Monel 400 Alaşımının Farklı Yük ve Hız Koşulları Altında Aşınma Davranışının Deneysel ve Sayısal İncelenmesi

Öz

Bu çalışmada, Monel 400 alaşımının farklı yük ve hız koşulları altındaki aşınma davranışı hem deneysel testler hem de sayısal simülasyonlar kullanılarak incelenmiştir. Aşınma testleri, sertliği ve aşındırıcılığı yüksek olan tungsten karbür (WC) bilyesi kullanılarak gerçekleştirilmiştir. Deneylerde, uygulanan yük ve hızın artmasıyla aşınma miktarında belirgin bir yükselme olduğu gözlenmiştir. Özellikle yüksek yüklerde, yüzeydeki malzeme kaybının hızlandığı ve temas yüzeyinde daha belirgin aşınma izlerinin oluştuğu tespit edilmiştir. Gerçekleştirilen simülasyonlar, Archard’ın aşınma yasasına dayalı olarak modellenmiş ve elde edilen deneysel verilerle doğrulanmıştır. Simülasyonla elde edilen sonuçlara göre aşındırıcı top yüzeyinde meydana gelen gerilme hız ve kuvvet arttıkça artmaktadır. Simülasyon sonuçları ile deneysel veriler arasında maksimum %12,30 hata oranı hesaplanmıştır ki bu, sonlu elemanlar modelinin aşınma tahminlerinde oldukça güvenilir olduğunu göstermektedir. Örneğin, 50 mm/s hızda yapılan aşınma testlerinde, yük 30 N’dan 50 N’a çıkarıldığında malzeme hacim kaybında %168,4’lük bir artış meydana gelmiştir. Bu bulgu, yükün aşınma mekanizmaları üzerindeki önemli etkisini ortaya koymaktadır. Yapılan çalışmalar, geliştirilen sonlu elemanlar modelinin aşınma deformasyonlarını hesaplamada başarılı olduğunu göstermektedir. Ayrıca, Monel 400’ün yüksek aşınma direncine sahip bir malzeme olduğunu ve özellikle aşınma direnci gerektiren uygulamalarda kullanılabileceğini destekleyen sonuçlar elde edilmiştir. Gelecekte yapılacak çalışmalar, farklı aşındırıcı malzemeler, değişen çevresel koşullar ve daha karmaşık yükleme senaryolarını içerecek şekilde genişletilebilir.

Anahtar Kelimeler

• Triboloji
• Aşınma
• Sürtünme
• Hacim kaybı

Experimental and Numerical Investigation of Wear Behavior of Monel 400 Alloy under Different Load and Speed Conditions

Öz

In this study, the wear behavior of Monel 400 alloy under different load and speed conditions was investigated using both experimental tests and numerical simulations. Wear tests were carried out using tungsten carbide (WC) ball with high hardness and abrasiveness. In the experiments, it was observed that there was a significant increase in the wear rate with the increase in applied load and speed. It was determined that especially at high loads, the material loss on the surface accelerated and more distinct wear marks were formed on the contact surface. The simulations performed were modeled based on Archard's wear law and verified with the experimental data obtained. According to the results obtained by simulation, the stress on the abrasive ball surface increases as speed and force increase. A maximum error rate of 12.30% was calculated between the simulation results and the experimental data, which shows that the finite element model is quite reliable in wear predictions. For example, in the wear tests carried out at a speed of 50 mm/s, a 168.4% increase in material volume loss occurred when the load was increased from 30 N to 50 N. This finding reveals the significant effect of the load on wear mechanisms. The studies show that the developed finite element model is successful in calculating wear deformations. In addition, results supporting that Monel 400 is a material with high wear resistance and can be used in applications requiring wear resistance in particular have been obtained. Future studies can be expanded to include different abrasive materials, changing environmental conditions and more complex loading scenarios.

Anahtar Kelimeler

• Tribology
• Wear
• Friction
• Volume loss

Kaynakça

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