scholarly journals The role of synthetic oils in controlling hydrogen permeation of rolling/sliding contacts

RSC Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 726-738
Author(s):  
Hiroyoshi Tanaka ◽  
Monica Ratoi ◽  
Joichi Sugimura
Keyword(s):  
Wear Rate ◽  
Hydrogen Content ◽  
Wear Track ◽  
Hydrogen Permeation ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Sliding Contacts ◽  
Base Oil ◽  
Oil Type

Hydrogen content and wear rate in bearing steel under rolling contact depend on the base oil type and the composition of tribofilm they generate on the wear track.

Observation of Wear in Induction-Heat-Treated Bearing Steel Bars under Reciprocating Motion

2012 ◽  
Vol 457-458 ◽  
pp. 504-510
Author(s):  
Masatoshi Koga ◽  
Edson Costa Santos ◽  
Takashi Honda ◽  
Katsuyuki Kida ◽  
Takuya Shibukawa
Keyword(s):  
Retained Austenite ◽  
Evaluation Method ◽  
Wear Track ◽  
Fatigue Testing ◽  
High Hardness ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Estimation Methods ◽  
Reciprocating Motion ◽  
Heat Treated

Due to its high hardness and wear resistance under rolling contact, AISI E52100 steel (JIS SUJ2) is used in the manufacture of bearings and linear guides. The life estimation methods for components working under rolling contact developed up to now were designed for bearings. In this study, fatigue testing under reciprocating motion was performed and based on the microstructure, wear track investigation as well as hardness and retained austenite measurements, an evaluation method for linear guides is proposed. The results obtained from three different areas of the sample including wear tracks and non-damaged area are as follows: (1) there was little microstructure difference between the center and the end of the wear track; (2) a clear difference of the retained austenite content at the wear track and at the non-damaged area could be observed, however the percentage within different areas inside the track was similar.

The effects of surface conditioning and gear oil type on friction and wear behavior under sliding condition

2017 ◽  
Vol 232 (1) ◽  
pp. 73-84 ◽  
Author(s):  
IS Tertuliano ◽  
TP Figueiredo ◽  
GAA Machado ◽  
T Cousseau ◽  
A Sinatora ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Wear Behavior ◽  
Bulk Material ◽  
Bearing Steel ◽  
Additive Package ◽  
Base Oil ◽  
Surface Conditioning ◽  
3D Profilometry ◽  
Gear Oils ◽  
Oil Type

Highly additized low viscous lubricants, new coatings, and surface treatments have been employed by original equipment manufacturers in several tribosystems to reduce emission and fuel consumption. In this sense, this work investigates the tribological response of four different advanced fully formulated gear oils and three different materials (coatings and topography) in terms of friction and wear using a ball-on-disc test rig under pure unidirectional sliding condition and boundary lubrication. The tested lubricants had different base oils: mineral, semi-synthetic, and synthetic with different additive packages. The ball's material was AISI 52100 bearing steel and the bulk material of the tested specimens (discs) were SAE 4320 steel with surface as follows: (i) ground; (ii) subjected to ceramic shot peening (CSP) and, (iii) coated with WC/C. Optical and scanning electron microscopy and 3D profilometry were used to evaluate the wear track and tribofilm formation. It was found that the frictional dependence on the surface topography and lubricant type is not significant, whilst the wear mechanisms were highly dependent on material and surface conditioning. The harder and rougher the contact body, the higher the wear produced in the counter body. At the harsher conditions base oil type control wear more effectively than the additive package.

Wear Mechanism of Ceramic Materials in Dry Rolling Friction

1986 ◽  
Vol 108 (4) ◽  
pp. 522-526 ◽  
Author(s):  
S. S. Kim ◽  
K. Kato ◽  
K. Hokkirigawa ◽  
H. Abe´
Keyword(s):  
Silicon Nitride ◽  
Wear Rate ◽  
Contact Area ◽  
Ceramic Materials ◽  
Rolling Friction ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Hertzian Contact ◽  
Real Contact Area ◽  
Wear Process

Wear tests in dry rolling contact were carried out at room temperature on five ceramic materials, such as silicon nitride, silicon carbide, cermet, titania, and alumina. The results showed that wear rate of silicon nitride was smaller than any of the other ceramic materials and bearing steel. Observations of worn surface and wear debris revealed that ceramic materials have two types of wear, one related to real contact area and another related to Hertzian contact area. It was also found that brittle fracture dominates the wear process of ceramic materials in dry rolling contact. Based on the experimental results, wear rate of ceramic materials was expressed with a new nondimensional parameter.

Innovative approach to evaluate the wearing of nano TiO2 doped alumina ceramics in the light of image modelling

2021 ◽  
pp. 1-17
Author(s):  
Partha Haldar ◽  
Alok Mukherjee ◽  
Tapas Kumar Bhattacharya ◽  
Nipu Modak
Keyword(s):  
Wear Rate ◽  
Wear Track ◽  
Specific Wear Rate ◽  
Edge Density ◽  
Alumina Ceramics ◽  
Nano Tio2 ◽  
Image Histogram ◽  
Wide Range ◽  
Density Index ◽  
Sobel Edge Detection

Abstract The present research is emphasized on the microscopic observation of post wear surface of nano TiO2 doped alumina ceramics to accesses wearing by promising image processing algorithms viz. entropy analysis, Sobel edge detection technique and entropy filtered image histogram analysis in relation to the extent of doping. The experimental results of specific wear rate showed an indicator with the extent of micro fracturing of grains, ploughing of materials and debris formation on the wear track after a long wear cycles in terms of entropy level, edge density index, entropy filtered image and the nature of histogram at different doping level. The lowest value of entropy level and edge density index is shown at the level of 1 wt.% TiO2 doped alumina ceramics due to the presence of low number of granularity and microfracture grains on the wear track causes the lowering of specific wear rate. The histogram of entropy filtered image for 1 wt.% doping is more uniformly distributed with the highest frequency and lowest skewness factor over a wide range of intensity values for 1 wt.% doping.

Synergistic Antiwear Effects of Zinc Dialkyl Dithiophosphate and Different Detergents

2008 ◽  
Author(s):  
G. Pennecot ◽  
K. Komvopoulos ◽  
E. S. Yamaguchi
Keyword(s):  
Wear Rate ◽  
Boundary Lubrication ◽  
Base Oil ◽  
Temperature Range ◽  
Zinc Dialkyl Dithiophosphate ◽  
Contact Voltage ◽  
Lubrication Regime ◽  
Steel Surfaces ◽  
Dialkyl Dithiophosphate ◽  
Insight Into

The effectiveness of blends consisting of base oil, some secondary zinc dialkyl dithiophosphate (ZDDP), and different detergents to form antiwear tribofilms on steel surfaces sliding in the boundary lubrication regime was investigated in the temperature range of 105–125°C. The efficacy of the tribofilms formed from these blends was evaluated in terms of contact voltage and wear rate measurements. The best antiwear performance was demonstrated by the tribofilm formed from the blend containing sulphonate detergent. The results of this study provide insight into competing effects between ZDDP and different detergents that affect significantly the antiwear performance of the formed tribofilms.

Effect of Repeated Quenching on the Rotating Bending Strength of SAE52100 Bearing Steel

2012 ◽  
Vol 457-458 ◽  
pp. 1025-1031 ◽  
Author(s):  
Koshiro Mizobe ◽  
Edson Costa Santos ◽  
Takashi Honda ◽  
Hitonobu Koike ◽  
Katsuyuki Kida ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Bending Strength ◽  
High Strength ◽  
Bearing Steel ◽  
Rolling Contact ◽  
High Wear Resistance ◽  
High Carbon ◽  
Austenite Grain ◽  
High Fatigue ◽  
Rotating Bending

Martensitic high carbon high strength SAE 52100 bearing steel is one of the main alloys used for rolling contact applications where high wear resistance are required. Due to its high fatigue strength, SAE 52100 is recently being used not only for the production of bearings but also shafts. Refining of prior austenite grain through repeated quenching is a procedure that can be used to enhance the material’s strength. In this work, the microstructure of repeatedly quenched SAE 52100 steel and its fatigue strength under rotating bending were investigated. It was found that repeated furnace heating and quenching effectively refined the martensitic structure and increased the retained austenite content. Repeated quenching was found to improve the fatigue strength of SAE 52100.

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