saujs Sakarya University Journal of Science 2147-835X Sakarya University 10.16984/saufenbilder.297019 Material Production Technologies Malzeme Üretim Teknolojileri The Effect of element additions on the microstructure and the mechanical properties of cobalt based superalloys produced via powder metallurgy technique Toz metalurjisi tekniği ile üretilen kobalt esaslı süperalaşımlarda element ilavelerinin mikroyapı ve mekanik özelliklere etkisi Özgün Özgür Akbulut Ömer Faruk 04 01 2017 21 2 223 231 10 24 2016 11 30 2016 Copyright © 1997, Sakarya University Journal of Science 1997 Sakarya University Journal of Science

In thisstudy, the effect of Fe and B elements on the microstructure and mechanicalproperties of Stellite 6 superalloy materials produced from elemental powdersby powder metallurgy (P/M) technique was investigated. Powder mixturescontained different Fe and B content were prepared from high purity elementalpowders. The prepared powder mixtureswere shaped by P/M method and then sintered at various temperatures. Thesuccess of sintering operations was determined by density measurements.Microstructural characterization was carried out with X-ray diffractionanalysis (XRD), scanning electron microscope (SEM) and energy dispersivespectrometry (EDS). Microhardness measurements were conducted for tocharacterize mechanical properties. Due to large particle size of the used Crpowder coarse carbides formed in the microstructure of Stellite 6 samples.Relative density values increased slightly with B addition. Relative densitywas increased dramatically by the addition of Fe element with B.

Bu çalışmada, toz metalurjisi (T/M) tekniği ile element tozlarından üretilen Stellite 6 süperalaşım malzemelerin mikroyapı ve mekanik özelliklerine Fe ve B elementlerinin etkisi incelenmiştir. Yüksek saflıktaki element tozlarından farklı oranlarda Fe ve B içeriğine sahip karışım tozlar hazırlanmıştır. Hazırlanan karışımlar T/M yöntemi ile şekillendirilip farklı sıcaklıklarda sinterlenmişlerdir. Sinterleme işlemlerinin başarısı yoğunluk ölçümleri ile değerlendirilmiştir. Mikroyapısal karakterizasyon X-ışınları analizi (XRD), taramalı elektron mikroskobu (SEM) incelemeleri ve enerji dağılımı spektrometresi (EDS) ile gerçekleştirilmiştir. Mekanik özelliklerin karakterizasyonu için mikrosertlik ölçümleri yapılmıştır. Stellite 6 numunelerinin mikroyapısında, kullanılan Cr tozunun iri boyutlu olması nedeniyle iri boyutlu karbürlerin oluştuğu tespit edilmiştir. B ilavesi ile birlikte bağıl yoğunluk değerleri bir miktar artmıştır. B ile birlikte Fe elementinin ilave edilmesiyle bağıl yoğunluk önemli ölçüde artış göstermiştir.

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