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1
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The Effects of Austempering and Induction Hardening on the Wear Properties of Camshaft Made of Ductile Cast Iron

100%
Karaca B., Şımşır M.
Acta Physica Polonica A
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2017
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vol. 131
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issue 3
448-452
EN
The aim of this study is to investigate the effects of heat austempering and induction hardening on the wear properties of GGG60 ductile cast iron for camshaft production. For this purpose, camshafts have been produced by sand mould casting method. Fe-Si-Mg alloy has been used for inoculation process to achieve iron nodulization. The casting has been done between 1410-1420°C. The casted camshafts have been austenitized at two different temperatures (800 and 900°C) and time intervals (60 and 90 min) under controlled furnace atmosphere. The austenitized camshafts have been quenched into the molten salt bath at 360°C, held there for 90 min and then cooled in air. This way, austempering heat treatment has been applied. After that, surface hardening process was conducted using induction hardening machine with medium frequency. Microstructure of camshafts has been examined by optical methods and mechanical tests have been performed. Results show that austempering heat treatment increases the wear resistance of camshaft, compared to as-cast condition. Wear resistance of the camshaft increases with increasing austenitizing temperature, time and with induction hardening. The lowest weight loss of 0.62 mg has been obtained for the induction hardened camshaft austenitized at 900°C for 90 min.
2
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Wear Properties of Gabbro Based Glass and Glass-Ceramic Materials

80%
Bayrak G.
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vol. 125
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issue 2
615-617
EN
Glass-ceramic materials were developed from gabbro including MgO and Al_2O_3 additives. Heat treatments for phase transformation from glassy matrix to glass-ceramic were carried out at 1000C for 3 h. X-ray diffraction studies conducted on the glass-ceramic samples revealed that the phases formed in the glass-ceramics were cordierite, anorthite, diopsitic augite, forsterite and andesine. Glass and glass-ceramic materials were tested for wear properties against a harder alumina counterface using by a ball-on-disc tribometer at dry sliding condition. Wear tests were realized under the loads of 2.5, 5, and 7.5 N and at the sliding speeds of 0.1, 0.2, and 0.3 m/s. Wear rate of the glass and glass-ceramics ranged from 7.324 × 10^{-7} and 2.150 × 10^{-3}-9.971 × 10^{-7} and 4.982 × 10^{-5} mm^3/m, respectively. It was shown that the crystallization treatment caused the decrease of wear rate.
3
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Microstructure and Hardness Characteristics of Al₂O₃-B₄C Particle-Reinforced Cu Matrix Composites

80%
Öksüz K., Şahin Y.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
650-652
EN
Copper is widely used in industrial applications because of its high electrical and thermal conductivity, easiness of processing and good corrosion resistance. However, copper also has some distinct limitations such as low hardness, low tensile yield strength and poor creep resistance. In this report copper matrix was reinforced with ceramics like Al₂O₃ and B₄C particles using powder metallurgy (PM) method and its microstructure was examined with SEM and EDS. The microstructure has revealed an uniform distribution of particles in the matrix and a good interface bonding between B₄C particles and the matrix. However the dispersion of Al₂O₃ particles, of larger sizes, has led to some porosity and inter-particle contacts in the composites. Therefore, hardness of B₄C particle-reinforced composites is significantly higher than that of Al₂O₃ particle-reinforced composites.
4
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Wear Behavior of TiAlN and CrAlN Coatings Deposited by TRD Process on AISI D2 Steel

80%
Kılınc B., Cegil O., Sen S., Sen U.
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vol. 125
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issue 2
362-364
EN
The wear properties of uncoated, chromium aluminum nitride (CrAlN) and titanium aluminum nitride (TiAlN) coated AISI D2 steel were investigated and compared using ball-on-disc method at 0.3 m/s sliding speed and under the loads of 2.5 N, 5 N, and 10 N against Si_3N_4 ball as a counter material. Steel samples were nitrided at 575C for 8 h in the first step of the coating process, and then titanium aluminum nitride coating and chromium aluminum nitride were performed by thermoreactive deposition (TRD) process at 1000C for 2 h. Coated samples were characterized by X-ray diffraction analysis, scanning electron microscopy, microhardness, and ball on disk wear tests. The results of friction coefficient and wear rate of the tested materials showed that the TiAlN coating presents the lowest results.
5
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Treatment Techniques on Aluminum to Modify the Surface Wetting Properties

80%
Torrisi L., Scolaro C.
Acta Physica Polonica A
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2015
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vol. 128
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issue 1
48-53
EN
Different techniques of surface treatment are employed to modify the physical properties of aluminum surfaces. Experimental data report measurements of water wetting ability in aluminum surfaces treated with six different techniques: polishing, sanding, acid attach, laser ablation, ion implantation and nanoparticle deposition. Surfaces can be modified as a function of the different treatment parameters. Treatment duration, roughness and morphology play an important role in determining the properties from hydrophobic to hydrophilic behavior.
6
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The Effect of Perlite Addition on Erosive Wear Behavior of Alumina Ceramics

70%
Tas S., Ercenk E., Yilmaz S.
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vol. 125
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issue 2
632-634
EN
In this study, the effects of perlite addition on mechanical properties and wear resistance of alumina ceramics were investigated. Alumina powders including perlite 5%, 10%, 15%, 20% and perlite free were prepared. These powders were shaped as rectangular by using uniaxial pressing system under the load of 100 MPa. The samples were sintered at 1400°C-1550C for 2 h and were subjected to some mechanical tests such as hardness and fracture toughness. X-ray diffraction analysis was employed to determine the crystalline phases. Bulk densities of the samples were measured. In addition, erosive wear test was performed to investigate the erosive wear resistance of the samples. The wear test results were presented depending on different sliding speed and sintering temperature. These results showed that perlite addition has a positive effect on erosive wear resistance of the alumina ceramics, generally.
7
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Modelling of Spin-Dependent Mechanical Friction at Atomic Level

61%
Gzik-Szumiata M., Szumiata T., Morozow D.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
713-715
EN
In this work a simple 2D model of pseudostatic friction at atomic level has been prepared, in the frame of which both Lennard-Jones potential and spin-dependent term of exchange interaction has been included. As an example, it has been demonstrated, that for iron both average lateral and normal forces between atoms of "base" and "slider" in the tribological node are altered through the change of relative direction of spins, by over a dozen of percent, when the interatomic distance is comparable to the lattice constant. Spin-dependent correction of atomic-level friction coefficient has been estimated.
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