Ferhat Gül- Faculty Member at Gazi University
Ferhat Gül
- Faculty Member at Gazi University
About
59
Publications
15,278
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
250
Citations
Introduction
Current institution
Publications
Publications (59)
Küresel grafitli dökme demir, birçok mühendislik malzemelerine kıyasla üstün mekanik özelliklere sahip bulunmaktadır. Küresel grafitli dökme demirin östemperleme ısıl işlemi, çekme dayanımı, sertlik, darbe dayanımı gibi birçok özelliğinde artış sağlamaktadır. Bu çalışmada östemperlenmiş küresel grafitli dökme demirin darbe dayanımına, bilyalı dövme...
Bu çalışmada, kriyojenik işlem uygulanmış olan DIN 1.2379 soğuk iş takım çeliğinin, abrasif aşınma direnci araştırılmıştır. Bu amaçla herhangi bir işlem uygulanmamış ve farklı kriyojenik ısıl işlem uygulanmış 6x50 mm ebatlarındaki deney numuneleri hazırlanmıştır. 1030 ͦ C’de 1 saat östenitlenmiş olan numunelere yağda su verilmiştir. Kriyojenik işl...
Austempered ductile iron (ADI) was investigated. Unalloyed ductile iron was austenised at 850˚C for 30, 60 and 90 min and austempered at 400 ˚C for 60 and 120 min. The austempered ductile cast iron (ADI) specimens were abraded on the pin on disc apparatus under the normal load of 40 N and at the sliding speed of 0.1 m s-1 by rubbing the specimens a...
Çeliklerin şekillendirilebilirliği bakımından süneklik, istenen bir malzeme özelliğidir. Sanayide sıkça kullanılan bir işlem olan klasik su verme-temperleme ısıl işlemi ile istenilen sünekliğin elde edilmesi mümkündür. Fakat sünekliğin artmasıyla çeliğin sertliğinin azalması istenmeyen bir etkendir. Yenilikçi su verme-ayrıştırma ısıl işlemi ile sün...
Carbon nanotubes are expensively attracting scientific and technological interest by means of their important advantages on materials. Some researches have shown that carbon nanotubes possess remarkable mechanical properties like exceptionally high elastic modulus and large elastic strain etc. Electroless coating is one of the most important method...
One of the most important physical properties in metal and its alloys, metal matrix composites and materials science and technology are the density and porosity content. These two concepts have a significant effect on the microstructure and hence the mechanical properties of the materials produced. The aim of this course is to provide advanced engi...
Wear characteristics of composites, Al matrix reinforced with B4C particles percentages of 5, 10,15 and 20 produced by the powder metallurgy method were studied in this study. For this purpose, a mixture of Al and B4C powders were pressed under 650 MPa pressure and then sintered at 635 °C. The analysis of hardness, density and microstructure was pe...
In this study, abrasive and adhesive wear behaviors of fused silica particle reinforced Al10Si composites produced by vacuum infiltration method was investigated. Abrasive wear tests were carried out under the normal loads of 10, 20 and 30 N, 0.2 m/s sliding speed against to 60, 100, 220, 400, 500, 800, 1000 and 1200 grades abrasive Al2O3 papers us...
SEMI SOLID METAL CASTING PROCESS TECHNOLOGY FOR
MANUFACTURING OF AUTOMOTIVE COMPONENTS
ABSTRACT
In this study, effect of Si or Pb minor alloying additions to AZ91 alloy on their abrasive behaviors has been investigated. Pin-on-disk type equipment has been used for the abrasive wear testing. Abrasive wear tests performed on 200 and 400 mesh Al2O3 abrasive papers under 10, 20, 30N loads for 10 m with a 0,2 m/s sliding velocity. It was...
In this study, the effects of reinforcement volume fractions on abrasive wear behavior were examined in Al-MgO reinforced metal matrix composites of 5%, 10% and 15% reinforcement - volume ratios produced by melt-stirring. Abrasive wear tests were carried out by 60, 80 and 100 mesh sized Al2O3 abrasive papers and pin-on-disc wear test apparatus unde...
Bu çalışmada, TiN kaplanmış östemperlenmiş küresel grafitli dökme demirlerin aşınma davranışı üzerinde pim sıcaklığının etkisi incelenmiştir. Aşınma testleri 20, 40 ve 60 N yükler altında 1m/sn kayma hızında ve 1800 m kayma mesafesinde gerçekleştirilmiştir. Aşındırma sırasında pim numune sıcaklıkları, malzemenin sertliği ile artmıştır. TiN kaplaman...
Bu çalışmada, AISI 3343 çeliğinin aşınma davranışı üzerinde fiziksel buhar birikim metodu ile CrN kaplamanın etkisi araştırılmıştır. Aşınma testleri, disk üzerinde pim cihazında 10 N yük altında, 0,4 m/s kayma hızında ve 500 m, 750 m ve 1000 m kayma mesafelerinde gerçekleştirilmiştir. Deneysel sonuçlar, CrN kaplamalı numunenin, kaplamasız numuneden...
In this paper, effect of secondary ageing process on the hardness and the abrasive wear resistance of AlSi10Mg casting alloys was studied. In the T6 temper heat treatment, AlSi10Mg alloy was aged at 170 ˚C for 4 hours. In secondary ageing process, AlSi10Mg alloy aged at 170 ˚C for 10 or 30 minutes was re-aged at 100 ˚C for 135 hours. Abrasive wear...
ZET Bu çalışmada, döküm sıcaklığı ve basıncının yaş kum kalıplar kullanılarak geleneksel yerçekimi (gravity casting) ve yerçekimine ters döküm (counter gravity casting) yöntemleri ile üretilen Al-% 10 Si alaşımının yapı ve mekanik özelliklerine etkileri araştırılmıştır. Alaşıma ait numuneler 600, 640 ve 690°C sıcaklıklarda 100, 200, 250, 300 ve 500...
Bu çalışmada, silika parçacık takviyeli Al matrisli kompozitlerin iki gövdeli abrasif aşınma davranışı incelenmiştir. Metal matris kompozitler vakum infiltrasyon yöntemi ile üretilmiştir. Takviye olarak ortalama 120 and 80 ^m boyutlarına sahip SiO2 parçacıklar kullanılmıştır. Metal matris ile takviye arasındaki ıslatabilirliği teşvik etmek için Al1...
ZET Bu çalışmada, yaş kum kalıplar kullanılarak geleneksel yerçekimi (gravity casting) ve yerçekimine ters döküm (counter gravity casting) yöntemleri ile üretilen parçaların besleme özellikleri üzerine döküm sıcaklığı ve basıncın etkisi araştırılmıştır. Deneysel çalışmalarda Al-% 10 Si döküm alaşımı kullanılmıştır. Numuneler 600, 640 ve 690 °C sıca...
In this study, the effect of austempering time on abrasive wear of austempered ductile iron was studied. Ductile iron was austenitized at 900˚C for 60 minutes and austempered 325 C for 1, 2 ve 4 hours. Abrasive wear test of as-cast and austempered ductile iron was performed on pin on disk wear tester under 20 and 30 N at the sliding speed of 0.4 m....
zet: Bu çalışmada, AISI 4140 çeliğinin uygulanan borlama ısıl işlem süresinin bor katman kalınlığı ve katman kalınlığının abrasif aşınma davranışına etkileri araştırılmıştır. AISI 4140 çeliği numuneleri, borlama işlemleri için Ekabor içerisine gömülerek 900˚C'de 2, 4 ve 6 saat sürelerde östenitlenmiş ve daha sonra havada soğumaya bırakılmıştır. Num...
zet: Bu çalışmada, AISI 4140 çeliğinin uygulanan borlama ısıl işlem süresinin bor katman kalınlığı ve katman kalınlığının abrasif aşınma davranışına etkileri araştırılmıştır. AISI 4140 çeliği numuneleri, borlama işlemleri için Ekabor içerisine gömülerek 900˚C'de 2, 4 ve 6 saat sürelerde östenitlenmiş ve daha sonra havada soğumaya bırakılmıştır. Num...
In this study, the effect of TiN coating by physical vapour deposition method on wear behaviour of austempered ductile iron was studied. For this purpose, austenitising at 900°C for 60 min and later austempering at 360 °C for 30 and 90 min was applied to the specimens. After heat treatment, the surfaces of these samples were coated TiN by PVD metho...
In this study, effect of counter gravity casting method on the adhesive wear behaviors of AlSi alloy was investigated. The counter gravity casting and gravity casting specimens were produced by pouring at 600, 640 and 690 °C, with 100, 250 and 500 mmHg vacuum level in sand mould. These specimens were tested on the modified pin on disk adhesive wear...
In this study, effect of boronizing surface treatment on adhesive wear behavior of ferritic-pearlitic ductile iron was studied. Boronizing was performed in Ekabor II boronizing agent at 960 degrees C for 6 hours. Adhesive wear test was performed on pin on disc type wear tester under the load of 60 N, at sliding speed of 1 m/s for 3600 m, 7200 m ve...
zet Bu çalışmada, toz metalurjisi yöntemi ile üretilen Al matrisli B 4 C parçacık takviyeli kompozitlerin kuru kayma koşullarındaki aşınma davranışları incelenmiştir. Kompozitlerin karekterizasyonu mikroyapı incelemeleri, sertlik ölçümleri ve abrasif aşınma deneyleri ile yapılmıştır. Abrasif aşınma testleri, 180 ve 400 Mesh Al 2 O 3 zımpara kullanı...
ZET Bu çalışmada, geleneksel yerçekimi ve yerçekimine ters döküm yöntemleri ile üretilen AlSi alüminyum alaşımı-nın adhesif aşınma davranışı incelendi. Numuneler, yerçekimine ters ve geleneksel döküm yöntemleri ile yaş kum kalıba 600, 640 ve 69C sıcaklıkta, 100, 250 ve 500 mmHg vakum şartlarında dökülerek üretildi. Bu nu-muneler, disk üzerinde pim...
In this study, wear behavior of B4C particle reinforced Al matrix composites produced by powder metallurgy technique has been investigated under dry sliding conditions. Characterization of composites were determined by microscopic examinations, hardness measurements and abrasive wear tests. Abrasive wear tests were conducted with 180 and 400 Mesh A...
In this study, effect of boronizing surface treatment on adhesive wear behavior of ferritic-pearlitic ductile iron was studied. Boronizing was performed in Ekabor II boronizing agent at 960 °C for 6 hours. Adhesive wear test was performed on pin on disc type wear tester under the load of 60 N, at sliding speed of 1 m/s for 3600 m, 7200 m ve 10800 m...
![Fig. 1. Pin-on disc abrasive test apparatus [27].](profile/Mahmut-Izciler/publication/223634789/figure/fig1/AS:643900939190280@1530529355635/Pin-on-disc-abrasive-test-apparatus-27_Q320.jpg)
In this study, AISI 8620 steel was boronized using the solid state boronizing technique. Processes were carried out at the temperatures of 850, 900 and 950 °C for 2, 4 and 6 h of treatment. Abrasive wear behavior of the samples boronized at different temperatures and treatment durations have been examined. Using boronized and unboronized samples, a...
In this work, the effect of austenitization period and the abrasive particle size of abrasive wear behaviours of austempered ductile iron (ADI) was investigated. Unalloyed ductile iron was austenised at 850˚C for 30, 60 and 90 min and austempered at 400 ˚C for 60 and 120 min. The austempered ductile cast iron (ADI) specimens were abraded on the pin...
Bu çalışmada, Ç 1050 çeliğin abrasif aşınma davranışına uygulanan ısıl işlemlerin ve bu işlem sırasında uygulanan östenitleme sıcaklığı ve süresinin etkisi araştırılmıştır. Ç 1050 numuneler, 850˚C’de 30 ve 60 dakika, 800 ve 950˚C’de 30 dakika östenitlenmiş ve daha sonra havada soğumaya bırakılmıştır. Tam tavlanmış, satınalınmış haldeki ve ısıl işle...
In this study, the effect of the reinforcing particle size on the abrasive wear behaviour of Al-55vol.% SiC particulate (SiC p) reinforced composites produced by pressure infiltration technique has been investigated. Abrasive wear tests were carried out under the normal loads of 12, 24 and 36 N, against to 100, 280 and 500 mesh abrasive Al 2O 3 pap...
In this study, the effect of the matrix structure on the dry sliding wear behaviour, friction coefficient and pin temperature of ductile irons was investigated. Wear tests were carried out at normal atmospheric conditions and room temperature on a pin on disc type tester at constant sliding speed (1ms-1) and sliding distance (3.6 km) under various...
In this study, ductile iron was austenised at 900°C for 1 h and austempered at 400°C for 2 h in single step austempering process, whereas it was austenised at 900°C for 1 h and immediately quenched in a salt bath at 400°C for 10 minutes and then the temperature of bath was decreased by 1.88°C per minutes down to 250°C in two-step austempering proce...
In this study, the effects of pouring temperature and pressure on structure and mechanical properties of Al - 10% Si alloys produced by green sand mold traditional gravity casting and counter gravity casting methods were investigated. The specimens were poured at 600, 640 and 690°C temperature under 100, 200, 250, 300 and 500 mmHg vacuum level. The...
ABSTRACT: In this study, effects of Mg and Ni on the abrasive wear behaviours of Al-Cu casting alloys was investigated. Al-Cu alloy containing 0.83, 1.28, 0.80 and 1.21 wt. % Mg ve 0.93, 0.95, 1.38 ve 1.87 wt. % Ni were poured into cast iron mold. Specimens were tested on the modified pin on disk abrasive wear tester. Abrasive wear tests were perfo...
In this study, effect of casting temperature and pressure on feeding properties of specimens produced by green sand mould traditional gravity casting and counter gravity casting was investigated. In experimental study Al - 10% Si casting alloys was used, the specimens were poured at 600, 640 and 690°C temperature, under 100, 200, 250, 300 and 500 m...
ABSTRACT
In this study, effect of casting temperature and pressure on mechanical properties of specimens produced by green sand mould traditional Gravity Casting and Counter Gravity Casting was investigated. In the experimental study, Al - 10 % Si casting alloys was used. The specimens were poured at 600, 640 and 690 C temperature, under 100, 200,...
ABSTRACT
In this study, effect of counter gravity casting method on the abrasive wear behaviours of Al10Si aluminum alloy was investigated. The counter gravity sand casting and gravity sand casting specimens were poured at 640 ˚C. The specimen produced by counter gravity casting at the vacuum level of 250 mmHg has the highest hardness. This specime...
In this study, effect of casting temperature and pressure on microstructure and mechanical properties of specimens produced by green sand mould traditional Gravity Casting and Counter Gravity Casting was investigated. In experimental study Al - 10 % Si casting alloys was used. The specimens were poured at 640 and 690 C temperature, under 300 and 5...
This study was carried to investigate the variation of nodule count and size depending on austempering heat treatment conditions in austempered ductile iron. Postinoculation of 0.5 and 1.5 % FeSi was performed to change nodule count and size in the as-cast condition. Y-Block specimens, with ferritic and pearlite + ferritic microstructure were cast...
ZET Sıvı metalin temizlenmesi için bir çok yöntem kullanılmaktadır. KGDD'de kirliliklerin bulunması mekanik özellikleri ciddi şekilde azaltabilmektedir. KGDD'den filtrasyon yoluyla inklüzyonların giderilmesi gelişmiş mekanik özellikler sağlamaktadır. Filtrasyon için birçok farklı tip filtreler bulunmaktadır. Bu çalışmada filtrasyon işleminde serami...
In this study, Al-10Si/SiC p metal matrix composites with various particulate volume fractions were produced by vacuum infiltration. Al-10Si alloy was infiltrated into the compacts, which are SiC particulates mixed Al and Mg powders inside the steel tubes. Infiltration behaviour and microstructures of the composites were investigated. Processing pa...
In this study, effect of counter gravity casting method on the adhesive wear behaviours of Al-10Si alloy was investigated. The counter gravity sand casting and gravity sand casting specimens were poured at 600, 640 and 690 ûC, 100, 250 and 500 mmHg vacuum level. These specimens were tested on the modified pin on disk adhesive wear tester. Adhesive...
In this study, effects of Si additions to AZ91 Mg alloy in the ranges between 0.2-2 wt. %, aiming to develop its casting properties, was investigated. Results showed that the hot tearing was increased whereas fluidity was decreased with increasing Si content. Tensile and yield strength increased with increasing Si contents. The hardness values decr...
Usually, die costs about 20% of the per work piece cost of aluminum die-casting. The most important issue is die life in the die-casting process. Die damage occurs as results of thermal/stress cracks, wash-out and soldering. Soldering is defined as adhesion of melted Al alloys to die surface. Wash-out usually is caused by melted Al alloys that are...
In this study, ductile iron was austenised at 900 oC for 1 h and austempered at 400 0C for 2 h in single step austempering process, whereas it was austenised at 900 o
