SEARCH RESULT

This study includes device design and design for determining the performance of rigid round thin wires under a bending rotating fatig load over a given lifetime. Small diameter wires are thin wires with a diameter equal to or greater than 1.60 mm (0.63 inch). Bending rotating fatig tester ensures that the wire is rotated at constant speed and subjected to constant amplitude bending deformation. For this purpose, the wire retaining pliers are parallel to each other and the wire between the pliers is 180° paralel. After the speed is entered to the driver, the AC motor power is started by means of the belt-pulley and then transferred to the gears with the help of the cardan shaft. The number of cycles is transmitted to the counter by the encoder and recorded. The number of cycles can be generated in response to the bending deformation applied. The test device was reproducible and healthy.

International Iron & Steel Symposium
UDCS

Emre Demirci Hayrettin Ahlatçı Yavuz Sun Yunus Türen Hüseyin Koymatcık

In this study, the effect of gas nitration on the wear behavior of crankshaft was investigated. For this purpose, gas nitration was applied to crankshaft for 12 hours at 500 ° C, and hardness and microstructure images were examined. Nitrided and unnitrided samples were subjected to abrasive wear test under 20N, 40N and 60N load. While 100Cr6 balls were used as abrasive, crankshaft with nitriding and unnitriding was used as counter-material. Nitrided samples have increased wear resistance by about 20% compared to the wear resistance of unnitrided crank shaft samples.

International Iron & Steel Symposium
UDCS

Yusuf Gökalp Yavuz Sun Mehmet Ünal Emre Küçük SAİT ÖZÇELİK Ali Akkuş Burcu Çetintaş Emre Demirci

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 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