Gökçe Mehmet GENÇER, Coşkun YOLCU, Fatih KAHRAMAN, Melih BELEVİ

SiCP/A356 Kompozitinin Aşınma Direncine Ultrasonik Dövme İşleminin ve Yaşlandırma Sertleşmesinin Etkilerinin Karşılaştırılması

Çalışmada, karıştırmalı döküm yöntemiyle üretilmiş ağırlıkça %10 SiC partikül takviyeli alüminyum matrisli kompozit plakalara 2 ve 5 saat olmak üzere iki farklı yaşlandırma süresi kullanılarak T6 ısıl işlemi uygulanmıştır. Buna ilaveten, döküm sonrası elde edilen bir diğer kompozit plakaya ise ultrasonik dövme yöntemi uygulanmıştır. Matris malzemesi olarak A356 alaşımı kullanılan kompozit plakaların, uygulanan işlemler sonrasında iç yapılarındaki ve sertlik değerlerindeki değişimler ve bulamaç (çamur) ortamındaki abrasif aşınma davranışları incelenmiştir. Sonuçlara göre, uygulanan ısıl işlemin ve ultrasonik dövme yönteminin SiC partikül takviyeli A356 kompozitin bulamaç ortamındaki abrasif aşınma direncini arttırdıkları ancak imalat sırasında takviyeler nedeniyle mikro hataların oluşması halinde, seramik takviyelerin sağladığı aşınma direncini yine kendilerinin negatif etkileyebileceği de gözlemlenmiştir.

Anahtar Kelimeler:

Silisyum karbür, ultrasonik dövme yöntemi, karıştırmalı döküm, T6 ısıl işlemi

Comparison Of The Effects Of Ultrasonic Impact Treatment And Age Hardening On Wear Resistance Of SiCp/A356 Composite

In the study, 10 wt.% SiC reinforced aluminum matrix composite plates fabricated by stir casting method were T6 heat treated by using two different artificial aging times as 2 and 5 hours. Furthermore, post-casting ultrasonic impact treatment was applied to the other obtained composite plate. The changes in the microstructures and hardness values and slurry wear behaviors of the composite plates which A356 alloy was used as matrix material were investigated. According to the results, the applied heat treatment and ultrasonic impact treatment improved the slurry abrasive wear resistances of the SiC reinforced A356 composite. However, during the composite fabrication process, in the condition of micro discontinuity formation due to the reinforcements; it was observed that the wear resistance ensured by ceramic reinforcements can be adversely affected again by reinforcements.

Keywords:

Silicon carbide, ultrasonic impact treatment, stir casting, T6 heat treatment,

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