Effect of Heat Treatment at Different Temperatures on The Structural and Tribological Properties of Electroless Ni-B Coated 32CrMoV12-10 Alloy

Öz

In this article, Ni-B (nickel-boron) plating process was performed on 32CrMoV12-10 barrel material, which is widely used in the defense industry and produced by forging method, by electroless plating method in aqueous solution prepared in a bath. The coated samples were then heating process at 250, 300, 350 and 400C temperatures. The effects of these heat treatments on tribological and microstructural properties were investigated. Cauliflower-like surface structure was formed on all coated samples. In XRD analysis, it was observed that an amorphous structure was formed in the sample heating processat 250°C in argon environment. The highest hardness was measured on the surface of the sample heating processat 350°C in argon environment, while the lowest hardness was measured on the surface of the sample with amorphous structure and heating process at 250°C in argon environment. It was observed that there was a notable increase in the wear endurance of the samples heating process at 300°C, 350°C and 400°C in argon environment. It was concluded that heat treatment in an open atmosphere causes oxidation at the steel interface, which prevents the diffusion of nickel into the steel in the plating process. The surface roughness of the sample heating process at 250°C in an amorphous argon atmosphere was higher than all other samples. The best surface roughness value was obtained at the argon atmosphere 350°C treatment conditions. When all the data supporting each other are brought together, it is determined that the most suitable heat treatment temperature is at 350°C in argon atmosphere instead of high temperature heat treatment after Ni-B plating process on an industrial scale.

Anahtar Kelimeler

• 32CrMoV12-10 alloy
• Electroless plating
• Nickel-Boron coating
• Heat treatment
• Mechanical properties
• Tribology

Farklı Sıcaklıklardaki Isıl İşlemin Akımsız Ni-B Kaplamalı 32CrMoV12-10 Alaşımının Yapısal Ve Tribolojik Özelliklerine Etkisi

Öz

Bu çalışmada, savunma sanayinde yaygın olarak kullanılan ve dövme yöntemi ile üretilen 32CrMoV12-10 namlu malzemesine, banyo içerisinde hazırlanan sulu çözeltide akımsız kaplama yöntemi ile nikel-bor (Ni-B) kaplama işlemi gerçekleştirilmiştir. Kaplanan numuneler daha sonra farklı sıcaklıklarda ısıl işleme tabi tutulmuştur. Bu ısıl işlemlerin tribolojik ve mikro yapısal özellikler üzerine etkileri incelenmiştir. Tüm kaplanan numunelerde karnabahar benzeri yüzey yapısı oluşmuştur. XRD analizi, argon atmosferinde 250°C'de ısıl işlem uygulanan numunenin yapısının amorf olduğunu göstermiştir. En yüksek sertlik değeri argon atmosferinde 350°C'de ısıl işlem uygulanan numunede, en düşük sertlik ise amorf yapıya sahip argon atmosferinde 250°C'de ısıl işlem uygulanan numunede ölçülmüştür. Argon atmosferinde 300, 350 ve 400°C'de ısıl işlem uygulanan numunelerin aşınma dirençlerinin önemli ölçüde iyileştiği görülmüştür. Açık atmosferde ısıl işlemin çelik ara yüzeyinde oksidasyona neden olduğu ve bu durumun kaplama işleminde nikelin çeliğe difüzyonunu engellediği sonucuna varılmıştır. Amorf argon atmosferinde 250°C'de ısıl işleme tabi tutulan numunenin yüzey pürüzlülüğü diğer tüm numunelerden daha yüksek bulunmuştur. En iyi yüzey pürüzlülük değeri argon atmosferinde 350°C işlem koşullarında elde edilmiştir. Birbirini destekleyen tüm veriler bir araya getirildiğinde endüstriyel ölçekte nikel-bor (Ni-B) kaplama işleminden sonra yüksek sıcaklık ısıl işlemi yerine argon atmosferinde 350°C'de en uygun ısıl işlem sıcaklığının olduğu belirlenmiştir.

Anahtar Kelimeler

• 32CrMoV12-10 alaşımı
• Akımsız kaplama
• Nikel-Bor kaplama
• Isıl işlem
• Mekanik özellikler
• Triboloji

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