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Licensed Unlicensed Requires Authentication Published by De Gruyter October 1, 2014

Effect of Boronizing on the Deformation Behaviour of a H320LA Sheet Steel

Auswirkungen des Borierens auf das Verformungsverhalten eines H320LA-Stahlblechs
Adnan Calik, Ali Kemal Yakut, Mustafa Serdar Karakas and Nazim Ucar
From the journal Materials Testing

Abstract

The effect of boronizing on commercial H320LA steel sheets of 1 mm and 2 mm thickness was evaluated. The boronizing treatments were carried out in a solid medium at 1173 K for 5 h using the powder pack method. The boride layers formed on the surface were characterized and microhardness measurements were conducted on the borides and the substrate. Mechanical properties and deformation behaviour were compared by bending, tensile, deep drawing, and ballistic tests. The ballistic behaviour was investigated impacting against lead alloy core projectiles of 358 ± 12 m/s velocity at normal impact angle. The microhardness of the boride layers was approximately 1225–1455 HV0.1. Bend tests revealed a sharp decrease in flexural strengths of the boronized specimens. Deep drawability was impaired, while ballistic properties of the plates were improved with boronizing treatment due to improved surface hardness.

Kurzfassung

Der Effekt des Borierens auf kommerzielle H320LA-Stahlbleche mit einer Dicke von 1 mm und 2 mm wurde bestimmt. Die Borierbehandlungen wurden in einem festen Medium bei 1173 K über fünf Stunden mittels Pulverbettverfahren ausgeführt. Die Boridschichten auf der Oberfläche wurden charakterisiert und Mikrohärteprüfungen an den Boriden und dem Substrat durchgeführt. Die mechanischen Eigenschaften und das Verformungsverhalten wurde durch Biege-, Zug- und Tiefziehversuche sowie ballistische Tests verglichen. Das ballistische Verhalten wurde untersucht, indem der Impaktwiderstand gegen Bleikernprojektile mit einer Geschwindigkeit von 358 ± 12 m/s unter normalem Auftreffwinkel bestimmt wurde. Die Mikrohärte der Boridschichten betrug etwa 1225 HV0.1 bis 1455 HV0.1. Die Biegeversuche ergaben einen steilen Abfall der Biegefestigkeit bei den borierten Proben. Die Tiefziehfähigkeit wurde beeinträchtigt während die ballistischen Eigenschaften des Blechs durch die Borierbehandlung infolge der verbesserten Oberflächenhärte verbessert wurden.


* Correspondence Address, A. Calik, Suleyman Demirel University, Faculty of Technology, Manufacturing Engineering Department, 32260, Isparta, Turkey, E-Mail:

Adnan Calik was born 1974 in Osmaniye, Turkey, received his BSc in 1994 at the University of Firat, Faculty of Technical Education, Metallurgy Department, Elazığ, Turkey and the MSc in 1997 at the University of Firat, Graduate School of Natural and Applied Sciences, Metallurgy Department, Elazig, Turkey. He achieved his PhD in 2004 at the Suleyman Demirel University, Graduate School of Natural and Applied Sciences, Mechanical Engineering Department, Isparta, Turkey. He is currently at the Suleyman Demirel University, Isparta, Turkey in the research areas boronizing, mechanical metallurgy, welding techniques, solid state welding, welding metallurgy, manufacturing techniques, and heat treatment of welding.

Ali Kemal Yakut was born in 1956 in Trabzon, Turkey, received the BSc in 1978 at the Karadeniz Technical University, Faculty of Mechanical and Electrical Engineering, Mechanical Engineering Department, Trabzon, Turkey and the MSc in 1984 at the Dokuz Eylul University, Graduate School of Natural and Applied Sciences, Mechanical Engineering Department, Izmir, Turkey. In 1987, he achieved his PhD at the Istanbul Technical University, Graduate School of Natural and Applied Sciences, Mechanical Engineering Department, Istanbul, Turkey. He is currently at the Suleyman Demirel University, Isparta, Turkey in the research areas heat and mass transfer, fuels and combustion, and energy.

Mustafa Serdar Karakas was born in 1977 in Ankara, Turkey, received the BSc in 1999 at Istanbul University, Faculty of Engineering, Metallurgical Engineering Department, Istanbul, Turkey and the MSc in 2001 at the Istanbul Technical University, Graduate School of Natural and Applied Sciences, Metallurgical and Materials Engineering Department, Istanbul, Turkey. He achieved his PhD in 2007 at the Middle East Technical University, Graduate School of Natural and Applied Sciences, Metallurgical and Materials Engineering Department, Ankara, Turkey. He is currently at the Suleyman Demirel University, Isparta, Turkey and works in the research areas composite materials, mechanical metallurgy, powder metallurgy and coatings.

Nazim Ucar was born in 1958 in Isparta, Turkey, received the BSc in 1982 at Hacettepe University, Faculty of Engineering, Physics Engineering Department in Ankara, Turkey and the MSc in 1987 at the Ataturk University, Graduate School of Natural and Applied Sciences, Physics Department, Erzurum, Turkey. The PhD was achieved in 1991 at the Ataturk University, Graduate School of Natural and Applied Sciences, Physics Department, Erzurum, Turkey. He is currently working at the Suleyman Demirel University, Isparta, Turkey in the research area mechanical and electrical properties of metals and schottky diodes.


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Published Online: 2014-10-01
Published in Print: 2014-03-03

© 2014, Carl Hanser Verlag, München

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