Replication of white etching area evolution using novel modified dynamic load pin-on-disc tribometer on bearing steel

2018 ◽  
Vol 126 ◽  
pp. 336-343 ◽  
Author(s):  
K. Sreeraj ◽  
P. Ramkumar
Keyword(s):  
Dynamic Load ◽  
Bearing Steel ◽  
Pin On Disc ◽  
White Etching Area

scholarly journals Tribological characteristics of SCM 440 bearing steel under gas and oil lubricant in the cylinder block tractor engine

2018 ◽  
Vol 70 (8) ◽  
pp. 1361-1366 ◽  
Author(s):  
Okka Adiyanto ◽  
Pandu Sandi Pratama ◽  
Wonsik Choi
Keyword(s):  
Friction Coefficient ◽  
Characteristic Number ◽  
Bearing Steel ◽  
Cylinder Block ◽  
Oil Lubrication ◽  
Content Type ◽  
Paraffin Oil ◽  
Pin On Disc ◽  
Stribeck Curves ◽  
Tractor Engine

Purpose This paper aims to examine the friction coefficient and wear rate characteristics of SCM 440 bearing steel used in the cylinder block of a tractor engine with gas lubrication and oil lubrication. Design/methodology/approach Friction tests were performed using a pin-on-disc tester with loads of 2 to 10 N and sliding velocities of 0.06 to 0.34 m/s. The experiment was done with and without nitrogen, and paraffin oil lubricant was used to prevent wear during process. Findings The nondimensional characteristic number from the Stribeck curves indicated that the lubrication regime is hydrodynamic. As the velocity and load increased, the friction coefficient of the SCM 440 increased and greater applied load resulted in a smaller friction coefficient. The range of the friction coefficient was 0.017001 to 0.092904 with paraffin oil lubrication and 0.01614 to 0.4555 with nitrogen lubrication. Nitrogen is effective in reducing the friction coefficient of materials that are in contact and subjected to a load and velocity. Originality/value The experiments confirm that nitrogen is effective for reducing the friction coefficient of SCM 440 materials that are in contact with each other and subjected to a load and velocity.

Tribological Studies of Epoxy Composites With UHMWPE and MoS2 Fillers Coated on Bearing Steel: Dry Interface and Grease Lubrication

2020 ◽  
Vol 142 (5) ◽  
Author(s):  
Neha Singh ◽  
Sujeet K. Sinha
Keyword(s):  
Film Formation ◽  
Normal Load ◽  
Bearing Steel ◽  
Transfer Film ◽  
Wear Properties ◽  
Grease Lubrication ◽  
Pure Epoxy ◽  
Tribological Coatings ◽  
Pin On Disc ◽  
The Coefficient Of Friction

Abstract Epoxy with ultra-high molecular weight polyethylene (UHMWPE) and MoS2 fillers was coated on a bearing steel (SAE 52100). Frictional and wear properties of the coated samples in sliding contact were investigated on a pin-on-disc tribometer under a normal load of 10 N and a linear sliding speed of 1 m/s against a bearing steel ball. The optimized coating composition (72 wt% Epoxy + 7 wt% hardener + 18 wt% UHMWPE + 3 wt% MoS2) showed highly improved tribological properties compared to pure epoxy and other epoxy-based composites. There was 75% reduction in the coefficient of friction (COF) in the dry interfacial condition (COF reduced from 0.2 to 0.05) over pure epoxy and 80% reduction with grease as the lubricant. The specific wear-rate of the composite was lower by five orders of magnitude over that of pure epoxy. Other mechanical properties such as hardness, tensile strength, and Young's modulus of the composite showed increments of 86%, 121%, and 43%, respectively, with respect to those of pure epoxy. 2–3 wt% of MoS2 had drastic effects on improving strength and reducing friction and wear of the composites. For dry sliding, initial abrasive and adhesive wear mechanisms led to transfer film formation on the steel counterface, and the shearing was mainly within the transfer film. For the grease-lubricated case, a thin layer of grease helped in easy shearing, and the transfer film formation was avoided. This epoxy-based composite will have applications as tribological coatings for journal bearings.

Performance Evaluation of Hybrid (Ceramic on Steel) Bearings With Advanced Aircraft Engine Oils for Lubrication

2004 ◽  
Author(s):  
L. Wang ◽  
R. J. K. Wood ◽  
H. E. G. Powrie ◽  
E. Streit ◽  
I. Care
Keyword(s):  
Silicon Nitride ◽  
Aircraft Engine ◽  
Degradation Process ◽  
Bearing Steel ◽  
Material Transfer ◽  
Line Wear ◽  
Rolling Elements ◽  
Pin On Disc ◽  
Steel Disc ◽  
Synthetic Aviation

Hybrid bearings (silicon nitride rolling elements and steel raceways) are being developed for the new generation of gas turbine engines, as they offer weight savings, reduced heat rejection and can operate at higher DN (bore diameter in mm × shaft rotational speed in rpm) values than conventional steel bearings. In the present study, various advanced synthetic aviation oils were tested on a pin-on-disc tribometer. Conditions were chosen to simulate engine low load and ambient start up, where sliding is a factor. The tests used a silicon nitride ball sliding against an M50NiL bearing steel disc. Fresh oils were tested for the hybrid contacts under high sliding speed of 7 ms−1 and normal aircraft engine bearing contact pressure of 2.8 GPa [1]. The results showed that most of the synthetic aviation oils in use today would provide similar protection for the hybrid contacts against scuffing. Initial studies, aimed at identifying the influence of oil degradation and effects of additive depletion are also presented. The oils were ranked based on the contact wear rate. Electrostatic charge measurements were made along with wear, friction and surface temperature measurements to monitor the on-line wear conditions [2–3]. Electrostatic sensing shows promise as a monitoring technique for oil lubricated hybrid contacts. Polishing wear mechanisms and iron-based material transfer from disc to ball were identified by Field Emission Gun Scanning Electron Microscopy (FEG-SEM) and Energy-Dispersive X-ray (EDX) as the dominant degradation process in these hybrid contacts.

Study on Wear and Friction Resistance of CrTiAlMoN Coatings Deposited by Magnetron Sputtering

2011 ◽  
Vol 413 ◽  
pp. 295-299
Author(s):  
Tao Wang ◽  
Guo Jun Zhang ◽  
Bai Ling Jiang
Keyword(s):  
Carbon Steel ◽  
Magnetron Sputtering ◽  
Adhesive Wear ◽  
High Hardness ◽  
Bearing Steel ◽  
Friction Resistance ◽  
Wear And Friction ◽  
Pin On Disc ◽  
Friction Performance ◽  
Steel Substrates

The present research aims to synthesize a nanoscale multilayer CrTiAlMoN hard coating for the modification of wear and friction performance, as compare to CrTiAlN coatings. CrTiAlMoN coatings were deposited on 1045 carbon steel substrates by magnetron sputtering at different Mo target current. The wear and friction resistance were characterized by pin-on-disc test. When a WC-Co ball was used as the counterpart, the coefficients of friction of CrTiAlMoN coatings were found to decrease with the increase of Mo target current, with the lowest value (0.34) being only one half that of CrTiAlN coating (0.76). The combination of high hardness above 36GPa and low coefficients of friction reduces the specific wear rate of the CrTiAlMoN coatings to only 10% of CrTiAlN coatings. When tested against a bearing steel ball, results demonstrate that the effect of Mo on reducing friction of the CrTiAlMoN coatings is not significant and even negative due to adhesive wear.

Carbon based coatings for applications in friction couples with bearing steel and aluminium alloy

2017 ◽  
Vol 1 (87) ◽  
pp. 12-20
Author(s):  
M. Makówka ◽  
B. Wendler
Keyword(s):  
Tribological Properties ◽  
Steel Substrate ◽  
Bearing Steel ◽  
Friction Couple ◽  
Low Friction ◽  
Alsi Alloy ◽  
Pin On Disc ◽  
New Type ◽  
Steel Substrates ◽  
Carbon Based

Purpose: Low friction nc-WC/a-C:H coatings deposited by means of magnetron sputtering provide very good tribological properties in friction couple against hard steels and good adhesion to steel substrates. Nevertheless, it was necessary to elaborate a new type of coatings because the nc-WC/a-C:H one had no use in friction couple against aluminium alloys. Design/methodology/approach: In the paper the WC/a-C:H and (Si, Cr)C/a-C:H coatings were investigated. The coatings were investigated by means of SEM, EDS, in order to obtain thickness, surface morphology and chemical composition of coatings. Tribological properties of deposited coatings were elaborated by means of 'pin-on-disc' method in friction couple against 100Cr6 bearing steel and AlSi alloy. Findings: It was stated that (Si, Cr)C/a-C:H coatings have very good tribological properties in friction couple against bearing steel and AlSi alloy (friction coefficient <0,1). In case of WC/a-C:H coatings, good tribological properties were achieved in friction couple with bearing steel. Both coatings have very low wear rate in investigated friction couples. Research limitations/implications: The (Si,Cr)C/a-C:H coating have a worse quality of adhesion to quenched and tempered Vanadis 23 HS steel substrate in comparison with the nc-WC/a-C:H coating. Resolving this disadvantage can increase potential of application of (Si, Cr)C/a-C:H coatings. Practical implications: Newly developed (Si, Cr)C/a-C:H coating has a greater application potential for modification of surfaces of elements working in friction couples against hardened steels and light alloys like AlSi. Originality/value: There are numerous publications where low friction carbon based coatings were described mostly as a coatings deposited on elements working in friction couples against hard steels. Undertaken tests showed that the newly developed (Si,Cr)C/a- C:H coating can have a broad spectrum of applications in friction couples against different counterbodies, including light Al alloys.

scholarly journals Formation Process of White Etching Area under Rolling Contact in Bearing Steel

2003 ◽  
Vol 89 (7) ◽  
pp. 789-795 ◽  
Author(s):  
Hisashi HARADA ◽  
Noriyasu OGUMA ◽  
Atsushi YAMAMOTO ◽  
Harushige TSUBAKINO
Keyword(s):  
Formation Process ◽  
Bearing Steel ◽  
Rolling Contact ◽  
White Etching Area
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