The Effect of element additions on the microstructure and the mechanical properties of cobalt based superalloys produced via powder metallurgy technique

Year 2017, Volume: 21 Issue: 2, 223 - 231, 01.04.2017

Özgür Özgün , Ömer Faruk Akbulut

https://doi.org/10.16984/saufenbilder.297019

Cited By: 1

Abstract

In this
study, the effect of Fe and B elements on the microstructure and mechanical
properties of Stellite 6 superalloy materials produced from elemental powders
by powder metallurgy (P/M) technique was investigated. Powder mixtures
contained different Fe and B content were prepared from high purity elemental
powders.  The prepared powder mixtures
were shaped by P/M method and then sintered at various temperatures. The
success of sintering operations was determined by density measurements.
Microstructural characterization was carried out with X-ray diffraction
analysis (XRD), scanning electron microscope (SEM) and energy dispersive
spectrometry (EDS). Microhardness measurements were conducted for to
characterize mechanical properties. Due to large particle size of the used Cr
powder coarse carbides formed in the microstructure of Stellite 6 samples.
Relative density values increased slightly with B addition. Relative density
was increased dramatically by the addition of Fe element with B.

Keywords

Stellite 6, B addition, Fe addition, density, microstructure, hardness

Toz metalurjisi tekniği ile üretilen kobalt esaslı süperalaşımlarda element ilavelerinin mikroyapı ve mekanik özelliklere etkisi

Abstract

 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.

Keywords

Stellite 6, B ilavesi, Fe ilavesi, yoğunluk, mikroyapı, sertlik

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