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Mechanical Properties of Pattern Welded 1075-15N20 Steels*

  • Furkan Özkan , Hakan Kirdan , İsmail Hakkı Kara , Fazıl Hüsem , Sait Özcelik , Yüksel Akinay , Harun Çug , Yavuz Sun und Hayrettin Ahlatci
Veröffentlicht/Copyright: 11. Oktober 2014
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Abstract

Forged welded (damascus) steels are produced by traditional methods and mostly used in the design of decorative tools. These steels are well-known for their good mechanical properties. The process for making forged welded (damascus) steel consists of stacking alternating sheets of different kinds of steel on top of each other and then forge welding them together. In this study, the steels 1075 and 15N20 were used for the forging and folding procedure. The effect of fold numbers on the microstructure and mechanical behavior were investigated. The steel consisted of both materials, 54 and 250 layers, respectively, produced by forge welding. The pattern layers are homogeneous and regular, but after the process sections with up to 54 pattern layers were irregular. Steel 1075 has a pearlitic microstructure, while steel 15N20 has a ferritic microstructure. The impact toughness and tensile strength of the folded steels improved with increasing the number of folds.

Kurzfassung

Schmiedegeschweißte Damaszener Stähle werden nach traditionellen Verfahren hergestellt und überwiegend für die Herstellung dekorativer Werkzeuge genutzt. Diese Stähle sind sehr bekannt für ihre guten mechanischen Eigenschaften. Der Prozess für die Herstellung von Schmiedeschweißungen bzw. Damaszener Stählen besteht aus dem Aufeinanderstapeln verschiedener Bleche unterschiedlicher Art und dem anschließenden Zusammenschmiedeschweißen. Für die diesem Beitrag zugrunde liegende Studie wurden die Stähle 1075 und 15N20 für den entsprechenden Schmied- und Faltprozess verwendet. Es wurden die Auswirkungen der Anzahl der Faltungen auf die Mikrostruktur und das mechanische Verhalten untersucht. Der so entstandene Stahl bestand aus beiden Materialien, 54 bzw. 250 Lagen, die durch Schmiedeschweißen hergestellt wurden. Die Musterlagen waren homogen und gleichmäßig verteilt, aber nach dem Schmiedeschweißen gab es Bereiche mit bis zu 54 Lagen, die ungleichmäßig waren. Der gefaltete Stahl 1075 hat eine perlitische Mikrostruktur, während der Stahl 15N20 ein ferritisches Gefüge aufweist. Die Kerbschlagzähigkeit und die Zugfestigkeit der gefalteten Stähle verbesserte sich mit zunehmender Anzahl von Faltungen.


**Correspondence Address Assoc. Prof. Dr. Hayrettin Ahlatci, Karabuk University, Department of Metallurgical and Materials Engineering, Karabuk, Turkey, E-mail:

Furkan Özkan is a student at Karabuk University, Turkey, and working on his Bachelor degree in the Department of Metallurgical and Material Engineering.

Hakan Kirdan is a student at Karabuk University, Turkey, and working on his Bachelor degree in the Department of Metallurgical and Material Engineering.

İsmail Hakkı Kara is a research assistant at Karabuk University, Turkey. He obtained his Bachelor's degree from the Department of Metallurgical and Material Engineering, Yıldız Technical University, Istanbul, Turkey, in 2012. Currently, he is a MSc student at Karabuk University. His research interests include welding technology, P91 and P92 steels, microstructure characterization, SEM, microscopy as well as composite materials.

Fazıl Hüsem is a research assistant at Karabuk University, Turkey. He obtained his Bachelor's degree from the Department of Metallurgical and Material Engineering, Yıldız Technical University, Istanbul, Turkey, in 2010 and then acquired his MSc from the Institute of Science at the same university. Currently, he is a PhD student at Karabuk University. His research interests include welding technology, microstructure characterization, mechanical testing of materials, plaster of paris as well as nondestructive inspection.

Sait Özcelik is a research assistant at Karabuk University, Turkey. He obtained his Bachelor's degree from the Department of Metallurgical and Material Engineering, Yıldız Technical University, Istanbul, Turkey, in 2011. He then obtained a Master's degree from the Department of Materials Engineering at the same university His research interests include head hardened train rails, fatigue behavior of materials as well as NDT.

Yüksel Akinay is a research assistant at Karabuk University, Turkey. He obtained his Bachelor's degree from the Department of Metallurgical and Material Engineering, Yıldız Technical University, Istanbul, Turkey, in 2010. Currently, he is a MSc student at Karabuk University. His research interests include welding technology, automotive steels, microstructure characterization and microscopy as well as composite materials.

Harun Çug, born 1981, is a research assistant at Karabuk University. He is currently a PhD student in the Department of Metallurgical and Material Engineering of that university. His research interests include welding technology, casting technology, train rail and train wheel steel, heat treatment as well as composite materials.

Assoc. Prof. Dr. Yavuz Sun, born 1973, received his BSc, MSc and PhD degrees from the Department of Metallurgical and Materials Engineering, Istanbul Technical University, Istanbul, Turkey. Currently, he is Associate Professor in the Department of Metallurgical and Materials Engineering, Faculty of Engineering, Karabuk University, Turkey. His research areas are mechanical and wear behavior of high Cr-Ni cast steels and aluminum alloys.

Assoc. Prof. Dr. Hayrettin Ahlatci, born 1969 in Karabuk, obtained his Bachelor's degree from the Department of Metallurgical and Material Engineering, Istanbul Technical University (ITU), Turkey, in 1994. He started his academic career as a research assistant at Karaelmas University in Zonguldak, Turkey. He completed his MSc and PhD degrees at the Institute of Science at ITU. Presently, he is Associate Professor in the Department of Metallurgical and Materials Engineering, Faculty of Engineering, Karabuk University, Turkey.

*

Presented during the 3rd International Conference on Welding Technologies and Exhibition (ICWET'14) in Manisa, Turkey


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Published Online: 2014-10-11
Published in Print: 2014-10-01

© 2014, Carl Hanser Verlag, München

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