Surface Integrity of Ti6Al4V Alloy under Dry Sliding Conditions

2013 ◽  
Vol 371 ◽  
pp. 126-130
Author(s):  
Zinaida Doni ◽  
Mihaela Buciumeanu ◽  
Liviu Palaghian
Keyword(s):  
Weight Loss ◽  
Surface Topography ◽  
Coefficient Of Friction ◽  
Surface Integrity ◽  
Applied Load ◽  
Normal Load ◽  
Bearing Steel ◽  
Ti6al4v Alloy ◽  
Dry Sliding ◽  
Roughness Parameters

The present paper is aimed to investigate the evolution of the surface integrity of Ti6Al4V alloy under reciprocating sliding in contact with bearing steel and ceramic balls (Al2O3). The evolution of the surface integrity states is characterized by the evolution of the surface topography and 3D roughness parameters with the applied normal load. The tribological characteristics (coefficient of friction and weight loss) are also presented for the two contact pairs used in this study. This study has proved that Ti6Al4V/Al2O3 contact pair can be used in applications were the applied load is variable.

scholarly journals Tribological Aspects, Optimization and Analysis of Cu-B-CrC Composites Fabricated by Powder Metallurgy

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4217
Author(s):  
Üsame Ali Usca ◽  
Mahir Uzun ◽  
Mustafa Kuntoğlu ◽  
Serhat Şap ◽  
Khaled Giasin ◽  
...  
Keyword(s):  
Weight Loss ◽  
Wear Rate ◽  
Coefficient Of Friction ◽  
Applied Load ◽  
Practical Significance ◽  
Tribological Characteristics ◽  
M 10 ◽  
Wide Range ◽  
The Coefficient Of Friction ◽  
Four Levels

Tribological properties of engineering components are a key issue due to their effect on the operational performance factors such as wear, surface characteristics, service life and in situ behavior. Thus, for better component quality, process parameters have major importance, especially for metal matrix composites (MMCs), which are a special class of materials used in a wide range of engineering applications including but not limited to structural, automotive and aeronautics. This paper deals with the tribological behavior of Cu-B-CrC composites (Cu-main matrix, B-CrC-reinforcement by 0, 2.5, 5 and 7.5 wt.%). The tribological characteristics investigated in this study are the coefficient of friction, wear rate and weight loss. For this purpose, four levels of sliding distance (1000, 1500, 2000 and 2500 m) and four levels of applied load (10, 15, 20 and 25 N) were used. In addition, two levels of sliding velocity (1 and 1.5 m/s), two levels of sintering time (1 and 2 h) and two sintering temperatures (1000 and 1050 °C) were used. Taguchi’s L16 orthogonal array was used to statistically analyze the aforementioned input parameters and to determine their best levels which give the desired values for the analyzed tribological characteristics. The results were analyzed by statistical analysis, optimization and 3D surface plots. Accordingly, it was determined that the most effective factor for wear rate, weight loss and friction coefficients is the contribution rate. According to signal-to-noise ratios, optimum solutions can be sorted as: the highest levels of parameters except for applied load and reinforcement ratio (2500 m, 10 N, 1.5 m/s, 2 h, 1050 °C and 0 wt.%) for wear rate, certain levels of all parameters (1000 m, 10 N, 1.5 m/s, 2 h, 1050 °C and 2.5 wt.%) for weight loss and 1000 m, 15 N, 1 m/s, 1 h, 1000 °C and 0 wt.% for the coefficient of friction. The comprehensive analysis of findings has practical significance and provides valuable information for a composite material from the production phase to the actual working conditions.

Modelling the tribological response in dry sliding of boron modified as-cast Ti6Al4V on hardened steel

2021 ◽  
pp. 135065012110592
Author(s):  
Palash Roy Choudhury ◽  
Korimilli Eswar Prasad ◽  
John K. Schueller ◽  
Abhijit Bhattacharyya
Keyword(s):  
Wear Rate ◽  
Coefficient Of Friction ◽  
Boron Content ◽  
Normal Load ◽  
Operating Conditions ◽  
Dry Sliding ◽  
Contour Plots ◽  
The Coefficient Of Friction ◽  
En 31 ◽  
Full Factorial

Tribological characteristics of boron modified as-cast Ti6Al4V alloys are not very well known, but these alloys enjoy improved as-cast mechanical properties and favourable manufacturing economy. Experimental results are reported here for the effects of sliding speed and normal load on the wear rate and the coefficient of friction in dry sliding of these alloys on hardened EN 31 steel. Alloys having 0%, 0.30%, and 0.55% boron by weight were tested. A full factorial experiment assessed the effects of boron content, speed, and load on wear and friction. Interactions between speed and load were found to be statistically significant in influencing the wear rate and the coefficient of friction. Regression models are developed to predict the wear rate and coefficient of friction responses. The developed contour plots can assist designers in choosing operating conditions when selecting these alloys even if the wear mechanisms are unknown. Evidence shows that the wear resistance of Ti6Al4V can be improved by boron addition, and wear regimes are sensitive to boron content.

INVESTIGATION ON DRY SLIDING WEAR BEHAVIOR OF TITANIUM DIOXIDE-REINFORCED MAGNESIUM MATRIX COMPOSITE

2021 ◽  
pp. 2150106
Author(s):  
P. C. ELUMALAI ◽  
R. GANESH
Keyword(s):  
Titanium Dioxide ◽  
Wear Rate ◽  
Coefficient Of Friction ◽  
Wear Mechanisms ◽  
Sliding Wear ◽  
Normal Load ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Sliding Velocity ◽  
Significant Change

In this work, the dry sliding wear behaviors of pure monolithic magnesium and magnesium–titanium dioxide (Mg–TiO2) composites were studied using pin-on-disc tribometer against an oil-hardened nonshrinking die steel (OHNS) counter-disc with a normal load of 0.5–2[Formula: see text]kg and a sliding velocity of 1.5–2.5[Formula: see text][Formula: see text] with the sliding distance and wear track diameter of 1500[Formula: see text]m and 90[Formula: see text]mm, respectively. The pin samples were characterized for their microstructural, nanomechanical and tribological properties such as wear rate, coefficient of friction and wear fractographs. Scanning electron microscopy (SEM) was used to analyze the worn-out surfaces of each pin sample in order to identify the different types of wear and wear mechanisms and the chemical constituents of each element were quantified by energy-dispersive spectroscopy. The influence of TiO2 reinforcements on the nanomechanical behavior was studied by nanoindentation technique. As compared with pure Mg, the nanoindentation strengths of Mg–1.5TiO2, Mg–2.5TiO2 and Mg–5TiO2 composites were found to increase by 11.9%, 22.2% and 35.8%, respectively, which was due to the addition of TiO2 particles and also due to the good bonding at the interface of TiO2 and magnesium particles. From the wear test results, a significant change in wear rate was observed with the change in normal load than that of sliding speed, whereas a significant change in coefficient of friction was noticed with the changes in both normal load and sliding velocity. The dominant wear mechanisms involved under the testing conditions were identified through plotting the contour maps and SEM fractographs. Also, from the fractographs it was noticed that delamination and plowing effect have been the significant wear mechanisms observed during low wear rate of samples, whereas melting, delamination and oxidation wear have been observed during high wear rate of pure Mg and its composites.

Experimental Study on Tribological Properties of Graphite-MoS2 Coating on GCr15

2018 ◽  
Vol 140 (5) ◽  
Author(s):  
F. M. Meng ◽  
Z. T. Cui ◽  
Z. T. Cheng ◽  
H. L. Han
Keyword(s):  
Experimental Study ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Rotational Speed ◽  
Applied Load ◽  
Bearing Steel ◽  
Experimental Results ◽  
Gcr15 Bearing Steel ◽  
Mos2 Coating ◽  
Scar Width

The graphite-MoS2 coated on GCr15 bearing steel is prepared through air spraying and its tribological performances are investigated experimentally. Then its coefficient of friction (COF) and wear scar width (WSW) are investigated through the MFT-5000 multifunction tribometer and other test equipments. The experimental results show that the addition of the graphite can effectively decrease the COF and narrow the WSW of the MoS2. There exists a critical applied load for wearing out the surface with the graphite-MoS2 coating. Moreover, there exists an optimal rotational speed of 500 rpm to decrease the COF and WSW of the GCr15 steel.

An investigation on dry sliding wear behaviour of pressure infiltrated AA1050-XMg/B4C composites

2018 ◽  
Vol 25 (1) ◽  
pp. 67-73 ◽  
Author(s):  
Engin Cevik ◽  
Yavuz Sun ◽  
Yunus Turen ◽  
Hayrettin Ahlatci
Keyword(s):  
Weight Loss ◽  
Sliding Wear ◽  
Applied Load ◽  
Volume Fraction ◽  
Particle Volume Fraction ◽  
Wear Behaviour ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Pressure Infiltration ◽  
Sliding Wear Behaviour

AbstractIn this study, the effect of Mg alloying addition (1–4 wt.%) on dry sliding wear behaviour of AA1050 matrix composites was investigated. Composites were produced by the pressure infiltration technique at 800°C and had a B4C particle volume fraction of 60%. Reinforcement particles were uniformly distributed in the aluminium matrix. Compared with the AA1050 matrix, the weight loss of the composites decreased with increasing Mg content. The wear rate of the composites increased when the applied load and sliding distance were increased. The results show that when the applied load reaches critical values (30 N), the weight loss increases significantly.

Tribological Characterization of AZ91 and AE42 Magnesium Alloys in Fretting Contact

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
D. Khabale ◽  
M. F. Wani
Keyword(s):  
Magnesium Alloys ◽  
Coefficient Of Friction ◽  
Normal Load ◽  
Fretting Wear ◽  
Wear Volume ◽  
Dry Sliding ◽  
Running Time ◽  
Average Coefficient ◽  
Tribological Characterization

Fretting wear studies were conducted on AZ91 and AE42 magnesium alloys against steel ball. Average coefficient of friction (COF) remains steady with the increase in running time. However, average coefficient of friction decreases with the increase in normal load and frequency and marginally increases with the increase in amplitude. A constant average coefficient of friction of 0.06 was observed for both AZ91 and AE42 under dry sliding conditions at normal load of 50 N. Wear volume increases linearly with increasing running time. Wear volume first decreases sharply, attains minima, and then increases marginally with the increase in normal load. However, wear volume increases with increasing amplitude and frequency. Higher specific wear rate of 10.5 × 10−6 mm3 N−1·m−1 was observed for AE42, as compared to 4.5 × 10−6 mm3 N−1·m−1 for AZ91. The wear in magnesium alloy was caused by a combination of adhesion, abrasion, oxidation, delamination, and plastic deformation under different fretting conditions.

scholarly journals Tribological studies of different bioimplant materials for orthopedic application using Taguchi experimental design

2021 ◽  
Vol 38 (3−4) ◽  
Author(s):  
Sachin Solanke ◽  
Vivek Gaval
Keyword(s):  
Weight Loss ◽  
Coefficient Of Friction ◽  
Friction And Wear ◽  
Normal Load ◽  
Individual Contribution ◽  
Sliding Velocity ◽  
Wear Weight Loss ◽  
Taguchi Design Of Experiments ◽  
The Coefficient Of Friction ◽  
Material Factor

In this research ball on disc wear tests have been carried out with ASTM G-99 standard at room temperature in simulated body fluid. The tribological property such as the coefficient of friction and wear weight loss was studied by using the Taguchi design of experiments. The design of the experiment was done using L8 orthogonal array to determine the collective contribution of the wear parameters. An analysis of variance demonstrated that the individual contribution of type of material factor was 97.15% and 66.66% for the coefficient of friction and wear weight loss respectively, which is the highest individual contribution as compared to other factors. It was concluded that the coefficient of friction and wear weight loss is mainly influenced by type of material factor. The analysis of the signal-to-noise ratio shows that the optimal coefficient of friction and wear weight loss was obtained with CoCrMo material at an applied normal load of 5 N with a sliding velocity of 0.05 m/s for a track diameter of 30 mm. To check the accuracy of results a confirmation test was carried out which indicates that predicted values are very close to the experimental values and the model is significant to predict the coefficient of friction. The results showed that the coefficient of friction and wear weight loss increases with increasing the applied load and sliding velocity. The microstructure of all substrates materials was analyzed using a scanning electron microscope. Wear track study showed that adhesive dominant wear mechanism for all four different substrate materials.

EFFECTS OF SURFACE PREPARATION ON FRICTION AND WEAR IN DRY SLIDING CONDITIONS

Tribologia ◽  
2017 ◽  
Vol 272 (2) ◽  
pp. 25-31
Author(s):  
Andrzej DZIERWA
Keyword(s):  
Surface Topography ◽  
Friction And Wear ◽  
Normal Load ◽  
Surface Preparation ◽  
Wear Volume ◽  
Dry Sliding ◽  
Initial Surface ◽  
Steel Disc ◽  
Similar Range ◽  
Sliding Distance

Wear tests were conducted using a ball-on-disc tester T-11. In the experiment, a 42CrMo4 rotating steel disc with a hardness of 40±2 HRC was placed in contact with a 100Cr6 steel ball with a diameter of 6.35 [mm]. The hardness of the ball was set to 62±2 HRC. Finishing treatment applied to the surfaces was sand blasting. Disc samples were prepared to obtain surfaces in similar range of the Sa parameter (arithmetical mean height of the surface) but other surface topography parameters vary. Dry sliding tests were conducted at sliding speeds of v1 = 0.16; v2 = 0.24 i v3 = 0.32 [m/s]. The sliding distance was set to 282.6 [m], and the normal load was set to 9.81 [N]. During the tests, the friction force was monitored as a function of time. Disc and ball wear was measured after the tests using a white light interferometer Talysurf CCI Lite. Profiles were taken in four positions (900 apart) perpendicular to the wear track. Then, using an interferometer software program TalyMap Gold 6.0, they were computed and averaged. It was found that the initial surface topography has a significant influence on friction and wear levels under dry sliding conditions. It was also identified the correlation between several surface topography parameters and wear volume.

scholarly journals Microstructural Characterization and Evaluation of Sliding Wear of Hastelloy C276 under Different Loading Conditions

2019 ◽  
Vol 8 (12) ◽  
pp. 2841-2845
Keyword(s):  
Wear Rate ◽  
Coefficient Of Friction ◽  
Frictional Force ◽  
Sliding Wear ◽  
Normal Load ◽  
Dry Sliding Wear ◽  
Material Surface ◽  
Dry Sliding ◽  
Loading Conditions ◽  
Sem Images

Hastelloy C276 is investigated for dry sliding wear against an EN 31 stainless steel (hardness 60 HRC) at 298 K. The tribological properties such as frictional force, coefficient of friction and the wear rate on the material surface at different sliding distance are examined under different loading conditions. In the dry wear test at 40 N load, the wear rate increased by 300% as compared to 10, 20, 30 N loading conditions. The experimental results indicated reduction in coefficient of friction values and thus an increase in the frictional force with the increase in normal load. SEM images of worn out surfaces confirm that the delamination and adhesion causes the material removal from the surface in dry sliding. Further, the analysis of the hardness characteristics of worn out surfaces shows surface hardening during sliding wear process under 40 N load

Effect of Micro-Size Cenosphere Content on Friction and Dry Sliding Wear Behavior of Vinylester Composites – A Taguchi Method

2012 ◽  
Vol 585 ◽  
pp. 569-573 ◽  
Author(s):  
S.R. Chauhan ◽  
Sunil Thakur
Keyword(s):  
Wear Rate ◽  
Coefficient Of Friction ◽  
Sliding Wear ◽  
Friction And Wear ◽  
Normal Load ◽  
Dry Sliding ◽  
Sliding Speed ◽  
Applied Normal Load ◽  
The Coefficient Of Friction ◽  
Sliding Distance

In this paper the friction and wear characteristics of vinylester and vinylester composites have been investigated under dry sliding conditions for different applied normal load, sliding speed and sliding distance. The experiments have been carried on a pin on disc arrangement at normal room temperature conditions. The influence of friction and wear parameters like normal load, speed, sliding distance and percentage of filler content on the friction and wear rate has been investigated. In this study, a plan of experiments based on the techniques of Taguchi was performed to acquire data in a controlled way. An orthogonal array L27 (313) and Analysis of variance (ANOVA) were applied to investigate the influence of process parameters on the coefficient of friction and sliding wear behaviour of these composites. The Taguchi design of experiment approach eliminates the need for repeated experiments and thus saves time, material and cost. The results showed that with increase in the applied normal load and sliding speed the coefficient of friction and specific wear rate decreases under dry sliding conditions. It is also found that a thin film formed on the counterface seems to be effective in improving the tribological characteristics. The results showed that the inclusion of cenosphere as filler materials in vinylester composites will increase the wear resistance of the composite significantly.

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