Sıcak daldırma galvanizleme işleminin ıslah edilmiş ve edilmemiş AISI 4340 çeliğinin yorulma dayanımına etkisi

Bu çalışmada ıslah edilmemiş ve ıslah edilmiş AISI 4340 çeliğine uygulanan sıcak daldırma galvanizleme işleminin yorulma dayanımına etkisi incelenmiştir. Ayrıca galvaniz kaplamanın faz yapısı, fazların kalınlıkları ile yüzey sertlik ve pürüzlülük değerleri de çalışılmıştır. Galvanizleme sonrası, sıvı çinkonun yüksek yüzey gerilimi nedeniyle parçanın yüzey pürüzlülüğü azalması olumlu etki iken, çinkonun düşük sertliği nedeniyle yüzey sertliğinin azalması ve yorulma dayanımındaki düşüş olumsuz etkileridir. AISI 4340 çeliğine galvanizleme öncesi görmüş olduğu ıslah işlemlerinden bağımsız olarak, her iki grupta elde edilen yüzey sertlik, yüzey pürüzlülük, kaplama kalınlıkları ve kaplamayı oluşturan fazlar benzerdir. Galvanizleme sonrası yorulma dayanımındaki düşüş ıslah edilmiş, yüksek dayanımlı çelikte daha yüksek olsa da ıslah işleminin yorulma dayanımına olumlu katkısı halen devam etmektedir.

Anahtar Kelimeler:

Sıcak daldırma galvanizleme, Yorulma dayanımı, Galvaniz kaplama yapısı

The effect of hot dip galvanizing process on the fatigue properties of hot rolled and quenched-tempered AISI 4340 steel

In this study, the effects of hot dip galvanizing treatment on the fatigue strength of the hot rolled and quenched-tempered AISI 4340 steel were examined. The phase structure, phase thicknesses, surface hardness and roughness values of the galvanized coating were also examined. While the reduction in surface roughness of the part due to the high surface tension of the liquid zinc after galvanization has a positive effect, the decrease in the surface hardness due to the low hardness of the zinc and the decrease in the fatigue resistance are adversely affected. The surface hardness, surface roughness, coating thicknesses and the morphologies of constituent phases of coating obtained in both groups are similar, irrespective of the treatments seen before galvanizing the AISI 4340 steel. Although the decrease in fatigue strength after galvanization is higher in QT steel, the positive contribution to fatigue resistance of the quenched and tempered process still continues.

Keywords:

Hot dip galvanizing, Fatigue strength, Coating structure,

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