AISI 904L Süper Östenitik Paslanmaz Çeliğin Lazer Kaynak Kabiliyetinin Araştırılması

Öz

Bu çalışmada, lazer kaynak yöntemiyle birleştirilmiş AISI 904L süper östenitik paslanmaz çeliğin mikroyapı ve mekanik özellikleri araştırılmıştır. Elde edilen sonuçlara göre, en düşük ve en yüksek ısı girdisiyle birleştirilen numunelerin kaynak metali mikroyapısının neredeyse tamamen östenit (dendritik+interdendritik) tanelerinden oluştuğu gözlenmiştir. Isıl işlemin etkisiyle tane sınırlarında ve interdendritik bölgede bazı Cr23C6 ve Cr2N çökeltileri ortaya çıkmıştır. Ayrıca, ısı girdisinin artışına bağlı olarak dendritik yapının arttığı belirlenmiştir. En yüksek mekanik özellikler en düşük ısı girdisiyle birleştirilen numunede elde edilmiştir.

Anahtar Kelimeler

• Lazer kaynak
• Süper östenitik paslanmaz çelik
• Mikroyapı
• Mekanik özellikler
• Isıl işlem

Investigation of Laser Weldability of AISI 904L Super Austenitic Stainless Steel

Öz

In this study, the microstructure and mechanical properties of AISI 904L super austenitic stainless steel welded using laser beam were investigated. The results showed that the weld metal microstructure of samples joined at the lowest and highest heat inputs consisted almost entirely of austenite (dendritic + interdendritic) grains. Some Cr23C6 and Cr2N precipitates appeared at grain boundaries and in the interdendritic region due to heat treatment. It was also determined that the dendritic structure increased with increasing heat input. The highest mechanical properties were obtained in the sample joined at the lowest heat input.

Anahtar Kelimeler

• Laser welding
• Super austenitic stainless steel
• Microstructure
• Mechanical properties
• Heat treatment

Kaynakça

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