Solid particle erosion behavior of SiMo ductile cast iron

Abstract

SiMo ductile cast iron has been developed to be used at high temperatures as exhaust manifold material. Si and Mo contents in its chemical composition provide high temperature oxidation resistance and high temperature strength.   During service, hot corrosive exhaust gas flows through the exhaust manifold and may cause erosion of the manifold surfaces. Thus, in this study, it was aimed to evaluate the performance of SiMo cast iron under severe solid particle erosion conditions, against aluminum oxide particles at 30°, 45°, 60° and 90° impingement angles. Surface degradation of tested alloys were characterized using scanning electron microscope. It was observed that erosion rate increased with increasing impingement angle up to 45°, then decreased as the angle increased, since the mechanism of material removal changed. While ploughing occurred at lower angles, work hardening took place on the worn surface at higher angles.

Keywords

• SiMo ductile cast iron,solid particle erosion,characterization

SiMo sünek dökme demirin katı partikül erozyonu

Öz

SiMo sünek dökme demir yüksek sıcaklıklarda ekzoz manifold malzemesi olarak geliştirilmiştir. Kimyasal kompozisyonunda bulunan Si ve Mo elementleri yüksek sıcaklık oksidasyon direnci ve yüksek sıcaklık mukavemeti sağlamaktadır. Çalışma koşullarında yüksek sıcalıktaki korozif ekzoz gazı ekzoz manifoldundan geçer ve manifold yüzeyinde erozyona neden olabilir. Bu çalışmada, SiMo dökme demirin katı partikül erozyon davranışının aluminyum oksit partikülleri ile 30°, 45°, 60° ve 90° çarpma açıları kullanılarak incelenmesi hedeflenmiştir.  Yüzeyde meydana gelen bozunmalar tarama elektron mikroskopu kullanılarak incelenmiştir. Erozyon oranı 45° çarpma açısına kadar artış gösterirken, malzeme kaybı mekanizmasındaki değişiklik nedeniyle daha bu oran yüksek açılarda azalmıştır.  Düşük açılarda pulluklama etkin mekanizma iken yüksek açılarda yüzeyde deformasyon sertleşmesi meydana gelmektedir.

Anahtar Kelimeler

• SiMo sünek dökme demir,katı partikül erozyonu

Kaynakça

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