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İÇTEN YANMALI MOTORLARDA ÖSTENİTİK EGZOZ SUPAPLARININ YÜKSEK SICAKLIK AŞINMA MEKANİZMALARININ TESPİTİ

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dc.creator BAYATA, Fatma; İstanbul Bilgi Üniversitesi
dc.date 2021-03-30T00:00:00Z
dc.date.accessioned 2021-12-03T11:45:42Z
dc.date.available 2021-12-03T11:45:42Z
dc.identifier https://dergipark.org.tr/tr/pub/jesd/issue/61057/774005
dc.identifier 10.21923/jesd.774005
dc.identifier.uri http://acikerisim.sdu.edu.tr/xmlui/handle/123456789/93719
dc.description Bu çalışmada 21-4N (%21 Cr, %9 Mn ve %3.88 Ni temel bileşenli alaşım) egzoz supap malzemesinin PL12 alaşımlı beyaz temper dökme demir baga malzemesi karşısında yüksek sıcaklıktaki aşınma davranışı incelenmiştir. Egzoz supap-baga ikilisinin aşınma testleri için özel olarak geliştirilmiş bir tribometre kullanılarak 25 ℃, 350 ℃, 550 ℃’de ve 20 N yük altında testler yapılmıştır. Yapısal ve termodinamik analizler ile 21-4N supap - PL12 baga ikilisinin ara yüzeyinde gerçekleşen yüksek sıcaklık aşınma mekanizması literatürde ilk kez incelenmiştir. Aşınma sırasında uygulanan lokal basınç ve sıcaklık artışı ile spinel oksit yapılardan oluşan, aşınmaya karşı koruyucu bir tabakanın 21-4N yüzeyinde oluştuğu görülmüştür. Bu oluşan tribofilm yüksek sıcaklıklarda 21-4N supap malzemesinin PL12 baga karşısında hacimsel aşınma kaybının azalmasına neden olmuştur. Ayrıca sıcaklığa bağlı oluşan/çözülen karbür ve karbonitrür fazları da termodinamik olarak hesaplanmıştır. Sıcaklık artışı ile pinin mukavemeti azalırken, 21-4N supap malzemesinin 900°C’ye kadar kararlılık gösteren çökelti fazlarından dolayı mekanik özelliklerini koruduğu ve aşınma direncinin arttırdığı tespit edilmiştir.
dc.description In this study, high temperature wear behaviour of 21-4N (%21Cr, %9Mn, %3.88 Ni based alloying elements) exhaust valve material against PL12 alloyed white cast iron seat insert material was investigated. The sliding wear tests were conducted at 25℃, 350℃, 550℃ and under 20N load using a high temperature tribometer which was designed for the wear tests of valve-seat insert couples. By means of structural and thermodynamic analysis, the high temperature wear mechanism that takes place at the interface of 21-4N-PL12 was investigated for the first time. It was determined that the spinel oxide structures formed a tribolayer on the surface 21-4N by the effects of local pressure and high temperature during the sliding. This causes a decrease in volumetric wear loss of 21-4N against PL12 at high temperatures. Additionally, the formed carbide and nitride phases were calculated thermodynamically. While the strength of pin decreases with increasing temperature, 21-4N maintains its mechanical properties and wear resistance increases since the precipitate phases are stable up to 900° C
dc.format application/pdf
dc.language tr
dc.publisher Süleyman Demirel Üniversitesi
dc.publisher Süleyman Demirel University
dc.relation https://dergipark.org.tr/tr/download/article-file/1216514
dc.source Volume: 9, Issue: 1 255-264 en-US
dc.source 1308-6693
dc.source Mühendislik Bilimleri ve Tasarım Dergisi
dc.subject Aşınma,Supap,Baga,İçten Yanmalı Motor,Östenitik
dc.subject Wear,Valve,Valve Seat Insert,Internal Combustion Engine,Austenite
dc.title İÇTEN YANMALI MOTORLARDA ÖSTENİTİK EGZOZ SUPAPLARININ YÜKSEK SICAKLIK AŞINMA MEKANİZMALARININ TESPİTİ tr-TR
dc.title INVESTIGATION OF HIGH TEMPERATURE WEAR MECHANISMS OF AUSTENITIC EXHAUST VALVES IN INTERNAL COMBUSTION ENGINES en-US
dc.type info:eu-repo/semantics/article
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