Effect of Temper Rolling Reduction Ratio on Microhardness and Microstructure of DC04 Grade Sheet Material

Year 2022, Volume: 11 Issue: 2, 393 - 399, 30.06.2022

Batuhan Özakın , Naci Kurgan

https://doi.org/10.17798/bitlisfen.956944

Cited By: 2

Abstract

With temper rolling, which is the final stage of the cold rolling manufacturing process, to the surface of sheet metal materials is transferred roughness with specially roughened rolls. In this study, microhardness and microstructural evolution occurring in the section along the thickness of DC04 grade sheet materials temper rolled with various reduction ratios were investigated. As a result, it was concluded that the microhardness distribution taken from the section along the thickness increases with the increase of reduction ratio and the microhardness distribution from the surface to the center in the section decreases. In the temper rolling process with a reduction ratio of 250 µm and 500 µm an increase of approximately 5% and 15% has occurred, respectively compared to before the temper rolling process. It was also concluded that with the increase in reduction ratio, the grains in the section along the thickness elongated and thinned on the surface and this change in the center compared to the regions close to the surface was less.

Keywords

Temper Rolling (Skin-Pass Rolling), Reduction Ratio, Microhardness, Microstructure, DC04 Grade Sheet Materials

Supporting Institution

Ondokuz Mayıs Üniversitesi, TUBİTAK(2211-C)

Project Number

PYO.MUH.1904.19.013

Thanks

The authors thank for the support provided by Ondokuz Mayıs University [PYO. MUH.1904.19.013] the project number and [TÜBİTAK 2211-C], the laboratory support of "Faculty of Technology of Karabük University" and the material donations of "Ereğli Iron and Steel Factories".

DC04 Kalite Sac Malzemenin Mikrosertlik ve Mikroyapısına Temper Haddeleme Ezme Miktarının Etkisi

Abstract

Soğuk haddeleme imalat prosesinin son aşaması olan temper haddeleme ile metal sac malzemelerin yüzeyine pürüzlülük, özel pürüzlendirilmiş merdaneler ile aktarılır. Bu çalışmada, farklı ezme miktarlarıyla haddelenmiş DC04 kalite sac metal malzemelerin, kalınlıkları boyunca kesitte meydana gelen mikrosertlik ve mikroyapısal değişim incelenmiştir. Sonuç olarak, kalınlık boyunca kesitten alınan mikrosertlik dağılımının ezme miktarının artmasıyla birlikte arttığı ve kesitte yüzeyden merkeze doğru mikrosertlik dağılımının azaldığı sonucuna varılmıştır. 250 µm ve 500 µm küçültme oranına sahip temper haddeleme işleminde, temper haddeleme işlemi öncesine göre sırasıyla yaklaşık %5 ve %15'lik bir artış meydana gelmiştir. Ayrıca ezme miktarının artmasıyla birlikte kalınlık boyunca kesitteki tanelerin yüzeyde uzayıp inceldiği ve merkezdeki bu değişimin yüzeye yakın bölgelere göre daha az olduğu sonucuna ulaşılmıştır.

Keywords

Temper Haddeleme, Ezme Miktarı, Mikrosertlik, Mikroyapı, DC04 Kalite Sac Malzemeler

Project Number

PYO.MUH.1904.19.013

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