◽  
Pin On Disc ◽  
Stribeck Curves ◽  
Sliding Distance ◽  
Friction And Wear Tests ◽  
Film Lubrication

The friction and wear tests on AISI 1040 are carried out under raw, modified versions of two nonedible vegetable oils Pongam (Pongamia pinnata) and Jatropha (Jatropha curcas) and also commercially available mineral oil using a pin-on-disc tribometer for various sliding distances and loads. A significant drop in friction and wear for AISI 1040 is observed under Pongam and Jatropha raw oil compared to mineral oil, for the complete tested sliding distance and load, increasing the potential of vegetable oil for tribological applications. Stribeck curves are also drawn to understand the regimes of lubrication. Both the vegetable oils showed a clear reduction in the boundary lubrication regimes, leading to an early start of full film lubrication.

Tribological improvement of hardened and tempered AISI 4140 steel against Al2O3 by using bio-lubricant

MRS Advances ◽  
2017 ◽  
Vol 2 (62) ◽  
pp. 3873-3881 ◽  
Author(s):  
M.T. Hernández-Sierra ◽  
R. Ortega-Álvarez ◽  
M.G. Bravo-Sánchez ◽  
L.D. Aguilera-Camacho ◽  
J.S. García-Miranda ◽  
...  
Keyword(s):  
Castor Oil ◽  
Friction And Wear ◽  
Room Temperature ◽  
Wear Track ◽  
Mineral Oil ◽  
Wear Performance ◽  
Aisi 4140 Steel ◽  
Aisi 4140 ◽  
Pin On Disc ◽  
Sliding Distance

ABSTRACTAISI 4140 steel is a popular low alloy steel due to its wide applications as workpiece in the metal-mechanic industry; there are extensive research about surface modification to enhance its properties for specific applications. The focus of this study was to investigate the influence of the nature of lubricants, mineral and vegetable oils, on the tribological performance of the hardened and tempered AISI 4140 steel against alumina (Al2O3). For this purpose, friction tests were conducted in a pin on disc tribometer according to ASTM standard G 99-05, at room temperature of 25 °C and in air with about 30% relative humidity. Lubricants were selected to be commercial Holifa B22/2 oil as mineral oil and Castor Oil as bio-lubricant, with kinematic viscosity at 25 °C of 667 and 662 cSt respectively. The following conditions were settled for all the experiments: relative sliding speed of 0.05 ms-1, sliding distance of 1000 m and wear track radius of 2 mm. Friction behaviour was reported as the average kinetic friction coefficient (µK) while wear performance was evaluated as wear rate (K). In order to identify and determine wear mechanisms, worn surfaces were analyzed by optical microscopy and profilometry. It was found that, for these tribosystems, hardened and tempered AISI 4140 steel had the best friction and wear performance under lubrication with Castor Oil. The lowest µK achieved was 0.035, whereas the lowest K was 1.02x10-8 mm3/Nm. With this bio-lubricant, there were reductions in friction and wear up to 72% compared with those under mineral oil lubrication.

Effect of Arc Discharge on Friction and Wear Behaviors of Stainless Steel/Copper-Impregnated Metalized Carbon Couple under Electric Current

2010 ◽  
Vol 150-151 ◽  
pp. 1364-1368 ◽  
Author(s):  
Tao Ding ◽  
Guang Xiong Chen ◽  
Ming Xue Shen ◽  
Min Hao Zhu ◽  
Wei Hua Zhang
Keyword(s):  
Stainless Steel ◽  
Electric Current ◽  
Friction And Wear ◽  
Arc Discharge ◽  
Arc Erosion ◽  
Pin On Disc ◽  
Contact Couple ◽  
Worn Surface ◽  
Oxidation Wear ◽  
Friction And Wear Tests

Friction and wear tests of stainless steel rubbing against copper-impregnated metalized carbon with electric current were carried on the pin-on-disc tester. The result indicates that arc discharge occurs in the process of experiments, and the intensity of arc discharge of interface increases with increasing of electric current and sliding velocity. As increasing of the arc discharge intensity, friction coefficient shows a tendency of slightly increase. While the rate of copper-impregnated metalized carbon material increase significantly with the increase of arc discharge intensity. Through observing the worn surface morphology of pin samples, it is found that the abrasive wear is dominant at small arc discharge due to worn particles and arc ablation craters, but arc erosion and oxidation wear are the main wear mechanisms in condition of large arc discharge due to arc discharge and its producing high temperature. The materials transfer of contact couple occurs in the process of friction and wear.

scholarly journals Tribological behaviour of microalloyed and conventional C–Mn rail steels in a pure sliding condition

2018 ◽  
Vol 232 (9) ◽  
pp. 2201-2214 ◽  
Author(s):  
JL Viesca ◽  
S González-Cachón ◽  
A García ◽  
R González ◽  
A Hernández Battez
Keyword(s):  
Friction And Wear ◽  
Microalloyed Steel ◽  
Rail Steel ◽  
Tribological Behaviour ◽  
Climate Chamber ◽  
Electron Microscopies ◽  
Test Conditions ◽  
Pin On Disc ◽  
Wear Tests ◽  
Friction And Wear Tests

This paper compares the tribological behaviour of microalloyed rail steel with conventional C–Mn rail steel under different test conditions (load, temperature and humidity). Pin-on-disc tribological tests were performed inside a climate chamber under different loads (20, 30 and 40 N), relative humidity (15, 55 and 70%) and temperatures (20 and 40 ℃). After the friction and wear tests, the worn surfaces were analysed using both confocal and scanning electron microscopies. The results obtained show that the use of microalloyed steel in railway applications under severe conditions (high loads and humidity) could lead to increased service life of the rails and could extend the time between maintenance operations.

EXPERIMENTAL INVESTIGATION TO ENHANCE THE TRIBOLOGICAL CHARACTERISTICS OF A LUBRICANT USING NANOPARTICLE ADDITIVE

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Santhosh V ◽  
Babu N
Keyword(s):  
Experimental Investigation ◽  
Friction And Wear ◽  
Piston Ring ◽  
Cylinder Liner ◽  
Cuo Nanoparticles ◽  
Effective Combination ◽  
Performance And Emissions ◽  
Pin On Disc ◽  
Wear Tests ◽  
Friction And Wear Tests

Copper oxide (CuO) nanoparticles were found to be an excellent additive to the lubricant in order to reduce the friction and wear between piston ring and cylinder liner. Friction and wear tests have been done experimentally using a pin on disc machine. Input parameters like load, speed, distance travelled are varied for each test, so that an effective combination for the minimal friction and wear have been obtained. The effect of adding additive is also found by varying the percentage of the nanoparticle in the lubricant. Also, after the best ratio for the additive in lubricant is selected, it can be used to run the engine in the laboratory, so that the performance and emissions of the engine with the new lubricant can be obtained. Finally, comparison can be made with the engine using existing lubricant.

Tribological Properties of Cast Al6061-Si3N4 Composite

2009 ◽  
Author(s):  
C. S. Ramesh ◽  
R. Keshavamurthy ◽  
B. H. Channabasappa
Keyword(s):  
Wear Rate ◽  
Molten Metal ◽  
Coefficient Of Friction ◽  
Friction And Wear ◽  
Matrix Alloy ◽  
Test Conditions ◽  
Pin On Disc ◽  
Type Machine ◽  
Wear Tests ◽  
Friction And Wear Tests

Si3N4 reinforced Al6061 composite is fabricated by liquid metallurgy technique. Si3N4 particles are nickel coated prior to addition to molten metal to improve its wettability and to ensure excellent bond between matrix and the reinforcement. Metallographic studies, friction and wear tests were carried out using pin on disc type machine. Coefficient of friction and wear rate were measured at loads varying from 20–100N and sliding velocities from 0.314–1.574m/s. It is observed that Al6061-4wt%Si3N4 composites exhibited lower wear rate and lower coefficient of friction when compared with matrix alloy under all the test conditions studied.

Experimental and Numerical Investigations of the Stribeck Curves for Lubricated Counterformal Contacts

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Tao He ◽  
Dong Zhu ◽  
Jiaxu Wang ◽  
Q. Jane Wang
Keyword(s):  
Shear Stress ◽  
Elastohydrodynamic Lubrication ◽  
Stribeck Curve ◽  
Boundary Lubrication Friction ◽  
Lubrication Regimes ◽  
Limiting Shear Stress ◽  
Wide Range ◽  
Basic Characteristics ◽  
Stribeck Curves ◽  
Film Lubrication

The Stribeck curve is an important means to demonstrate the frictional behavior of a lubricated interface during the entire transition from boundary and mixed to full-film lubrication. In the present study, a new test apparatus has been built that can operate under rolling–sliding conditions at a continuously variable speed in an extremely wide range, approximately from 0.00006 to 60 m/s, covering six orders of magnitude. Hence, a complete Stribeck curve can be measured to reveal its basic characteristics for lubricated counterformal contacts. The measured curves are compared with numerical simulation results obtained from an available unified mixed elastohydrodynamic lubrication (EHL) model that is also capable of handling cases during the entire transition. A modified empirical model for the limiting shear stress of lubricant is obtained, and a good agreement between the measured and calculated Stribeck curves is achieved for the tested base oils in all the three lubrication regimes, which thus well validates the simulation methods employed. Both the experimental and numerical results indicate that the Stribeck curves for counterformal contact interfaces behave differently from those for conformal contacts. When the rolling speed increases at a fixed slide-to-roll ratio, the friction continuously decreases even in the full-film lubrication regime due to the reduction of the lubricant limiting shear stress caused mainly by the rise of the surface flash temperature. In addition, the test results indicate that the boundary additives in a commodity lubricant may have considerable influence on the boundary lubrication friction but that on the friction in the mixed and full-film lubrication appears to be limited.

Friction and Wear Behaviors of Copper Rubbing against Carbon Material with and without Windy Conditions

2012 ◽  
Vol 602-604 ◽  
pp. 2210-2213
Author(s):  
Tao Ding ◽  
Yu Mei Li ◽  
Qiu Dong He ◽  
Wen Jing Xuan
Keyword(s):  
Wear Mechanism ◽  
Friction And Wear ◽  
Wear Properties ◽  
Arc Erosion ◽  
Delamination Wear ◽  
Pin On Disc ◽  
The Coefficient Of Friction ◽  
Sliding Distance ◽  
High Temperature Rise ◽  
Sem Morphology

An experimental study on friction and wear properties of carbon strip rubbing against copper contact wire was carried out on a pin-on-disc frictional tester with and without windy conditions. The result shows that wear rate of pin specimen increases observably with increasing sliding distance with and without windy conditions. While the coefficient of friction slightly decreases with increasing of electric current with and without the wind. Observing the SEM morphology of pin specimens, it can be found that delamination wear is a main wear mechanism under no windy condition. While arc erosion is a dominant wear mechanism with windy condition. Worn surfaces of the materials were analyzed by an energy dispersive X-ray spectroscopy. It can be observed that oxidation wear occurs in the frictional process due to arc erosion and high temperature rise.

A Comparative Study of Tribological Behavior of Steel Sliding Against WC Under Mineral and Biodegradable Oil Lubrication

2012 ◽  
Author(s):  
Anup Darshan ◽  
UmaMaheshwera Reddy Paturi ◽  
Narala Suresh Kumar Reddy ◽  
Srinivasa Prakash Regalla
Keyword(s):  
Tribological Properties ◽  
Positive Impact ◽  
Research Work ◽  
Mineral Oil ◽  
Optical Microscope ◽  
Machining Processes ◽  
Alternative Source ◽  
Pin On Disc ◽  
Steel Disc ◽  
Machining Operations

Now a days for machining operations apart from good tribological properties, the lubricant is also expected to be non-hazardous and non-polluting. When considering the ecological and environmental aspects in machining processes, the use of biodegradable oil can be an alternative source of lubricant due to its positive impact to employee health and environmental pollution. In this regard, our research work uses vegetable based cutting fluids developed from canola and sunflower oil, in an attempt to provide an eco-friendly environment. Experiments are carried out on a pin-on-disc tribometer with tungsten carbide (WC) pin against AISI 4340 steel disc for different sliding times under different environments, thus simulating the machining environment. The tribological properties, wear and friction of vegetable based oils were comparatively investigated with a commercially available mineral oil. Wear tracks and roughness profiles of test specimens were compared by using optical microscope and profilometer respectively. Results indicated that vegetable based canola oil demonstrated excellent tribological properties compared to that of commercial mineral oil.

Sign in / Sign up

Export Citation Format

Share Document