B içeriğinin Fe esaslı in situ TiC-TiB2 sert dolgu kaplamalarının mikroyapısı ve sertliği üzerindeki etkileri

Öz

Bu çalışmada, tungsten inert gaz (TIG) kaynak yöntemi kullanılarak DIN St37 çelik levha yüzeyinde farklı oranlarda Fe-Cr-Ti-(B,C) esaslı sert dolgu kaplamaları üretilmiştir. Artan bor içeriğinin kaplamada in situ oluşması beklenen TiC-TiB2 fazlarının morfolojisini nasıl etkilediği araştırılmıştır. Ayrıca mikroyapıdaki bu değişikliklerin sert dolgu kaplamalarının mikrosertliği üzerindeki etkileri de incelenmiştir. X-ışını analizleri, %10 B içeriğine sahip kaplamalarda α-(Fe, Cr), M2B, TiC ve M7C3 gibi fazların oluştuğunu, %20 ve %30 bor içeriğine sahip kaplamalarda ise bu fazların yanısıra TiB2 fazının da tespit edildiğini ortaya koydu. Ayrıca kaplama mikroyapılarında TiB2 fazının hacim fraksiyon oranının arttığı ve çubuksu bir yapı olarak sentezlendiği tespit edilmiştir. Buna bağlı olarak sert dolgu kaplamalarının mikrosertlik değerleri önemli ölçüde artmıştır. Bulunan en yüksek mikrosertlik 1045 HV0.2 ile 30B-Ti bileşiminden üretilen kaplama içindir ve bu değer altlık çelikten (234 HV0.2) yaklaşık 4.5 kat daha yüksektir.

Anahtar Kelimeler

• In situ
• TiC-TiB2
• Sert dolgu
• yüzey alaşımlama
• sertlik
• aşınma

The Influence of B Content on the Microstructure and Hardness of in Situ Formed TiC-TiB2 Reinforced Fe-Based Hardfacing Coatings

Abstract

In this study, Fe-Cr-Ti-(B, C) based hardfacing coatings with different ratios were produced on DIN St37 steel plate surface using tungsten inert gas (TIG) welding method. It was investigated how increasing boron content affects the morphology of in situ TiC-TiB2 phases expected to form in situ in the coating. The effects of these changes in microstructure on the microhardness of the hardfacing coatings were also determined. X-ray analyses revealed that phases such as α-(Fe, Cr), M2B, TiC, and M7C3 were formed in coatings with 10% B content, and TiB2 phase was also detected in coatings with 20% and 30% boron content. In addition, it was determined that the volume fraction ratio of TiB2 phase increased in the coating microstructures and it was synthesised as a rod-like structure. Accordingly, the microhardness values of the hardfacing coatings increased significantly. The highest microhardness found was 1045 HV0.2 for the coating produced from 30B-Ti composition, which is about 4.5 times higher than the base steel (234 HV0.2).

Keywords

• In situ
• TiC-TiB2
• Hardfacing
• surface alloying
• hardness
• wear

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