Effect of heat treatment and electric discharge alloying on the tribological performance of Selective Laser Melted AlSi10Mg

2021 ◽  
pp. 1-21
Author(s):  
Thasleem Payaningal ◽  
Basil Kuriachen ◽  
Deepak Kumar ◽  
Afzaal Ahmed ◽  
Joy ML
Keyword(s):  
Heat Treatment ◽  
Elevated Temperature ◽  
Wear Rate ◽  
Electric Discharge ◽  
Elevated Temperatures ◽  
Wear Behavior ◽  
Cast Specimen ◽  
En 31 ◽  
Pin On Disk ◽  
Oxidation Wear

Abstract Selective Laser Melting (SLM) is an emerging additive manufacturing technology for fabrication of complex light-weight components along with improved mechanical properties. The present work investigates influence of various post processing methods such as Heat Treatment and Electric Discharge Alloying (EDA) on ambient and elevated temperature wear behavior of Selective Laser Melted (SLM) AlSi10Mg alloy and compared with its tribological behavior with cast AlSi10Mg. The dry wear tests were conducted using a Pin On Disk (POD) tribometer with EN-31 as counter body. The EDA treated SLM AlSi10Mg showed the least wear rate and coefficient of friction (COF) at both ambient and elevated temperatures (1.05 × 10−4 mm31/Nm and 0.434 & 3.12 × 10−5 mm3/Nm and 0.531 respectively) due to its higher hardness (189.8 HV) as compared to other samples. The wear rate and COF of cast specimen are found to be highest among all specimens at both ambient and elevated temperatures (1.34 × 10−4 mm3/Nm and 0.528 and 4.49 × 10−5 mm3/Nm and 0.724 respectively). Lower wear rate and higher COF are observed at elevated temperature due to the excessive formation of wear-resistant oxides (Al2O3, SiO2 and MgO) and glaze layers for all samples compared to ambient temperature wear behaviors of its counter parts. Abrasive wear, adhesive wear, oxidation wear and surface delamination are the prominent wear mechanisms observed for ambient and elevated temperatures for all the specimens.

Investigation of the Wear Behavior of AA6082 Against Different Counterparts

2021 ◽  
Author(s):  
Safiye İpek Ayvaz ◽  
Mehmet Ayvaz
Keyword(s):  
Wear Resistance ◽  
Aluminum Alloy ◽  
Wear Rate ◽  
Abrasive Wear ◽  
Wear Behavior ◽  
Specific Wear Rate ◽  
Pin On Disk ◽  
Disk Method ◽  
Sliding Distance ◽  
Oxidation Wear

In this study, the effect of different counterparts on the wear resistance of AA6082 aluminum alloy was investigated. In tests using pin-on-disk method, 6 mm diameter Al2O3, 100Cr6 and WC-6Co balls were used as counterparts. The tests were carried out using 500 m sliding distance and 5N load. The lowest specific wear rate was measured as 7.58x10-4 mm3/Nm in WC-6Co / AA6082 couple, and the highest value was measured as 9.71x10-4 mm3/Nm in 100Cr6/AA6082 couple. In the Al2O3/AA6082 couple, the specific wear rate of the AA6082-T6 sample was determined as 8.23x10-4 mm3/Nm.While it was observed that the dominant wear type in the 100Cr6/AA6082 pair was abrasive wear, oxidation wear and oxide tribofilm were detected in the WC-6Co/AA6082 and Al2O3/AA6082 couple besides the abrasive wear.

Tribological Property Investigation of Self-Lubricating Molybdenum-Based Zirconia Ceramic Composite Operational at Elevated Temperature

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Kunal Ghosh ◽  
Subhrojyoti Mazumder ◽  
Bipin Kumar Singh ◽  
Harish Hirani ◽  
Poulomi Roy ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Wear Rate ◽  
Photoelectron Spectroscopy ◽  
Ceramic Composite ◽  
Wear Behavior ◽  
Substantial Reduction ◽  
Tetragonal Zirconia ◽  
Zirconia Ceramic ◽  
Sintering Process ◽  
Wear Debris Analysis

Abstract Three mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) with 0.5 wt% of magnesium oxide (MgO) and 6 wt% of molybdenum (Mo) were prepared by the pressureless sintering process, and the friction and wear behavior of the ceramic composite were studied against the alumina disc. Tribological tests were carried out both at room temperature as well as at an elevated temperature (500 °C). The result revealed that a substantial reduction of ∼50% in the friction coefficient and ∼31% reduction in the wear rate were achieved while 6 wt% Mo was added into the 3Y-TZP matrix operational at 500 °C. No significant tribological influence was observed with the addition of Mo at the normal operating temperature. The minimum coefficient of friction and low specific wear rate were achieved because of the formation of MoO3 in between the mating surfaces at elevated temperature. The worn surfaces were characterized by means of field emission scanning electron microscopy (FESEM). The formation of MoO3 phases was identified by wear debris analysis which was performed with the help of X-ray photoelectron spectroscopy (XPS).

Wear Behavior of White Layer in Plasma Nitrided H13 Steel at Ambient and Elevated Temperatures

2009 ◽  
Vol 83-86 ◽  
pp. 41-48 ◽  
Author(s):  
Amir Mahmoudi ◽  
Mohamad Esmailian
Keyword(s):  
Wear Resistance ◽  
Elevated Temperature ◽  
Single Phase ◽  
Elevated Temperatures ◽  
Wear Behavior ◽  
White Layer ◽  
H13 Steel ◽  
Aisi H13 Steel ◽  
Pin On Disc ◽  
Aisi H13

In this study, AISI H13 steel was plasma nitrided in two different atmospheres, containing 25%N2-75%H2 and 4%N2-96%H2 at a constant temperature of 530oC and 6h-holding time. Dry wear behavior of nitrided samples was determined with pin-on-disc method at 25oC and 500oC, under 10N and 30N loads. The results indicated that the nitrided steels, which had a thin multiple phases white layer (produced at 4%N2-96%H2 atmosphere), didn’t have any wear resistance in ambient and elevated temperatures. However, the nitrided steels, having thick single phase white layer (produced at 25%N2-75%H2 atmosphere), showed better wear resistance in ambient temperature than in elevated temperature.

Mathematical Model to Evaluate Wear Rate of Graphite as Sealing Materials

2013 ◽  
Vol 871 ◽  
pp. 200-205 ◽  
Author(s):  
Yeon Wook Kim ◽  
Jae Hoon Kim ◽  
Bo Hwi Seo ◽  
Hoon Seok Choi ◽  
Sung Han Park ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Wear Rate ◽  
Applied Load ◽  
Elevated Temperatures ◽  
Wear Behavior ◽  
Sem Analysis ◽  
Specific Wear Rate ◽  
Dry Sliding Wear ◽  
Sliding Speed ◽  
Sealing Material

The dry sliding wear behavior of graphite (HK-6) that is used as the sealing material to cut off hot gas was evaluated as a function of applied load, sliding speed and temperature. The reciprocating wear tests were carried out at room temperature and elevated temperatures. An attempt has been made to develop a mathematical model by response surface methodology (RSM) and an analysis of variance (ANOVA) technique was applied to confirm the validity of the developed model. Also, the effect of applied load, sliding speed and temperature on wear the behavior of graphite was investigated. The wear mechanism was compared through the observation of the worn surface by SEM analysis. The specific wear rate was dependent on the interaction between temperature, applied load and sliding speed. A developed model can be used to effectively predict the specific wear rate of graphite as a sealing material within the range of variables studied.

Wear Behavior of Flat and Graded Profile Boron-Implanted Beryllium

1983 ◽  
Vol 27 ◽  
Author(s):  
K. Kumar ◽  
H. Newborn ◽  
R. Kant
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Electron Spectroscopy ◽  
Auger Electron ◽  
Friction And Wear ◽  
Boron Concentration ◽  
Wear Behavior ◽  
Friction And Wear Behavior ◽  
Flat Profile ◽  
Pin On Disk

ABSTRACTPin-on-disk tests were performed for comparative friction and wear behavior on flat and graded profile boron implanted beryllium samples. Peak, intended boron concentrations of 10, 20, 30 and 40 atom percent were investigated. Auger Electron Spectroscopy was used to determine the boron concentration as a function of depth. Preliminary work was performed to study the effects of (1) a low temperature (450°C, 1–1/2 hours) heat treatment of the implanted specimens and (2) a change in the pin material. All of the boron implanted beryllium samples showed significant improvement versus unimplanted beryllium and an anodized beryllium surface. Graded samples showed comparable friction coefficients but inferior wear resistance with respect to the flat profile samples.

Sliding Behavior of Alumina/Nickel and Alumina/Nickel Aluminide Couples at Room and Elevated Temperature

1988 ◽  
Vol 110 (4) ◽  
pp. 646-652 ◽  
Author(s):  
Peter J. Blau ◽  
Charles E. DeVore
Keyword(s):  
Elevated Temperature ◽  
Friction Coefficient ◽  
Nickel Aluminide ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Sliding Friction ◽  
Surface Damage ◽  
Polycrystalline Alumina ◽  
Ordered Intermetallic ◽  
Pin On Disk

Nickel aluminide alloys are ordered intermetallic compounds which show promise for elevated temperature applications, some of which involve sliding contact. The present investigation was conducted to develop an initial understanding of the unlubricated sliding behavior of a nickel aluminide alloy at room and elevated temperatures. In particular, the variations in the friction coefficient and the wear track morphology during the break-in stage and subsequent transitions were studied. Pin-on-disk experiments were conducted at room temperature and at 650° C (923° K) in air using fixed 9.5 mm diameter polycrystalline alumina balls as the pin material. To provide a comparison in behavior, nickel (Ni-200) disks were tested under the same conditions. The sliding friction coefficient of alumina on nickel aluminide was considerably higher than that for alumina on nickel at room temperature, but it was only slightly higher at 650° C. The wear was similar for both materials at room temperature, but the nickel aluminide exhibited relatively mild wear at 650° C, displaying less severe surface damage than the nickel. Work on identifying key friction and wear mechanisms and on evaluating the temperature limitations for future applications will continue.

Effect of Repeated Quenching Heat Treatment on Microstructure and Dry Sliding Wear Behavior of Low Carbon PM Steel

2007 ◽  
Vol 534-536 ◽  
pp. 673-676 ◽  
Author(s):  
Ahmet Güral ◽  
Süleyman Tekeli ◽  
Dursun Özyürek ◽  
Metin Gürü
Keyword(s):  
Heat Treatment ◽  
Sliding Wear ◽  
Volume Fraction ◽  
Wear Behavior ◽  
Constant Load ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Low Carbon ◽  
Ar Gas ◽  
Pin On Disk

The effect of repeated quenching heat treatment on microstructure and dry sliding wear behavior of low carbon PM steel was investigated. For this purpose, atomized iron powder was mixed with 0.3 % graphite and 1 % Ni powders. The mixed powders were cold pressed and sintered at 1200°C for 30 min under pure Ar gas atmosphere. Some of the sintered specimens were intercritically annealed at 760°C and quenched in water (single quenching). The other sintered specimens were first fully austenized at 890°C and water quenched. These specimens were then intercritically annealed at 760°C and re-quenched in water. The martensite volume fraction in the double quenched specimens was higher than that of the single quenched specimen. Wear tests were carried out on the single and double quenched specimens under dry sliding wear condition using a pin-on-disk type machine at constant load and speed. The experimental results showed that the wear coefficient effectively decreased in the double quenched specimen.

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>

Wear performance of Al-TiC composite at elevated temperature

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Eshan Agrawal ◽  
Vinod Tungikar
Keyword(s):  
Elevated Temperature ◽  
Wear Rate ◽  
Coefficient Of Friction ◽  
Elevated Temperatures ◽  
Centrifugal Casting ◽  
Wear Test ◽  
Heating Chamber ◽  
Wear Performance ◽  
Content Type ◽  
Pin On Disc

Purpose Aluminium matrix composites are subjected to wear as well as higher temperature applications such as pistons, cylinder heads and blocks for car engines. Therefore, it is important to evaluate the performance of aluminium metal matrix composite at elevated temperature. Design/methodology/approach In the present work wear performance of Al-TiC composite with 7.5% reinforcement of TiC powder is carried out at elevated temperature. The composite specimens are prepared with the help of centrifugal casting method to get the large segregation of reinforcement on the outer layer of the composite which is subjected to wear. Taguchi method is used for preparing design of experiments. Findings The wear test is performed on DUCOM pin on disc setup having the heating chamber facility. The results of wear test are analysed with the help of MINITAB 19 software. The results show that temperature has dominant effect on the wear rate. The mathematical model through regression is predicted for wear rate and coefficient of friction. The study of worn-out surface is performed with the help of scanning electron microscope. The micrographs show that the type of wear is changes from abrasive to severe wear and some delamination. Originality/value The experiments are conducted as per ASTM standards. The results give the mathematical equation for wear rate and coefficient of friction at elevated temperatures.

scholarly journals Masking Effect of LPSO Structure Phase on Wear Transition in Mg97Zn1Y2 Alloy

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1857
Author(s):  
Fujun Tao ◽  
Hongfei Duan ◽  
Lijun Zhao ◽  
Jian An
Keyword(s):  
Wear Rate ◽  
Elevated Temperatures ◽  
Wear Behavior ◽  
Testing Machine ◽  
Masking Effect ◽  
Enhancement Effect ◽  
Severe Wear ◽  
Lpso Structure ◽  
Structure Phase ◽  
Wear Transition

Room- and elevated-temperature wear tests were conducted using a pin-on-disk testing machine to study wear behavior of Mg97Zn1Y2 alloy and role of long-period-stacking-ordered (LPSO) structure phase in mild–severe wear transition (SWT). Variation of wear rate exhibited a three-stage characteristic with load at various test temperatures, i.e., a gradual increasing stage, a slightly higher plateau stage, and a rapid rising stage. The wear mechanisms in the three stages were identified using scanning electron microscope (SEM), from which the first stage was confirmed as mild wear, and the other two stages were verified as severe wear. The interdendritic LPSO structure phase was elongated into strips along the sliding direction with Mg matrix deformation in the subsurface, plate-like LPSO structure phase precipitated at elevated temperatures of 150 and 200 °C. The fiber enhancement effect and precipitation effect of LPSO structure phase resulted in a little difference in wear rate between the first and second stages, i.e., a masking effect on SWT. Microstructure and microhardness were examined in the subsurfaces, from which the mechanism for SWT was confirmed to be dynamic recrystallization (DRX) softening. There is an apparently linear correlation between the critical load for SWT and test temperature, indicating that SWT is governed by a common critical DRX temperature.

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