Suni Yüzey Kusuru İçeren 50CrV4 Çeliğinin Yorulma Dayanımı Bilyalı Dövme Prosesinin Etkileri

Yıl 2024, Cilt: 27 Sayı: 3, 1161 - 1167, 25.07.2024

Fatih Barış , Nurşen Saklakoğlu , Simge İrizalp

https://doi.org/10.2339/politeknik.1099953

Öz

Yüzey kusurlarının mühendislik malzemeleri üzerinde çok önemli bir etkisi olduğu iyi bilinmektedir. Bilyalı dövme prosesi yüzey özelliklerini ve yorulma dayanımını iyileştiren mekanik bir yüzey işlemidir. Bu çalışmada 50CrV4 yay çeliğinin yorulma mukavemetine yüzey kusurlarının ve bilyalı dövme prosesinin etkilerinin araştırılması amaçlanmıştır. Numune boyunca yarım daire şeklinde 0,2 mm derinliğinde çizik ve 3 mm çapında delik içeren numuneler S230 çelik bilyalar ile dövülmüştür. Kusur içeren ve içermeyen numunelere 3-nokta eğme yorulma testleri gerçekleştirilmiştir. Kusurlar çatlak gibi davranmış ve delik veya yarım-daire çizik içeren numunelerin yorulma mukavemetini sırasıyla (672 MPa için) %85 ve %80 oranında azaltmıştır. Bilyalı dövme çizik içeren numunenin yorulma mukavemetini %126 arttırırken, delik içeren numune üzerinde hemen hemen hiçbir etkisi olmamıştır. Bilyalı dövme çizik içeren numunenin yorulma mukavemetini arttırmasına rağmen, kusurlu numunenin yorulma mukavemetine ulaşamamıştır. Bu sonuçlara dayanarak, bilyalı dövme yöntemi ile 3 mm delik ve 0,2 mm çizik kusurlarının tamamen zararsız hale getirilemeyeceği sonucuna varılabilir.

Anahtar Kelimeler

Bilyalı dövme, suni yüzey kusuru, yorulma

Destekleyen Kurum

Manisa Celal Bayar Üniversitesi BAP Koordinasyon Birimi

Proje Numarası

2018-039

Teşekkür

Bu çalışma Manisa Celal Bayar Üniversitesi BAP Koordinasyon Birimi tarafından desteklenmiştir (Proje kodu:2018-039). Yazarlar Dönmez Debriyaj (İzmir) firmasına numunelerin hazırlanmasına katkılarında dolayı teşekkür eder.

Effects of Shot Peening Process on Fatigue Strength of 50CrV4 Steel Contaning an Artifical Surface Defect

Öz

It is well known that surface defects have a very significant effect on the fatigue strength of engineering materials. The shot peening process is a mechanical surface treatment to enhance surface properties and fatigue strength. In this study, it is aimed to investigate the effects of surface defects on the fatigue strength of 50CrV4 spring steel and the effect of shot peening process effects. Samples including a semicircular slit sized 0,2 mm or a hole sized 3 mm throughout the sample were shot-peened by S230 steel balls. 3-point bending tests were performed on defected and non-defected samples. It was found that the defects acted as a pre-existent crack and samples with hole and semicircular slit significantly reduced the fatigue strength by 85% and 80% (for 672 MPa), respectively. While shot peening enhanced the fatigue strength of the semi-circular slitted sample by 126%, it had almost no effect on the holed sample. Although shot peening increased the fatigue strength of the semi-circular slotted sample, it could not reach that of the non-defected sample. According to the results, it can be concluded that 3 mm hole and 0,2 mm scratch defects cannot be made harmless by the Shot Peening method.

Anahtar Kelimeler

Shot peening, artifical surface defect, fatigue

Proje Numarası

2018-039

Kaynakça

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