scholarly journals High-Temperature Tribological Behavior of the Ti-22Al-25Nb (at. %) Orthorhombic Alloy with Lamellar O Microstructures

Metals ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 5 ◽  
Author(s):  
Wei Wang ◽  
Haixiong Zhou ◽  
Qingjuan Wang ◽  
Jie Jin ◽  
Yaling Sun ◽  
...  
Keyword(s):  
Wear Rate ◽  
Tribological Behavior ◽  
Wear Behavior ◽  
Friction Pair ◽  
Heat Treated ◽  
The Coefficient Of Friction ◽  
Friction Temperature ◽  
Higher Temperature ◽  
Lower Temperature ◽  
Orthorhombic Alloy

Tribological behavior of the isothermally forged and heat-treated Ti-22Al-25Nb (at. %) orthorhombic alloy with lamellar O microstructures was investigated. The friction experiments using a tribometer (UMT-3 CETR) against Si3N4 and Al2O3 were conducted at the load of 10N from 20 to 750 °C and a constant speed of 0.188 m/s. The experiment results indicated that for the friction pair of Al2O3, the coefficient of friction (COF) was decreased from 0.906–0.359, and for the friction pair of Si3N4, COF was decreased from 0.784–0.457 as the friction temperature increased from room temperature to 750 °C. The wear rate of the alloy against Al2O3 is in the range of 2.63–8.15 × 10−4 mm3N−1m−1, the wear rate against Si3N4 is in the range of 2.44–5.83 × 10−4 mm3N−1m−1, respectively. The wear mechanisms of the alloy were changed from plastic deformation and ploughing at lower temperature (20–400 °C) to adhesive wear and oxidative mechanism at higher temperature (600 and 750 °C). The friction and wear behavior of the Al2O3 friction pair was comparable to that of the Si3N4 friction pair.

Effect of copper incorporation on phase transformation behavior of electroless nickel–phosphorous coating and its effect on the tribological behavior

2020 ◽  
pp. 146442072098160
Author(s):  
Abhijit Biswas ◽  
Suman Kalyan Das ◽  
Prasanta Sahoo
Keyword(s):  
Heat Treatment ◽  
Phase Transformation ◽  
Tribological Behavior ◽  
Electroless Nickel ◽  
Two Phase ◽  
Microstructural Changes ◽  
Treatment Conditions ◽  
Heat Treated ◽  
Higher Temperature ◽  
Effect Of Copper

The microstructural changes of electroless Ni–P–Cu coating at various heat-treatment conditions are investigated to understand its implications on the tribological behavior of the coating. Coatings are heat-treated at temperatures ranging between 200°C and 800 °C and for 1–4 h duration. Ni–P–Cu coatings exhibit two-phase transformations in the temperature range of 350–450 °C and the resulting microstructural changes are found to significantly affect their thermal stability and tribological attributes. Hardness of the coating doubles when heat-treated at 452 °C, due to the formation of harder Ni3P phase and crystalline NiCu. Better friction and wear performance are also noted upon heat treatment of the coating at the phase transformation regime, particularly at 400 °C. Wear mechanism is characterized by a mixed adhesive cum abrasive wear phenomena. Heat treatment at higher temperature (600 °C and above) and longer duration (4 h) results in grain coarsening phenomenon, which negatively influences the hardness and tribological characteristics of the coating. Besides, diffusion of iron from the ferrous substrate as well as greater oxide formation are noticed when the coating is heat-treated at higher temperatures and for longer durations (4 h).

Dry Slide Wear Behavior of Graphite and SiC, TiO2 Filled the Unidirectional Glass-Epoxy Composites

2017 ◽  
Vol 25 (3) ◽  
pp. 193-198 ◽  
Author(s):  
A. Madhanagopal ◽  
S. Gopalakannan
Keyword(s):  
Wear Rate ◽  
Coefficient Of Friction ◽  
Wear Behavior ◽  
Specific Wear Rate ◽  
Dry Sliding ◽  
Testing Time ◽  
Time Duration ◽  
Sem Images ◽  
Unidirectional Glass ◽  
The Coefficient Of Friction

This study determines the friction and the wear properties of the unidirectional glass epoxy composite with Gr, SiC TiO2 powder by using pin on disk apparatus. This tribological data is obtained in dry sliding condition for a constant sliding time of 30 minutes. Test specimens are prepared using hand lay-up process and by varying the different (2, 5, 7) percentage each of graphite and SiC, TiO2 particles addition for the combination of fiber and matrix. The tests are performed by varying the operating parameters of contact pressure (p) and velocity (v). The composites (2% 5%, and 7%) are worn by dry sliding at the steel counter face under ambient conditions. The coefficient of friction reaches maximum of 0.78 at 2 kg load, 2 m/s velocity with testing time duration of 24 min. whereas 5%, 7% sample shows the coefficient of friction 0.28, 0.25 respectively. The specific wear rate value drops to 0.79 (mm3/N-m×10−6) at 2 kg load at 2 m/s velocity for the 5% specimen. The maximum reduction in the specific wear rate at 3 kg load, 1m/s velocity is 32.7 percentages, 5.63 percentages for the 5,7 percentage specimen compared to 2% specimen for the graphite and SiC, TiO2 particle filled composite specimen respectively. The SEM images are also taken to support the results.

The Sliding Wear Behavior of Titanium Carbide Dispersion-Reinforced Steel

2007 ◽  
Vol 124-126 ◽  
pp. 1573-1576
Author(s):  
Jeong Keun Lee
Keyword(s):  
Wear Rate ◽  
Titanium Carbide ◽  
Sliding Wear ◽  
Wear Track ◽  
Tribological Behavior ◽  
Wear Behavior ◽  
Matrix Composites ◽  
Powder Metallurgy Technique ◽  
Sliding Velocity ◽  
Reinforced Steel

The tribological behavior of TiC-based metal matrix composites was investigated via measuring counterpart weight. The composites were prepared using powder metallurgy technique. Wear of counterpart by the composites varying from 35 to 45 % by volume Titanium carbide were observed over a load ranges of 9.81 to 49.05 N and sliding velocities of 2.0, 2.2, 2.4, 2.6, 2.8 and 3.0 m/sec. Detailed wear track micro-graphy was done to verify the effect of sliding condition on wear mechanism. Observations indicate that wear rate of counterpart increases with the increase in load and the sliding velocity and discontinuous wear rate change occurs at a certain load.

Friction and Wear Studies on Polyphenylene Sulfide Filled with a Complex Mixture

2012 ◽  
Vol 184-185 ◽  
pp. 1400-1403
Author(s):  
Li Guo ◽  
Huan Qin Zhu ◽  
Yuan Bao Sun
Keyword(s):  
Wear Rate ◽  
Friction And Wear ◽  
Narrow Range ◽  
Tribological Behavior ◽  
Complex Mixture ◽  
Polyphenylene Sulfide ◽  
Particulate Form ◽  
The Coefficient Of Friction ◽  
Molybdenum Concentrate ◽  
Counterface Roughness

The tribological behavior of PPS filled with molybdenum-concentrate (MC) deposit from Armenia was studied. The deposit MC was a complex mixture of compounds such as MoS2, SO2, CuS, Al2O3, and others. Whereas MC as the filler in particulate form reduced the steady state wear rate of PPS, the optimum reduction in wear was found to occur with the addition of PTFE along with PPS. The behavior of PPS composites made with MC and PTFE sliding against a steel counterface was investigated as a function of the MC and PTFE proportions, sliding speed, and counterface roughness. Of all the above factors, the change in MC proportion, while PTFE was also present, had the greatest effect on the reduction in wear rate. The variation of the coefficient of friction was found to be in the narrow range of 0.27-0.33. The lowest wear rate was found in the case of PPS+ 17vol.%MC+10vol.%PTFE composite sliding at 1.5 m/s against a counterface roughness of 0.1 μm Ra.

scholarly journals Tribological Behavior of 42CrMo4 Steel Nitrided by Plasma

2015 ◽  
Vol 21 (3) ◽  
pp. 220 ◽  
Author(s):  
Okba Belahssen ◽  
Abdelouahed Chala ◽  
Okba Belahssen ◽  
Said Benramache
Keyword(s):  
Wear Rate ◽  
Tribological Behavior ◽  
Wear Behavior ◽  
Plasma Nitriding ◽  
Surface Hardness ◽  
Compound Layer ◽  
42Crmo4 Steel ◽  
Layer Increase ◽  
Pin On Disk ◽  
Microhardness Tester

<p>This paper presents wear behavior of the plasma nitride 42CrMo4 steel. This steel is used in mechanical industry; it has been assessed by evaluating tribological properties and surface hardness by using a pin-on-disk wear machine and microhardness tester. Experimental results showed that the nitrides ε-Fe<sub>2-3</sub>N and γ’-Fe<sub>4</sub>N present in the compound layer increase the microhardness. It is found that plasma nitriding improves the wear rate and the presence of a hard and brittle compound layer on the surface causes an increase in wear of the specimen surface.</p>

scholarly journals Wear Behavior of a Heat-Treatable Al-3.5Cu-1.5 Mg-1Si Alloy Manufactured by Selective Laser Melting

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7048
Author(s):  
Pei Wang ◽  
Yang Lei ◽  
Jun-Fang Qi ◽  
Si-Jie Yu ◽  
Rossitza Setchi ◽  
...  
Keyword(s):  
Wear Rate ◽  
Selective Laser Melting ◽  
Coefficient Of Friction ◽  
Mechanical Performance ◽  
Wear Behavior ◽  
Secondary Phase ◽  
Specific Wear Rate ◽  
Laser Melting ◽  
Heat Treated ◽  
Average Coefficient

In this study, the wear behavior of a heat-treatable Al-7Si-0.5Mg-0.5Cu alloy fabricated by selective laser melting was investigated systematically. Compared with the commercial homogenized AA2024 alloy, the fine secondary phase of the SLM Al-Cu-Mg-Si alloy leads to a low specific wear rate (1.8 ± 0.11 × 10−4 mm3(Nm)−1) and a low average coefficient of friction (0.40 ± 0.01). After the T6 heat treatment, the SLM Al-Cu-Mg-Si alloy exhibits a lower specific wear rate (1.48 ± 0.02 × 10−4 mm3(Nm)−1), but a similar average coefficient of friction (0.34 ± 0.01) as the heat-treated AA2024 alloy. Altogether, the SLM Al-3.5Cu-1.5 Mg-1Si alloy is suitable for the achievement of not only superior mechanical performance, but also improved tribological properties.

Effect of Hardness and Position on Wear Behavior of Steel Pairs

2012 ◽  
Vol 263-266 ◽  
pp. 95-98
Author(s):  
Zhu Jun Li ◽  
Zheng Wu Jiang ◽  
Huan Wei Zhou
Keyword(s):  
Friction Coefficient ◽  
Coefficient Of Friction ◽  
Room Temperature ◽  
Wear Behavior ◽  
Friction Pair ◽  
Wear Volume ◽  
Average Value ◽  
Small Impact ◽  
Test Conditions ◽  
The Coefficient Of Friction

In this paper, the effect of hardness and position on the 40CrNiMoA steel and 18Cr2Ni4WA steel friction pairs’ friction coefficient and wear volume were studied without lubrication, at room temperature. The results show that: Under test conditions, the fluctuation in the friction coefficient is bigger, when the up specimen is the harder 18Cr2Ni4WA steel. And when the up specimen is the softer 40CrNiMoA steel, the fluctuation in the friction coefficient is relatively small. When the up specimen is the 40CrNiMoA steel, the hardness of 40CrNiMoA steel is a relatively small impact on the average value of the coefficient of friction.When the up specimen is the softer 40CrNiMoA steel, the coefficient of friction is relatively larger than that when the up specimen is the harder 18Cr2Ni4WA steel. The wear volumes is relate to the position of friction pair. When the up specimen is the harder 18Cr2Ni4WA steel, both sides of the friction pairs has the same wear volumes when the hardness of 40CrNiMoA steel is about 43HRC. When the up specimen is softer 40CrNiMoA steel, and its hardness is about 54HRC, the wear volumes curves of two materials intersect.

Study of Friction and Wear Behavior of C/C Composite under Electrical Sliding

2015 ◽  
Vol 642 ◽  
pp. 19-23
Author(s):  
Shang Guan Bao ◽  
Yi Fan Wang ◽  
Zhen Hai Yang ◽  
Yong Zhen Zhang ◽  
Yue Chen ◽  
...  
Keyword(s):  
Wear Rate ◽  
Electric Current ◽  
Coefficient Of Friction ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Friction Couple ◽  
Wear Properties ◽  
Arc Erosion ◽  
Frictional Wear ◽  
The Coefficient Of Friction

Using C/C composite and chrome bronze as a friction couple, the frictional wear properties of C/C composite with electric current is studied in this paper. The results have shown that current, velocity and load are important factors to affect the frictional wear properties of C/C composite with electric current. Wear rate of C/C composite increases with the increase of arc energy .The coefficient of friction and the wear rate increase with the increase of velocity when the electric current is constant of 100A. The coefficient of friction increases but the wear rate decreases with the increase of load when the electric current is constant at 100A. The coefficient of friction decreases but the wear rate increases with the increase of current when the load is constant of 80N. Comparing with no electric current, the coefficient of friction of C/C composite with electric current decreases but the wear rate of that increases obviously. The wear mechanism of C/C composite is mainly of electric wear caused by arc erosion under the condition of current-carrying.

scholarly journals Dry Sliding Wear Behavior of Super Duplex Stainless Steel AISI 2507: a Statistical Approach

2016 ◽  
Vol 16 (4) ◽  
pp. 47-56 ◽  
Author(s):  
M. Davanageri ◽  
S. Narendranath ◽  
R. Kadoli
Keyword(s):  
Stainless Steel ◽  
Wear Rate ◽  
Duplex Stainless Steel ◽  
Wear Behavior ◽  
Desirability Function ◽  
Dry Sliding Wear ◽  
Super Duplex Stainless Steel ◽  
Heat Treated ◽  
Steel Aisi ◽  
Independent Parameters

Abstract The dry sliding wear behavior of heat-treated super duplex stainless steel AISI 2507 was examined by taking pin-on-disc type of wear-test rig. Independent parameters, namely applied load, sliding distance, and sliding speed, influence mainly the wear rate of super duplex stainless steel. The said material was heat treated to a temperature of 850°C for 1 hour followed by water quenching. The heat treatment was carried out to precipitate the secondary sigma phase formation. Experiments were conducted to study the influence of independent parameters set at three factor levels using the L27 orthogonal array of the Taguchi experimental design on the wear rate. Statistical significance of both individual and combined factor effects was determined for specific wear rate. Surface plots were drawn to explain the behavior of independent variables on the measured wear rate. Statistically, the models were validated using the analysis of variance test. Multiple non-linear regression equations were derived for wear rate expressed as non-linear functions of independent variables. Further, the prediction accuracy of the developed regression equation was tested with the actual experiments. The independent parameters responsible for the desired minimum wear rate were determined by using the desirability function approach. The worn-out surface characteristics obtained for the minimum wear rate was examined using the scanning electron microscope. The desired smooth surface was obtained for the determined optimal condition by desirability function approach.

EFFECTS OF HEAT TREATMENT ON TRIBOLOGICAL BEHAVIOR OF ELECTROLESS Ni–B COATING AT ELEVATED TEMPERATURES

2017 ◽  
Vol 24 (Supp01) ◽  
pp. 1850014 ◽  
Author(s):  
ARKADEB MUKHOPADHYAY ◽  
TAPAN KUMAR BARMAN ◽  
PRASANTA SAHOO
Keyword(s):  
Heat Treatment ◽  
Elevated Temperatures ◽  
Tribological Behavior ◽  
Wear Behavior ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heat Treated ◽  
Pin On Disc ◽  
Mixed Layers ◽  
Electroless Ni

The present work investigates the effects of heat treatment on friction and wear behavior of electroless Ni–B coatings at elevated temperatures. Coating is deposited on AISI 1040 steel specimens and subjected to heat treatments at 350[Formula: see text]C, 400[Formula: see text]C and 450[Formula: see text]C. Coating characterization is done using scanning electron microscope, energy dispersive X-Ray analysis and X-Ray diffraction analysis. Improvement in microhardness is observed for the heat treated deposits. Further, the effect of heat treatment on the tribological behavior of the coatings at room temperature, 100[Formula: see text]C, 300[Formula: see text]C and 500[Formula: see text]C are analyzed on a pin-on-disc setup. Heat treatment at 350[Formula: see text]C causes a significant improvement in the tribological behavior at elevated temperatures. Higher heat treatment temperatures cause deterioration in the wear resistance and coefficient of friction. The wear mechanism at 100[Formula: see text]C is observed to be predominantly adhesive along with abrasion. While at 300[Formula: see text]C, abrasive wear is seen to be the governing wear phenomenon. Formation of mechanically mixed layers is noticed at both the test temperatures of 100[Formula: see text]C and 300[Formula: see text]C for the coatings heat treated at 400[Formula: see text]C and 450[Formula: see text]C test temperature. The predominant wear mechanisms at 500[Formula: see text]C are abrasive and fatigue for as-deposited and heat treated coatings, respectively.

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