Tungsten İlavesinin Fe3Al Alaşımının Oksitlenme - Sülfürlenme Özelliklerine ETKİSİ

Year 2011, Volume: 24 Issue: 2, 11 - 22, 30.12.2011

Neşe Öztürk Körpe İbrahim Çelikyürek Remzi Gürler

Abstract

 Fe-28Al ve üçlü Fe–28Al–xW  (x= at.% 0,5; 1 ve 1,5) alaşımlarının, 900– 1000 °C sıcaklık aralığında hacime %6 CO2, %80,6 N2, %13 O2, 4000 ppm SO2 içeren gaz karışımında yüksek sıcaklıklardaki korozyon davranışı çalışılmıştır. Başlangıçtaki hızlı korozyon basamamağından sonra alaşımların 5x10-6 ve 5x10-7 mg2/cm4/sn aralığında hesaplanan parabolik hız sabitleri ile korozyonun parabolik hız kanununa uyduğu bulunmuştur. W elementinin ilavesi ile ikili Fe-28Al alaşımının  yüksek sıcaklık parabolik hız sabitlerinde artış görülmüştür. Ancak katastrofik korozyon görülmemiştir.

Keywords

Demir alüminat, oksitlenme-sülfürlenme..

Effect Of Tungsten Addıtıon On Oxıdatıon-Sulfıdatıon Behavıour Of Fe3al Alloys

Abstract

 The high-temperature corrosion behavior of Fe-28Al and three Fe–28Al–xW (where x=0.5, 1, and 1.5 at.%) ternary alloys were studied in the temperature range of 900–1000 °C in N2/O2/CO2/SO2 mixed gases. After an initial corrosion stage, the oxidation obeyed the parabolic rate law, with parabolic rate constants with curve fits over the entire exposure range from 5x10-6to 5x10-7 mg2/cm4/s calculated. It was found that the additon of W increased the parabolic rate constants of the  Fe–28Al base alloy studied. No catastrophic corrosion behavior was observed. 

Keywords

Iron Aluminide, Oxidation-sulfidation. .

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