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ÖN DEFORMASYON VE YAŞLANMANIN MİKROALAŞIM ÇELİKLERİNDEKİ ÇEKME DAVRANIŞINA ETKİSİ

THE EFFECT OF THE PRE-STRAINING AND AGEING ON TENSILE BEHAVIOUR OF MICROALLOYED STEELS

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Abstract (2. Language): 
Bu çalışmada ticari amaçlı olarak üretilen orta karbonlu ve düşük karbonlu mikroalaşım çelikleri kullanılmıştır. Çelikler % 5 soğuk olarak deforme edildikten sonra 100-450 °C sıcaklık aralığında 1 saat yaşlandırılmıştır. Deforme edilen ve yaşlandırılan çelikler daha sonra kopuncaya kadar çekilerek mekanik özellikleri ölçülmüştür. Farklı sıcaklıklarda yaşlandırılan çeliklerin çekme ve akma dayanımı gibi mekanik özelliklerinin değiştiği gözlenmiştir. Yaşlanma, arayer atomlarıyla dislokasyonların arasında meydana gelen etkileşim sonucunda oluşmuştur. Sonuçlar dövme amaçlı üretilen orta karbonlu mikroalaşım çeliklerinin akma ve çekme dayanımlarının artmasından dolayı, düşük karbonlu mikroalaşım çeliklerine nazaran daha fazla gerinim yaşlanmasından etkilendiğini göstermektedir.
Abstract (Original Language): 
Two commercially available medium carbon and low carbon microalloyed steel were evaluated in this study. The steels were cold strained in tension 5 % and were aged at 100-450 °C for 1 hour. Strained and aged specimens were then retested to fracture and mechanical properties of steels were measured. Changes in mechanical properties such as ultimate tensile strength and yield strength were observed at ageing temperatures. This ageing is ass°Ciated with interaction between interstitial solutes and disl°Cations which are preferential sites for solute atom diffusion. Indications are that the medium carbon microalloyed forging steel is more susceptible to strain ageing than the low carbon microalloyed steel as evidenced an increase in yield strength and tensile strength.
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