Doğrusal Katılaştırılmış Sn91.2-x-Zn8.8-Agx Alaşımlarının Mekanik Özelliklerinin İncelenmesi

Year 2016, Volume: 6 Issue: 2, 265 - 272, 01.06.2016

Mevlüt Şahin

Abstract

Bu çalışmada, Sn91.2-x-Zn8.8-Agx x= ağ.% 0.15, 0.3, 0.7, 1.0, 3.0, 10.0 alaşımları vakumlu eritme fırını ve döküm fırını kullanılarak hazırlandı. Daha sonra numuneler sabit fırın sıcaklığında 500 oC , farklı katılaştırma hızlarında 8.3-790 mm/s Bridgman tipi doğrusal katılaştırma fırınında yukarı yönlü doğrusal katılaştırıldı. Katılaştırma hızının V , çekme dayanımına sç ve basma akma dayanımına sb etkisi araştırıldı. Lineer regrasyon analizi ile çekme dayanımının ve basma akma dayanımının katılaştırma hızına bağımlılığı tespit edildi. Katılaştırma hızındaki artışın soğuma hızını artırdığı, soğuma hızındaki bu artışında mikroyapıyı küçülttüğü, bunun sonucunda da çekme ve akma dayanımlarının arttırdığı tespit edildi. Deneysel sonuçlar literatürle karşılaştırıldı

Keywords

Akma dayanımı, Çekme dayanımı, Doğrusal katılaştırma, Katılaştırma hızı

Investigation the mechanical properties of the directionally solidified Sn100-x-Zn8.8-Agx alloys

Abstract

Sn100-x-Zn8.8-Agx x=0.15, 0.3, 0.7, 1.0, 3.0, 10.0 wt.% alloys have been prepared by using vacuum melting furnace and casting furnace. Then the samples have been directionally solidified upwards with a constant furnace temperature 500 oC at different solidification rates 8.3-790 mm/s in a Bridgman type directional solidification furnace. The effect of solidification rate V on ultimate tensile strength su and compressive yield strength sc were investigated. The dependency of ultimate tensile strength and yield strength on solidification rate were determined by the linear regression analysis. It has been found that the increases of the solidification rate refines the microstructure, as a result of this the ultimate tensile strength and yield strength increases. The experimental results compared with the literature.

Keywords

Directional solidification, solidification rate, ultimate tensile strength, yield strength.

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