Farklı Şartlarda Borlanan Hardox 400 Çeliğinin Mekaniksel Özelliklerinin İncelenmesi

Year 2019, , 15 - 22, 01.11.2019

Mehmet Tabur , Mahmut İzciler

https://doi.org/10.35354/tbed.510831

Abstract

Bu çalışmada, aşınmaya dayanıklı Hardox 400 çeliğine 2, 4 ve 6 saat sürelerde;
850 ºC, 900 ºC ve 950 ºC sıcaklıklarda kutu sementasyonu yöntemi uygulanarak
bor difüze edilmiş ve çelik üzerinde oluşturulan borürlerin bazı mekanik
özellikleri incelenmiştir. Borlama malzemesi olarak ticari şekilde piyasada
bulunan EKabor® 2 tozu kullanılmıştır. İşlem sıcaklık ve süresine bağlı olarak
borür katmanının derinliği 80 µm ile 300 µm arasında değişmiştir. Daha uzun
borlama süresinin daha kalın katman oluşmasını sağladığı görülmüştür. Çelik ana
malzemenin üzerinde oluşan borürlerin düzgün ve dallı bir morfolojiye sahip
olduğu Taramalı Elektron Mikroskobu (SEM) ve optik incelemeler sonucu
anlaşılmıştır. Vickers cihazı ile ölçülen borür sertlikleri 2000 HVN değerinin
üzerinde bulunmuştur. FeB, Fe₂B ve Fe₃B borürleri x-ışını
kırınım analizi ile teyit edilmiştir. Bor katmanı ve alaşım elementlerinin
dağılımı enerji ayrışma sistemli x-ışını spektroskopi (EDS) ile belirlenmiştir.

Keywords

Borlama, Hardox 400

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