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In this study; The effect of the heat treatment applied to the samples taken from the domestic production gear part used in the construction machinery, on the heavy abrasive wear is investigated. Samples removed from the threaded part were allowed to stand at 900 ºC for 1 hour and then cooled by quenching. Water samples were tempered at 400 ºC for 1.5 hours. Non-heat-treated and heat-treated samples were subjected to abrasive wear test against 60 mesh Al2o3 sandpaper under 40N, 80N, and 120N load. The abrasive wear resistance of the examined domestic nail in severe abrasive wear conditions improved by 37% in heat treatment

International Iron & Steel Symposium
UDCS

Cemal ÖZGENÇ Hayrettin Ahlatçı Yunus Türen Süleyman Yaşın Esma KESKİN Mustafa Ali KÜÇÜK Yasin SUBAŞI Burcu Çetintaş

Powder metallurgy method is production of parts widely used today. This use is widely used in many areas of the steel materials industry, especially from powder metal parts produced by powder metallurgy method. Since these materials take the form of the final product at the end of production without requiring any machining process. Also, these materials can be used as an iron based bearing material because of the machine parts such as filter, cutting tool bits and they have self-lubricating property due to its porosity. The aim of this study is; stainless steel matrix, boron carbide reinforcement in different ratios (5%, 10%, 15%) is the production of functional graded material. For this reason, stainless steel and boron carbide powders were mixed in V-type mixer for 3 hours. After this process, the samples were produced by means of powder metallurgy under pressure of 45 MPa at 900°C in the hot press machine. The microstructure and boron carbide distribution of the produced samples were examined in the SEM device and hardness measurements were made in order to observe the changes in mechanical properties. When microstructures were examined, it was determined that boron carbides were distributed homogeneously. It was observed that the hardness increased as the rate of support and the transition between the stages increased.

International Iron & Steel Symposium
UDCS

Batuhan Özusta Yasin Akgül Hayrettin Ahlatçı Süleyman Yaşın İsmail Esen Yavuz Sun Yunus Türen

In this study; The effect of the solution and aging heat treatments on the corrosion behavior on high chromium cast steel samples with the compositon of 1.61% C + 25% Cr + 0.74% Si + 0.55% Mn + 0.38% Mo + 0,23% Ni + 0.15% V were investigated. The samples solution heat treatment - rapid cooled for 4 hours at 1150 ℃, aged for different times between 5-25 and in cast (original) status were subjected to corrosion treatment. Corrosion behavior was investigated by immersion method in 10% FeCl3 and 10% H2SO4 medium. As a consequence, the least corrosion rate was seen on the sample kept at the solution condition and then cooled by water rapidly while higher corrosion rates were observed on cast (original) status and aged samples.

International Iron & Steel Symposium
UDCS

Mustafa Ali KÜÇÜK Hayrettin Ahlatçı Yunus Türen Soner Arı Yasin SUBAŞI Süleyman Yaşın

In this study; The effect of heat treatment of ER7 quality train wheel samples was investigated under severe abrasive wear. The train wheel of ER7 quality samples were heated to 900 oC and brought to austenite phase for 1 hour, then cooled by water. Cooled samples were tempered at 400oC for 1.5 hours. Severe abrasion test was applied to the samples on sandpaper containing 210 µm Al2O3 particle under 40N, 80N and 120N loads. Microstructure and hardness measurements of samples were investigated after quenching and tempering heat treatment. As a result of these tests, the abrasive wear resistance of the heat treated sample by containing by a 3-fold increase in hardness improved by 36%.

International Iron & Steel Symposium
UDCS

Burcu Çetintaş SAİT ÖZÇELİK Süleyman Yaşın Yusuf Gökalp Ali Akkuş Emre Demirci

Bu çalışmada, patlamalı kaynak tekniği ile üretilmiş alüminyum-çelik-alüminyum tabakalı kompozit numunelerin, plaka yorulma cihazı ile, yorulma davranışı incelenmiştir. Kompozit imalatında, 0.5 mm kalınlığında 1110 kalite çelik ve 1.5 mm kalınlığında 1050 kalite alüminyum saclar kullanılmıştır. Tabakalı kompozitlerle imal edilen plaka parçalar dinamik yüklemelere maruz kaldığı için yorulma davranışının bilinmesi önem arz etmektedir. Tabakalı kompozitler özellikle plaka halde kullanıldığından Şekil 1’de görülen plaka yorulma test numunesi Şekil 2’de verilen plaka yorulma test cihazı ile incelenmiştir.

International Symposium on Light Alloys and Composite Materials
UHAKS

Sakine Obuz Gülcan Çetin Fikri Günsur İlayda Şahin Furkan ACAR Sait Özçelik Mustafa ACARER Süleyman Yaşın Yunus Türen Yavuz Sun Hayrettin Ahlatçı

In the study, the AZ31 and AZ31+ La%0.2 Mg alloys were produced by low pressure casting method following homogenization at 400°C for 24 hours and the hot rolling process applied with 15% deformation rate per pass at 400°C. The surface treatment process of shot peening was practised on materials for enhancement corrosion properties of them. To observe corrosion behaviour of investigated alloys the immersion corrosion test in %3.5 NaCl environment and metallographic examination were utilized.

International Symposium on Light Alloys and Composite Materials
UHAKS

Soner Arı İsmail Hakkı Kara Medine Kılıç Yaren Karauğuz Okan Ünal Yunus Türen Yavuz Sun Süleyman Yaşın Batuhan Özusta Hayrettin Ahlatçı

In the study, the AZ31 and AZ31+ La%0.5 Mg alloys were produced by low pressure casting method following homogenization at 400°C for 24 hours and the hot rolling process applied with 15% deformation rate per pass at 400°C. The surface treatment process of shot peening was practised on materials for enhancement mechanical properties of them. The surface roughness of AZ31 and AZ31+ La%0.5 Mg alloys how is developed by shot peening process also was determined.

International Symposium on Light Alloys and Composite Materials
UHAKS

Nihal Kanca İsmail Hakkı Kara Özlem Keleş Canan Dursun Okan Ünal Yunus Türen Yavuz Sun Hayrettin Ahlatçı Süleyman Yaşın

Magnezyum otomotiv, havacılık, ilaç, spor ve taşınabilir mikroelektronik sistemler gibi endüstrilerde yaygın olarak kullanılan düşük yoğunluk ve yüksek dayanım özelliği gösterebilen, alaşımlandırılabilir bir malzeme olarak yaygın olarak kullanılmaktadır [1,2]. Bu çalışmada Magnezyum (Mg) malzemeye üç farklı oranda Kalay (Sn) ilavesinin (%3, %6, %9), Magnezyum malzemenin işlenebilirliğinde yüzey pürüzlülüğüne etkisi araştırılmıştır. Magnezyum malzemeye kalay ilavesi yapılarak 50 mm çapında Mg-Sn alaşımı çubuk malzeme üretilmiştir. Bu malzemeler, PID (Proportional Integral Derivative) denetim yöntemi ile motor kontrolü yapılan CNC tabanlı bir tezgâhta işleme deneylerine tabi tutulmuştur. Deneyler sonucunda PID sistemde işlenen iş parçalarının yüzey pürüzlülükleri ölçülmüştür ve performans açısından karşılaştırılmıştır. Deneylerde kullanılan işleme parametreleri Tablo 1’de verilmiştir. Kesme işleminde TCGT 16T308-270 kesici takım ve uygun takım tutucu kullanılarak işlem gerçekleştirilmiştir (Şekil 1)

International Symposium on Light Alloys and Composite Materials
UHAKS

Metin ZEYVELİ Yunus Türen Abdulrezzak ERDEM Süleyman Yaşın

Bu çalışma kapsamında 1075 ve 15N20 kalite çeliklerinden patern kaynağı yöntemiyle imal edilmiş olan damascus çeliğinin mikroyapı analizleri, vickers sertlik değerleri, darbe-çentik enerjisi değerleri ve standartlarca hazırlanan numunelerle(Şekil.1) yapılan yorulma deneyinden elde edilen sonsuz yorulma ömrü ve wöhler eğrisi belirlenmiştir. İncelenen damascus çeliği korozyon dayanımları ve mekanik özellikleri birbirinden farklı olan 1075 ve 15N20 kalite çeliklerinden patern kaynağı yöntemiyle imal edildiğinden dolayı tabakalı çelik-çelik kompozit bir yapıya sahiptir.[1-8] Yüksek mukavemetli çeliklerin alternatifi düşünülebilecek damascus çeliğinin hareli(tabakalı) yapısının dinamik yükler karşısında sergileyeceği yorulma davranışının belirlenmesi amacıyla plaka yorulma deneyi şuana kadar başka bir çalışmada yapılmamıştır.

International Symposium on Light Alloys and Composite Materials
UHAKS

Furkan ACAR Fatma KÖZ Hakan KIRDAN SAİT ÖZÇELİK Yavuz Sun Yunus Türen Süleyman Yaşın Emre Demirci Hayrettin Ahlatçı