STATISTICAL ANALYSIS ON THE EFFECT OF THE SOLIDIFICATION RATE AND QUENCHING MEDIUMS ON MECHANICAL PROPERTIES IN ETIAL 221 ALLOY

Abstract

In this study, the effects of different mold types and quenching mediums with different internal stresses on the mechanical properties of ETIAL 221 alloy supplied as a primer were investigated, and analyzed statistically. Firstly, the alloy was poured into the permanent mold (PM) then poured into sand mold with grain size 40/45 and 60/65 AFS. The specimens were subjected to three different T6 heat treatment quenching mediums that are water at room temperature (WRT), oil (OL) and boiling water (BW). The influences of differences in solidification rate due to cooling rates and differences in internal stress due to quenching mediums on mechanical properties were investigated. Additionally, the change in porosity was calculated according to Archimedes principle and obtained results were related to the mechanical properties. The results showed that permanent mold and boiling water quenching medium presented the best mechanical properties for the current study.

Keywords

• ETİAL 221 alloy,Internal stress,Mechanical properties,Solidification rate,Quenching medium,Weibull analysis

ETİAL 221 Alaşımında Katılaşma Hızı ve Su Verme Ortamlarının Mekanik Özelliklere Etkisinin İstatistiksel Analizi

Abstract

Bu çalışmada, primer olarak temin edilen ETİAL 221 alaşımında farklı kalıp türlerinin ve farklı iç gerilmelere sahip su verme ortamlarının mekanik özelliklere etkisi araştırılmış ve istatistiksel olarak incelenmiştir. Alaşımın ilk olarak kokil kalıba, daha sonra 40/45 ve 60/65 AFS boyutuna sahip kumlarla hazırlanmış kum kalıba dökümleri gerçekleştirilmiştir. Dökümden elde edilen parçalar oda sıcaklığında suda, yağda ve kaynayan suda su verme işlemleri ile üç farklı T6 çökelme sertleşmesine tabi tutulmuştur. Soğuma hızlarına bağlı katılaşma hızındaki farklılıkların ve su verme ortamlarına bağlı iç gerilme farklılıklarının mekanik özellikler üzerine etkisi araştırılmıştır. Ayrıca, porozitedeki değişim Arşimet prensibine göre hesaplanmış ve elde edilen sonuçlar mekanik özellikler ilişkilendirilmiştir. Sonuç olarak, kalıp türlerinden kokil kalıbın, su verme ortamlarından kaynayan suda su verme ortamının bu çalışma için en iyi mekanik özellik sergilediği görülmüştür.

Keywords

• ETİAL 221 alaşımı,su verme ortamı,katılaşma hızı,iç gerilim,mekanik özellikler,Weibull analizi

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