INVESTIGATION OF WEAR BEHAVIOR OF BORONIZED AISI 316 STAINLESS STEEL

Abstract

   In this study, the wear behavior of boronized AISI 316 stainless steel was investigated. The chemical analysis of the sample to be used in the experiment was carried out with optical emission spectrometry before starting the boronizing experiment. Boronizing experiment using pack-boronizing method were carried out at 950°C for 3 hours. As the boron source, a powder mixture having the commercial name Ekabor 2 consisting of SiC, B₄C and KBF_4, was used. As a result of the boronizing treatment, the boride layer formed on the surface of AISI 316, morphologically by Scanning Electron Microscope (SEM-BEI), thickness by optical microscope integrated visual analyze system, hardness by Vickers indenter and chemical analysis by XRD (X-ray diffraction) device, were investigated. Then, friction tests were carried out to determine the wear resistance of the boride layer. As a result, it is determined that the boron layer formed on the surface of boronized AISI 316 stainless steel, consists of a double phase iron-boride layer.  This layer is a columnar morphology and homogeneous thickness. Also it has been determined to have ultra-hard and high wear resistance.

Keywords

• AISI 316 stainless steel,pack-boronizing,Ekabor 2,iron-boride layer,wear resistance

BORLANMIŞ AISI 316 PASLANMAZ ÇELİĞİN AŞINMA DAVRANIŞININ İNCELENMESİ

Öz

 

   Bu çalışmada borlanmış AISI 316 paslanmaz çeliğin aşınma davranışı incelenmiştir. Borlama işlemi öncesi, optik emisyon spektrometresi yardımıyla, deney numunesinin kimyasal analizi gerçekleştirilmiştir. Borlama deneyi, 950°C’de 3 saat süre ile kutu borlama yöntemi kullanılarak gerçekleştirilmiştir.   Borlayıcı olarak, SiC, B₄C and KBF₄’ den oluşmuş, ticari adı Ekabor 2 olan toz karışımı kullanılmıştır. Borlama işlemi sonucunda, AISI 316 paslanmaz çeliğin yüzeyinde oluşan borür tabakasının morfolojisi, tarama elektron mikroskobu (SEM-geri saçılan elektronlar), kalınlığı optik mikroskoba entegreli görüntü analiz sistemi, sertliği Vickers batıcı uç ile ve kimyasal analizi XRD (X-ışını difraksiyonu) cihazı ile gerçekleştirilmiştir. Daha sonra, borür tabakasının aşınma direncini belirlemek için, sürtünme testi gerçekleştirilmiştir. Sonuç olarak, borlanmış AISI 316 paslanmaz çeliğin yüzeyinde oluşan demir-borür tabakasının çift fazlı olduğu belirlenmiştir. Bu tabaka, kolonsal yapılı ve homojen kalınlıktadır. Ayrıca, çok sert ve yüksek aşınma direncine sahip olduğu belirlenmiştir.

Anahtar Kelimeler

• AISI 316 paslanmaz çelik,kutu borlama,Ekabor 2,demir-borür tabakası,aşınma direnci

Kaynakça

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