Hasan HasirciGazi University · Department of Metallurgical and Materials Engineering
Hasan Hasirci
Assoc. Prof. Dr.
University-Industry R&D projects, TEYDEB, .......
About
45
Publications
9,434
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170
Citations
Citations since 2017
Introduction
Materials and Metallurgy, Casting, Heat Treatment, Coating, Composites,
Additional affiliations
January 1997 - present
Education
September 1992 - June 1997
Gazi University Teknik Eğitim Fakültesi
Field of study
- Lisans Eğitimi
Publications
Publications (45)
This study presents the results of machining tests carried out to determine the effect of microstructure and mechanical properties of austempered ductile irons (ADIs) on cutting forces and surface roughness. Specimens were prepared under different austempering times with the addition of Cu and Ni at various contents. Six different specimen groups w...
Due to its enhanced strength, ductility and toughness, ductile iron has poor machining properties when compared to flake graphite cast iron. However, when a steel part is replaced with ductile iron, better machinability is considered to be the most important gain. This study presents the results of machining tests of ductile irons (DIs) alloyed wit...
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...
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 microstructure and corrosion properties of Vermicular Graphite Cast Iron (VGCI) produced via different methods and parameters were investigated. VGCI was produced from a base ductile iron material using different proportions of vermiculariser and inoculant. Copper was added to a group of samples as an alloying element. The micros...
Katmanlı imalat prosesinde, bilgisayar destekli tasarım
(CAD) ile parçanın üç boyutlu geometrisini temsil eden
katı veya yüzey model dosyasının bilgisayar ortamında
oluşturulmasını, parça model dosyasının (stl) katmanlı
imalat tezgahlarının kabul yapabileceği formata dönüşümü aşaması, yazdırma öncesinde farklı yazılımlar [3,
4] vasıtası ile iş hazı...
In this study, the effect of Al and AlTiB (0, 2.5, 5, 10 and 15 wt%) on the microstructure and mechanical properties of a MgZnSn based alloy were investigated. The alloys were produced under a controlled CO2 atmosphere by a green sand casting process. The results show that the addition of Al and AlTiB alloys modified the structure and decreased the...
In this study, the effects of pressure (vacuum) on solidification characteristics of specimens produced by isolated sand mould, conventional gravity casting and counter gravity casting were investigated. In this work, the effects of counter gravity casting process parameters on grain size, cooling rate and other thermal characteristic results of Al...
The use of aluminium (Al) dross with casting residue instead of Al-Ca-Mg alloy used as degasser in steel casting processes was investigated in this study. This dross has not been subjected to any purification (purification, cleaning) process and also has no economic value.
Samples were produced by GS-52 steel material using resin sand casting. The...
Composite products are increasingly important materials. Metal-metal composites are composites that have increased rapidly in recent years. Composite materials are produced for a variety of purposes and using different techniques. In this study, the use of casting technique in metal-metal composite production, the application of heat treatment and...
New material groups such as composites, superalloys and high-tech ceramics come into play, especially when the desired properties of metallic materials cannot be counted under severe operating conditions such as high temperature, corrosion and abrasion. For this purpose, hi-tech ceramics are being applied on metal surfaces as oxide, carbide, nitrid...
This paper is prepared to show the effects of production conditions on the manufacturability and structural properties of Compacted Graphite Cast Iron (CGI) material. Since this material is intended for high speed brake disc production, 45-50% vermiculization is regarded as sufficient for suitability for the usage conditions. Because they require r...
The aim of this study is to evaluate the advantageous aspects of the Lost Foam Casting (LFC) process in the production of parts that are of high quality and that the industry needs. High quality, high precision, thin section and superior feature parts production is possible by the LFC method. The BMD method has fewer and easier production steps com...
In this study; It is aimed to investigate the effects of the use of controlled atmosphere casting unit to be used in the production of Mg alloys for the design, manufacture and casting operations. Since Mg alloys are easily affected by the atmosphere, casting in normal atmosphere is almost impossible. For this reason, Mg alloys casting requires the...
This study was carried out to determine the most suitable cryogenic heat treatment conditions to be applied to ETİAL 171 alloy. For this purpose different heat treatment conditions were applied and the results obtained were evaluated. When the results are examined; It has been found that the most favorable conditions are achieved by heat treatment...
This study are evaluated that sound and high-quality of parts at the industry needs produced by low-pressure casting method. It is possible that parts have high-quality and properties produced by Low Pressure Casting (LPC) method. The parts have non-inclusions, low porosity and high mechanical properties produced by the LPC method. This process can...
Mekanik Titreşimin Küresel Grafitli Dökme Demirlerin Mikroyapı Ve Mekanik Özelliklerine Etkileri
ÖZET
Bu çalışmada Küresel Grafitli Dökme Demirlerin (KGDD) mikro yapı ve mekanik özellikleri üzerine mekanik titreşimin etkileri incelenmiştir. Dökümler geleneksel yaş kum kalıpta yapılmıştır. Bu çalışmada, ferritik KGDD (GGG 40) malzeme kullanılmıştır...
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...
Bu çalışmada, ötektik AlSi alaşımının yapı, mekanik özellikleri ve abrasif aşınmasına uygulanan ısıl işlem şartlarının etkileri araştırılmıştır. Numuneler 610C sıcaklıkta dökülmüş, ardından farklı koşullarda ısıl işlem uygulanmıştır. Abrasif aşınma testleri, disk üzerinde pim aşınma test cihazında, 10 ve 30N yük altında, 0.1 m s-1 kayma hızında, 2...
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...
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....
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...
In this study, effect of casting temperature and pressure on castabilitiy character 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...
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, effects of wear speeds on the adhesive wear behavior of heat treated AISI D6 steel were investigated. In normalization, steel specimens were austenitized at 900 and 950 °C for 30 minutes and then aircooled. Sample was annealed at 850 °C for 30 minutes. Adhesive wear tests were performed by pin-on-disc adhesive wear tester under loads...
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...
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...
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 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...
Due to the enhanced strength, ductility and thoughness of Ductile Iron (DI) when compared to the other types cast iron, its machinability is relatively poor. When a steel part is replaced with ductile iron, however, better machinability is considered to be the most important gain. This study presents the results of machining tests of ductile irons...
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...
