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Öğe Effect of different heat treatment conditions on microstructural and mechanical behaviour of AZ63 magnesium alloy(Taylor and Francis Ltd., 2015) Incesu, A.; Gungor, A.In this study, influence of different heat treatment conditions on microstructure, microhardness, yield strength, ultimate tensile strength, elongation and phase distribution of AZ63 magnesium alloy were discussed. All specimens were taken from as cast commercial AZ63 magnesium alloy. Solution heat treatment was applied at 400 °C for 16 h. After air cooling the specimens to room temperature, the specimens were aged at two different temperatures; 160, 190 °C and five different durations; 1, 3, 6, 9 and 12 h. The effects of heat treatment conditions on the mechanical and microstructural properties of AZ63 magnesium alloy were determined by tensile and microhardness tests, SEM, EDX and XRD analyses, respectively. It was observed that, after the solution treatment, a weak intermetallic phase of Mg 17 Al 12 was dissolved almost totally in the matrix. During ageing, this phase precipitated in the grains and also on the grain boundaries homogeneously depending on the ageing temperatures and times. © 2015, © 2015 Taylor & Francis.Öğe EFFECT OF LASER HARDENING ON THE MECHANICAL, TRIBOLOGICAL AND CORROSION PROPERTIES OF LOW ALLOY STEELS(Technical Faculty, Bor-Serbia, 2023) Albahlol, O. A. A.; Cug, H.; Akgul, Y.; Eticha, A. K.; Incesu, A.This research focuses on studying the mechanical, tribological, and corrosion behaviors of alloy steels: AISI 4340, AISI 5140, and AISI 8620 by laser hardening, respectively. In light of the tests which have been carried out meticulously, it is concluded that the optimum laser hardening parameter for all steel grades is 4 mm/s scanning speed and 1300 degrees C surface temperature. Micro-structural changes, Vickers hardness as mechanical properties, and tribological properties with reciprocating wear tests were carried out. Furthermore, corrosion tests were conducted. The test results reveal that the maximum hardness is achieved 50-300 mu m below the surface for all laser-hardened steels. Additionally, this study demonstrates that the wear resistance of steel is enhanced by the implementation of laser hardening. This study also determines that laser hardening has a positive impact on lifting the corrosion resistance behavior of AISI 4340 steel. In contrast, the corrosion resistance properties of AISI 8620 steel were reduced nearly by 54.17%.Öğe Effects of alloying elements and thermomechanical process on the mechanical and corrosion properties of biodegradable Mg alloys(Keai Publishing Ltd, 2021) Gungor, A.; Incesu, A.In this study, four different Mg-Zn-Ca-Mn alloys were produced using gravity die casting method. Mn content was kept constant in all alloys, while Zn and Ca were added in two different ratios. Homogenization heat treatment was applied to all cast alloys and a specimen from each homogenized alloy was hot rolled. Microstructure, mechanical properties, and corrosion behavior of the homogenized and hot rolled alloys were investigated as comparatively. Following results were obtained; grain size decreased significantly with increasing Zn content, Zn promoted Ca2Mg6Zn3 phase formation, corrosion resistance increased with increasing Zn/Ca atomic ratio, hot rolling resulted in much higher tensile strength but much lower ductility and toughness. Among the homogenized and hot rolled alloys, ZXM300-h alloy (hot rolled ZXM300 alloy) with its 146 +/- 2.5 MPa yield strength, 229 +/- 3.7 MPa tensile strength,% 1.6 +/- 0.1 elongation and 0.029 mm/yr immersion corrosion rate exhibited the best mechanical properties and corrosion resistance to be used as a biodegradable alloy such as fracture bone plate material. (C) 2020 Published by Elsevier B.V. on behalf of Chongqing University.Öğe Study Strength of Blind Riveted Lap Joint Structure under Tensile Shear Force(International Journal of Mechanical Engineering and Robotics Research, 2021) Qasim, B.M.; Khidir, T.C.; Incesu, A.In joint of sheets, blind rivet assembly is considered one of the most important and suitable ways to achieve a big amount of shear stresses in the structure without failure, blind rivets describe a hollow body contain a mandrel or stem, and when the rivet is set, mandrel pull and the body are deformed to clamp and hold the materials of the plates together securely. Blind rivets are easy to install, versatile, and unlike many fasteners, the failure of lap joints is most likely to occur as a result of shear failure of the rivets itself or bearing failure (crushing) of the plate, or tensile failure of the plates of structure, alone or in combination depending on the makeup of the joints. This investigation is concerned to study the influence of hole diameter, length of the rivet, the thickness of joint and using washer on the secondary head side of the generated shear stress, the mechanical behavior, particularly, ultimate tensile strength were investigated using a universal testing machine. The result shows that the maximum tensile force to increase when the hole diameter increase, changing the length of rivet influence on the strength of the structure the maximum tensile force increases with an increase the length of rivet, Furthermore, maximum shear force increase with decreasing the thickness of sheets and using the washer produces same results as increasing the maximum shear force before failure of the structure. Copyright © 2021 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.Öğe Wear performance investigation of AlSi8Cu3Fe aluminum alloy related to aging parameters(MIM RESEARCH GROUP, 2019) Baser, E.; Incesu, A.; Sismanoglu, S.; Gungor, A.Aluminum silicon alloys are the most preferred alloys for industrial applications due to their ease of production and lightness. It is important to improve the mechanical properties of these materials in order to increase their usage. Wear properties are one of these mechanical properties that can be improved. In this present investigation, 3 different artificial aging durations; 2hrs, 4 hrs, 8 hrs aging at 200 ?C were applied after solution heat treatment for 4 hrs. at 540 ?C to the AlSi8Cu3Fe alloy. Microstructural analysis, mechanical tests were applied to understand the effect of aging parameters on wear performance and also hardness values of AlSi8Cu3Fe alloy. According to the results obtained from tests and analyzes, the highest wear resistance was reached on the 4 hrs. aged sample. © 2019 MIM Research Group. All rights reserved.
