Effect of Energy Input on Microstructural and Tribological Properties of WC Composite Coatings Produced by Plasma Transfer Arc (PTA) Method

Öz

In this study, surface modification with tungsten carbide (WC) powder was applied on 1.2842 cold work tool steel using 3 different energy inputs by plasma transfer arc (PTA) method. Energy inputs were performed with different current values and feed rates during the process. Microstructure properties of the samples were determined by optical microscope, SEM, EDS and XRD analysis. Friction and wear properties were determined with pin-disk wear test method according to ASTM-G99 standard. Worn surfaces were examined by SEM and EDS analysis and wear mechanisms were determined. Hard carbide structures such as WC, Fe3W3C and Fe7C3 were formed in the interdendritic regions of the modified samples. The size of the interdendritic regions changed with the effect of energy inputs. Since the low energy input did not fully decompose the WC powder, it produced less W content carbide in the interdendritic regions. As a result of experimental studies, 0.9 kJ / mm was determined as the optimum energy input. The hardness was increased approximately 5 times and the wear rate was reduced up to 7 times in WC coatings due to the formed hard carbide phases. The main wear mechanism of WC coatings was abrasive and oxidative wear.

Anahtar Kelimeler

• PTA surface modification,Heat input,Tungsten carbide,Friction and wear

Plazma Transferli Ark (PTA) Yöntemi ile Üretilen WC Kompozit Kaplamalarda Enerji Girdisinin Mikroyapısal ve Tribolojik Özelliklere Etkisi

Öz

Bu çalışmada, plazma transferli ark (PTA) yöntemi ile 3 farklı enerji girdisi kullanılarak 1.2842 soğuk iş takım çeliği üzerinde tungsten karbür (WC) tozu ile yüzey modifikasyon işlemi uygulanmıştır. Enerji girdileri işlem sırasında farklı akım değerleri ve ilerleme hızları kullanılarak gerçekleştirilmiştir. Numunelerin mikroyapı özellikleri optik mikroskop, SEM, EDS ve XRD analizleri ile belirlenmiştir. Sürtünme ve aşınma özellikleri pim-disk aşınma test yöntemi kullanılarak ASTM-G99 standartlarına göre belirlenmiştir. Aşınan yüzeyler SEM ve EDS analizleri ile incelenerek aşınma mekanizmaları tespit edilmiştir. Yüzeyi alaşımlandırılmış numunelerin interdendritik bölgelerinde WC, Fe3W3C ve Fe7C3 gibi sert karbür yapıları oluşmuştur. Enerji girdilerinin etkisiyle interdendritik bölgelerin büyüklüğü değişmiştir. Düşük enerji girdisi WC tozunun tam olarak ayrışmasını sağlamadığı için interdendritik bölgelerde daha az W içerikli karbür oluşturmuştur. Deneysel çalışmalar sonucunda optimum enerji girdisi olarak 0.9 kJ/mm belirlenmiştir. WC kaplamalarda oluşan sert karbür fazlarının etkiyle sertlik yaklaşık 5 kat artmış ve aşınma oranı yaklaşık 7 kata kadar azalmıştır. WC kaplamaların ana aşınma mekanizması abrasif ve oksidatif aşınma olmuştur.

Anahtar Kelimeler

• PTA yüzey modifikasyonu,Isı girdisi,Tungsten karbür,Sürtünme ve aşınma

Kaynakça

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