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

Year 2018, Volume: 24 Issue: 4, 626 - 634, 17.08.2018

Şule Yıldız Şirin

Abstract

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.

Keywords

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

Abstract

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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