TY - JOUR T1 - ÖSTEMPERLENMİŞ KÜRESEL GRAFİTLİ DÖKME DEMİRİN ABRASİV AŞINMA DAVRANIŞINA ÖSTEMPERLEME İŞLEMİNDE SOĞUTMANIN ETKİSİ TT - EFFECT OF THE COOLING IN THE AUSTEMPERING PROCESS ON THE ABRASIVE WEAR BEHAVIOR OF AUSTEMPERED DUCTILE IRON AU - Çetin, Melik AU - Gül, Ferhat PY - 2013 DA - March JF - Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi JO - GUMMFD PB - Gazi Üniversitesi WT - DergiPark SN - 1300-1884 SP - 359 EP - 366 VL - 21 IS - 2 LA - tr AB - Bu çalışmada, geleneksel tek kademeli östemperleme işleminde, küresel grafitli dökme demir (KGDD)numuneler 900oC’de 1 saat östenitlenmiş, müteakiben tuz banyosunda 400oC’de 2 saat östemperlenmiştir. İkikademeliöstemperleme prosesinde ise KGDD numuneler 900oC de 1 saat östenitlendikten sonra derhal 400oC’lik tuz banyosuna aktarılmış, 10 dakika bu sıcaklıkta bekletildikten sonra banyonun sıcaklığı 1.88oC/dak hızla 250oC’a soğutulmuştur. Geleneksel tek kademeli östemperleme prosesi ile üretilen üst ösferritik ve ikikademeli prosesle üretilen üst ve alt ösferritik Östemperlenmiş Küresel Grafitli Dökme Demir (ÖKGDD) numunelerin abrasiv aşınma deneyleri, disk üzerinde pim cihazında 10, 20 ve 30 N normal yük altında, 180 mesh (80 μm) boyuta sahip Al2O3 zımpara üzerinde gerçekleştirilmiştir. İki kademeli östemperleme prosesiyle üretilen küresel grafitli dökme demirin sertliği, tek kademeli prosesle üretilen dökme demirinkinden daha yüksek olmasına rağmen, her iki dökme demirin benzer abrasiv aşınma davranışı sergilediği görülmüştür. Ayrıca iki kademeli östemperlenmiş küresel grafitli dökme demirde abrasiv aşınma direnci uygulanan yükün artmasıyla artmıştır. KW - Abrasive aşınma KW - östemperlenmiş küresel grafitli dökme demir KW - sertlik KW - mikroyapı. N2 - In this study, ductile iron was austenised at 900 oC for 1 h and austempered at 400 0C for 2 h in single stepaustempering process, whereas it was austenised at 900 oC for 1 h and immediately quenched in a salt bath at400 oC for 10 minutes and then the temperature of bath was decreased by 1.88 oC per minutes down to 250 oC intwo-step austempering process. The upper ausferritic austempered ductile iron (ADI) specimens produced byconventional single step austempering process and the upper and lower ausferritic specimens produced by twostep austempering process were abraded on the pin on disc apparatus under the normal load of 10, 20, 30 N, byrubbing the specimens on abrasive Al2O3 grains with diameters of 180 Mesh (80 µm). Although the ductile ironaustempered in two steps had higher hardness than the ductile iron austempered in single step, they showedsimilar abrasive wear behavior. 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