Investigation of Weldability of 316L Austenitic Stainless Steel Produced by Powder Metallurgy Method

Öz

316L austenitic stainless steels were produced by powder metallurgy method at 600 MPa and 700 MPa pressing pressures in this study. The weldability of these steels was investigated by applying the resistance spot welding method. The microstructure of the welded sample was analyzed in detail with optical microscope. In addition, the hardness values of the base metal, heat-affected zone and weld metal regions formed as a result of resistance spot welding process were measured. Consequently, it was observed that the base metal microstructure was mainly composed of austenite phase. Due to the high heat occurring in resistance spot welding process, weld metal mainly consisted of delta ferrite phase in the austenite matrix. Hardness values increased from base metal to weld metal. Also, the hardness values measured in different welding regions of the sample obtained at 700 MPa pressing pressure were found to be higher than the sample obtained at 600 MPa pressing pressure.

Anahtar Kelimeler

• Powder Metallurgy
• 316L
• Resistance Spot Welding
• Microstructure
• Hardness

Toz Metalürjisi Yöntemi ile Üretilen 316L Östenitik Paslanmaz Çeliğin Kaynaklanabilirliğinin İncelenmesi

Öz

Bu çalışmada 600 MPa ve 700 MPa presleme basınçlarında toz metalürjisi yöntemi ile 316L östenitik paslanmaz çelikler üretilmiştir. Bu çeliklerin nokta direnç kaynak yöntemi uygulanarak kaynaklanabilirliği incelenmiştir. Kaynaklı numunenin mikroyapısı optik mikroskopta detaylı olarak analiz edilmiştir. Ayrıca nokta direnç kaynak işlemi sonucunda oluşan esas metal, ısının tesiri altındaki bölge ve kaynak metali bölgelerinin sertlik değerleri ölçülmüştür. Sonuç olarak, esas metal mikroyapısının ağırlıklı olarak östenit fazından oluştuğu görülmüştür. Nokta direnç kaynak işleminde meydana gelen yüksek ısı sebebiyle kaynak metalinin ağırlıklı olarak östenit matris içerisinde delta ferrit fazından oluştuğu gözlenmiştir. Esas metalden kaynak metaline doğru sertlik değerleri artış göstermiştir. Ayrıca 700 MPa presleme basıncında elde edilen numunenin farklı kaynak bölgelerinde ölçülen sertlik değerleri 600 MPa presleme basıncında elde edilen numuneye göre daha yüksek bulunmuştur.

Anahtar Kelimeler

• Toz metalürjisi
• 316L
• nokta direnç kaynağı
• mikroyapı
• sertlik

Kaynakça

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