Kubilay Aslantas

Afyon Kocatepe University | AKU · Department of Mechanical Engineering

In this study, predictive modelling was performed for the cutting forces generated during the orthogonal turning of AISI 316L stainless steel. An artificial neural network (ANN) and a multiple regression analysis were utilised. The input parameters of the ANN model were the cutting speed, feed rate and coating type. In the model, tungsten carbide c...

In this study, the effects of different cutting conditions on the cutting performance were investigated in the micro milling of Inconel 718. In this context, dry cutting, minimum quantity lubrication and cryogenic pre-cooling were considered as the cutting conditions. Tool wear, surface roughness and burr formation were determined as performance cr...

In this study, the effects of deep cryogenic treatment (DCT) on the wear resistance of AISI 52100 bearing steel were investigated. For this purpose, a number of bearing steel samples were held for different times (12, 24, 36, 48, 60 h) at deep cryogenic temperatures (-145 �C). The wear experiments were carried out in a ball–disk arrangement, by app...

Surface roughness is an important parameter that determines the post-manufacturing product quality. In this study, effect of cutting parameters, coating material and the built-up edge phenomenon on the surface roughness were investigated in micro end milling process of Inconel 718 using a white light interferometer and scanning electron microscopy....

This comprehensive study investigates the micro-milling of a Mg13Sn alloy, a material of considerable interest in various high-precision applications, such as biomedical implants. The main objective of the study was to explore the optimizations of variable feed per tooth (fz), cutting speed (Vc), and depth of cut (ap) parameters on the key outcomes...

Aluminum Matrix Composite (AMC) represents an innovative class of materials that is extensively utilized in industries such as automotive, defense, aerospace, structural engineering, sports, and electronics. This study investigates the thrust force, exit burr formation, changes in the micro-tool, and drilled hole diameters during the micro-drilling...

Citation: Ercetin, A.; Özgün, Ö.; Aslantaş, K.; Der, O.; Yalçın, B.; Simşir, E.; Aamir, M. Microstructural and Mechanical Behavior Investigations of Nb-Reinforced Mg-Sn-Al-Zn-Mn Matrix Magnesium Composites. Metals 2023, 13, 1097. https://doi. Abstract: This research focuses on the fabrication and characterization of TAZ532-xNb composites, employing...

This study aims to determine the friction coefficient in the function of the sliding velocity between uncoated WC-Co tools and Ti-6Al-4V alloys processed by Laser Powder Bed Fusion (L-PBF) and the wrought one. A series of tribological tests combined with numerical simulations were performed under different sliding velocities and a constant contact...

Selective laser melting (SLM) is a three-dimensional (3D) printing process that can manufacture functional parts with complex geometries as an alternative to using traditional processes, such as machining wrought metal. If precision and a high surface finish are required, particularly for creating miniature channels or geometries smaller than 1 mm,...

Micro-thin-walled structures are frequently encountered in micro-pumps, micro-channel cooler plates, and micro-molds in the defense, aerospace and biomedical sectors. One of the micro-machining methods frequently used to obtain micro-thin-walled structures is micro-milling. The micro-milling method makes machining possible for micro-components with...

β-type Ti29Nb13Ta4.6Zr (TNTZ) alloy is a new-generation alloy that does not contain toxic/allergic elements. The alloys have low Young's modulus (⁓60 GPa) close to the cortical bone, providing excellent biocompatibility over familiar commercial CP Ti or Ti6Al4V ELI. Different macro/micro-machining methods can be used to obtain the final shape of Ti...

Different simulation methods can be used to model the response of structures to the effects of blast loading. While some simulation methods are based on empirical blast loading principles, other methods use a fluid structure interaction algorithm to predict post-explosion shock waves and their physical effects. In this study, CONWEP, SPH, ALE, and...

Bu çalışmada, ağırlıkça %5 Sn içeren Mg-Sn matris içerisine farklı oranlarda Al2O3 ilave edilerek toz metalurjisi (TM) yöntemiyle Mg5Sn-xAl2O3 kompozit malzemeler üretilmiştir. Üretimde Mg tozlarının sahip olduğu yüksek reaktivitenin yol açacağı olumsuzlukları önlemek amacıyla yeni bir karıştırma tekniği kullanılmıştır. Hazırlanan toz karışımlarınd...

The introduction of external surface features on mating contact surfaces is an effective method to reduce friction and wear between the contact surfaces. The tribological properties of the contact surfaces can be improved by controlling the geometrical parameters (shape, size, depth) of the surface texture effectively. In the present study, the tri...

Additive manufacturing technologies stand out compared to traditional manufacturing methods by allowing parts with complex geometries to be produced easily. However, due to insufficient surface qualities, the workpiece has to undergo a final surface finishing process. In this study, the differences in cutting forces, surface roughness and tool wear...

Today, carbon fiber reinforced plastic (CFRP) composites, which are the main areas of use such as aerospace and automotive, can be produced by different methods. Especially in the production of tubular composites, filament winding and roll wrapping methods are used generally, while vacuum-assisted resin transfer molding method or vacuum bagging met...

The main problem in machining of aluminum alloys is the adhesion of chips to the cutting tool. In micro milling, chip adhesion causes a decrease in surface quality and contributes to micro burr formation. There are several ways to minimize chip adhesion, one of which is to coat the tool with the appropriate material. Carbon-based coatings are coati...

In recent years, additive manufacturing (AM) of metallic parts opens new opportunities for many critical industrial sectors and individual necessities. The high quality and more functional components which are difficult or impossible to produce with the conventional methods can be readily manufactured using AM. In addition, minimization of design c...

Composites used in many fields today are produced by different methods and have different surface curvatures and geometries. Thus, these materials can exhibit different behaviors in terms of machinability characteristics as well as mechanical tests. Drilling operation is an inevitable process for assembly operations of many parts, and in some cases...

The demand for additive manufacturing (AM) technology is recently increased in the aerospace, biomedical, and automobile sectors due to the capability of producing complex components with zero tolerance. However, the small or precise part manufactured by AM process needs post-processing such as machining, polishing, etc. because of the poor surface...

Objective: The aim of this in vitro study was to evaluate the effect of thermal aging and five different discolouring solutions on the shear bond strength (SBS), discoloration, and slot surface roughness (SSR) of Flash-Free ceramic brackets. Methods: A total of 70 human premolar teeth were randomly divided into seven groups: group 1: no procedure w...

In this study, the fatigue crack propagation behavior of Ti-15V-3Al-3Sn-3Cr alloy, in which aging treatments were applied, was investigated under constant and variable amplitude loading. Single-step and duplex (pre-aging + second-step aging) aging have been conducted on the alloy at low and high temperatures. Duplex aging was applied with two diffe...

Microturning is a micromechanical machining process used to produce microcylindrical or axially symmetrical parts. Micro-cylindrical parts are mainly used in microfluidic systems, intravenous micromotors, microsurgical applications, optical lens applications, and microinjection systems. The workpiece diameter is very small in microturning and there...

In this study, the effects of cutting parameters in micro milling of Ti6Al4V material on surface quality and burr formation were experimentally investigated. Besides, feed per tooth, cutting speed and depth of cut were handled in different parameters. Hence, the surface roughness of the channels subjected to the micro milling process was measured a...

Bu çalışmada, kemik delme işleminde farklı takım geometrisinin, takım malzemesinin, farklı kesme koşullarının ve parametrelerinin kesme sıcaklığı üzerindeki etkisi deneysel olarak araştırılmıştır. Delme işlemi sırasında nekroza neden olan veya olabilecek olan tüm unsurlar belirlenmeye çalışılmıştır. Deneylerde 12 saat önce canlı olan sığırın femur...

Ti-15V-3Al-3Sn-3Cr alaşımına kriyojenik işlem ve kriyojenik işlem ardından tek basamaklı ve dubleks yaşlandırma işlemi uygulanarak, alaşımının mikro yapısal özellikleri, çekme özellikleri ve yorulma çatlak ilerlemesi davranışları incelenmiştir. Alaşıma -196°C’de 24 saat kriyojenik işlem uygulanmıştır. Dubleks ve tek basamaklı yaşlandırma işlemleri...

In this study, the effect of zinc addition on the microstructure and mechanical properties of magnesium five-tin (Mg5Sn) alloys was investigated. The powder metallurgy (P/M) method was used for the production of Mg5Sn-xZn (x = 0, 1, 2, 3, 4, and 5 weight percent) alloy after magnesium powders were coated with paraffin. The paraffin coating method w...

In this study, single and duplex aging treatment was applied to the metastable beta titanium alloy of titanium-15 vanadium-3 aluminum-3 chromium-3 tin with cryogenic treatment. The single-step aging treatment was applied for 20 h at 450°C and 10 h at 550°C. The cryogenic treatment was carried out at −196°C for 24 h, followed by single-step or duple...

Introduction: This study aimed to compare ProGlider (Dentsply Sirona, Ballaigues, Switzerland) and R-Pilot (VDW, Munich, Germany) instruments in terms of their cyclic fatigue resistance using an artificial stainless-steel canal showing abrupt apical curvature, torsional resistance according to the ISO specification, and topographic changes on inst...

In this study, the burr and slot widths formed after the micro-milling process of Inconel 718 alloy were investigated using a rapid and accurate image processing method. The measurements were obtained using a user-defined subroutine for image processing. To determine the accuracy of the developed imaging process technique, the automated measurement...

ÖZET: Mikro tornalama işlemi, talaş kaldırma prensibi olarak geleneksel tornalama işleminin mikro seviyede boyutlandırılmış halidir. Talaş kaldırma mekanizmasındaki boyut etkisinden dolayı kesme kuvvetlerinin birbirleri arasındaki oran değişmekte, titreşim oluşmakta ve minimum talaş kalınlığına bağlı negatif talaş açısı gözlenmektedir. Bu boyut etk...

Mikro tornalama işlemi, mikro silindirik parçaların imalatında kullanılan bir mikro işleme yöntemidir. Talaş derinliği ve ilerleme değeri çok küçük olması nedeniyle, iş parçasının tane boyutuna yakın değerlerinde kesme işlemleri yapılabilmektedir. Bu durumda, kesme kuvvetleri sadece iş parçasının türüne değil, aynı zamanda tane boyutuna, yüzeydeki...

Tüm dünyada, konvansiyonel hatlarda olduğu gibi yüksek hızlı demiryolu hatlarında da balastlı üstyapı yaygın olarak kullanılmaktadır. Bununla birlikte yüksek hızlı hatların gelişmesi ve trenlerin yük kapasitelerinin artması demiryolu üstyapısındaki balast ve taban zemini arasındaki granüler tabakalara daha farklı malzemelerden yapılmış alt tabakala...

In this study, the burr and slot widths formed after micro-milling process are investigated using a rapid and accurate image processing method. The measurements are obtained by processing the images and results were compared with a manual measurement method. In the cutting experiment stage, Inconel 718 alloy was chosen as the workpiece and cutting...

Objective: The aim of this study was to investigate temperature and time variations during rootend resection. Material and methods: Sixty human premolars were selected. The root canals were enlarged up to ProTaper X3 rotary instrument. A thermocouple was placed into the root canal 1 mm behind the resection line. The teeth were randomly divided into...

The aim of this study was to evaluate the roughness of the apical surface after apical resection performed by six different methods with an optical profilometer. Sixty human single root premolar teeth were used in this in vitro study. After root canal preparation, root canals were filled with gutta‐percha and AH Plus root canal sealers by lateral c...

In this study, the effects of various heat treatment procedures on the mechanical properties of the Ti-15V-3Al-3Sn-3Cr metastable β titanium alloy were investigated. Single-step and duplex aging treatments were applied to the alloy at low and high aging temperatures. Duplex aging treatments were carried out by selecting two different pre-aging time...

In this study, the effect of tool geometry on the cutting forces, surface roughness, and burr formation in the micro-milling process is investigated. Three different geometric parameters (helix angle, number of cutting edges, and axial rake angle) that may affect the machining performance are taken into account. Inconel 718 superalloy was used as w...

Metastable b titanium alloys are widely used in the biomedical, automotive, and aerospace industry, due to their excellent corrosion resistance, fatigue strength, biocompatibility, and easy formability. Besides all these use areas, the suitable microstructure of the alloys for heat treatment increases the efficient usability day by day. In literatu...

Al2O3 coatings serve as a thermal barrier during a cutting operation and lead to a different chip formation due to changes in heat sharing and friction conditions, thus affect tool life substantially. In this study, the effects of Al2O3 coating on chip formation were investigated in orthogonal cutting of AISI 316L stainless steel. For this purpose,...

In this study, Ti-15V-3Al-3Cr-3Sn metastable beta titanium alloy was subjected to with and without cryogenic treatment followed by single-step as well as duplex ageing treatment. The single-step ageing treatment was applied for 20 hours at 450°C and 10 hours at 550°C. The cryogenic treatment was carried out at -196°C for 24 hours, followed by singl...

Micro-turning is a micro-mechanical cutting method used to produce small diameter cylindrical parts. Since the diameter of the part is usually small, it may be a little difficult to improve the surface quality by a second operation, such as grinding. Therefore, it is important to obtain a good surface finish in the micro turning process using the i...

Micro-milling is a micro-mechanical cutting method used to obtain complex and three-dimensional micro geometries. Micro-cutting tools are used in the manufacturing of micro-components and the type of workpiece is also important for good surface quality and minimum burr. In this study, micro machinability of Ti6Al4V alloy which is used most frequent...

In this study, micro machinability of Mg5Sn4Zn (TZ54) alloy produced by a hot-pressing process (one of the powder metallurgy methods) is investigated. For this purpose, micro-milling experiments were carried out, considering different cutting parameters. In order to determine the appropriate cutting parameters, the variation of cutting forces, surf...

In this study, Mg Sn alloys were produced through the powder metallurgy (P/M) method by adding Sn in different ratios into Mg powder. A new mixing technique has been used in production to prevent the disadvantages of high reactivity that the Mg powders have. The prepared powder mixtures were turned into components by processing through hot pressing...

In the present study, Mg5Sn–xZn (x = 0, 1, 2, 3, 4, and 5 wt%) alloys in superior biocorrosion properties were produced successfully. A novel mixing technique which prevents contact of magnesium with oxygen has been applied in order to produce Mg–Sn–Zn alloys by hot pressing. According to the obtained results, it was observed that a homogeneous mic...

The scope of this study is the investigation of the effect of microstructure on fatigue behavior of Ti-15V-3Al-3Sn-3Cr (Ti 15–3) metastable beta titanium alloy. Aging treatment was applied to Ti 15–3 alloy at low and high aging temperatures. The fatigue crack initiation and propagation behavior of the alloy was determined by applying fatigue crack...

Hybrid composites are the material group largely preferred for use in space, aerospace and ballistic applications, where superior mechanical strength and low density are required. Hybrid composites are produced using high strength Kevlar and S-glass fiber as reinforcement material. Three different nano-particle, nano-clay, nano-calcite and nano-car...

Magnezyum (Mg) alaşımları, düşük yoğunlukları ve özgül dayanımları ile havacılık, uzay ve otomotiv endüstrisinde, elektronik/haberleşme, biyomalzeme ve spor ekipmanlarının imalatında kullanılmakta ve dökümden sonra özellikle medikal ve elektronik uygulamalarda mikro/makro işlemeye ihtiyaç duyulduğu, mikro işlenebilirliklerinin araştırmalara konu ol...

Micro turning is a micro machining method used in the manufacture of micro cylindrical parts. Because of the depth of cut and the feed rate is very small, cutting operations can be made at the values close to the grain size of the workpiece. In this case, the cutting forces vary not only according to the type of workpiece, but also according to gra...

In this study, tribological, corrosion, non-wettability and surface energy properties of were coated with TiO2 and ZrO2 by sol gel method. Ti6Al4V, W80-Cu20 processed in 15x5 mm dimensions were polished in 1 μm Al2O3 solution after required sanding operations before the left gel treatment. The wear tests were carried out in a ball-disc arrangement...

In this study, the effect of notch orientation and a single overload on the fatigue crack propagation behavior of Ti–6Al–4V alloy was investigated. The notches were formed in two different forms: symmetrical and asymmetrical. Two types of fatigue crack propagation tests were applied to the specimens, with constant amplitude and overload. It was det...

This study presents finite element simulations of cutting force, torque, and temperature in drilling of Inconel 718 superalloy. The FEM simulations were conducted at a cutting speed of 15 m/min and feed of 0.02 mm/rev using an uncoated solid carbide drill. The predicted cutting forces, torques and cutting temperatures were validated with the experi...

Bu çalışmada, Inconel alaşımı sol-jel mettodu kullanılarak borlanmıştır. Borlama sonrası numuneler elektrik rezistanslı fırında 900○C'de 1 saat bekeltilerek sinterlemiştir. Numuneler kesitten kesilerek gerekli metolografik işlemlerden geçilirek numunelerin borür tabaka kalınlıkları Nikon MA100 marka optik mikroskop yardımıyla ölçülmüştür. Borlanmış...

Each passing day, materials are produced with different compositions by the method of powder metallurgy. The machinability of the produced materials is as important as the mechanical and chemical properties. In aforesaid article, cutting force variations, tool wear, surface roughness and burr formation during the micro milling of W-Cu alloys in dif...

Each passing day, materials are produced with different compositions by the method of powder metallurgy. The machinability of the produced materials is as important as the mechanical and chemical properties. In aforesaid article, cutting force variations, tool wear, surface roughness and burr formation during the micro milling of W-Cu alloys in dif...

İmalat sanayinde gelişen teknoloji ve yüksek hassasiyette parça gereksinimi, mikro işlemeyi ortaya çıkarmıştır. Mikro mekanik işleme yöntemi ile hem yüksek hızda hem de yüksek hassasiyette iş parçaları üretmek mümkündür. Bir nümerik modelleme tekniği olan sonlu elemanlar metodu, deneysel olarak tespit etmenin zor olduğu verilerin (gerilme, şekil de...

Mikro tornalama işlemi, geleneksel tornalama işlemine çok benzemekle beraber, takım geometri etkisinin daha ön plana çıktığı bir kesme işlemidir. Bu nedenle mikro tornalama işleminde kullanılan kesici geometrisinin ve kesme parametrelerinin özenle seçilmesi gerekmektedir. Bu çalışmada, Ti6Al4V alaşımının mikro şartlarda işlenmesi sırasında, takıma...

In this study, a number of turning operations were performed in micro conditions at very high cutting speeds (up to 1400 m/min). At a wide range of depth of cut and feed values, the variations in cutting forces and surface quality were investigated. Also considering nose radius and edge radius of the cutting tool, the minimum depth of cut and feed...

The wastes and emissions from machining processes have negative effects on the environment and human health. Therefore, the use of environmentally friendly cooling or lubrication systems has increased recently. Ethanol is an ideal coolant for high-speed machining because it has lower viscosity than those of oil-based coolants. Ethanol’s low evapora...

Shape memory alloys (SMA) are widely used in the biomedical field due to their unique properties. Among these alloys, NiTi alloys are the most widely used. Machining process is one of the techniques to form these materials. If the NiTi alloys are mechanically forced to be cut, the crystal lattice structure can change and thus phase transformation c...

Ti-5553 alloy is considered as a next generation aerospace alloy, however, it is also considered as difficult-to-machine material due to its thermal and mechanical properties. As limited research work presented in literature on machining process of this alloy, more research is needed to determine appropriate machining strategies for this alloy. Thu...

In this study, the effects of the cutting parameters on the surface quality and burr width were investigated in the micro milling of Ti-6Al-4V alloy. Spindle speed, feed per tooth and depth of cut are selected as the control factors. Taguchi-based gray relational analysis was used in the optimization of the cutting parameters for minimal burr width...

Bu çalışmada, mikro frezeleme işleminde takımda meydana gelen aşınmanın kanal geometrisi üzerinde etkisi deneysel olarak araştırılmıştır. Deneylerde, iş parçası olarak Inconel 718 alaşımı tercih edilmiş olup, sabit kesme parametreleri dikkate alınmıştır. Deneyler kuru kesme şartlarında yapılmış olup, ardışık kesme işlemleriyle mikro kanallardaki bo...