Diffusion characteristics of plasma nitrided hard chromium on AISI 1010 steel

Murat Danışman; Mustafa Kocabaş; Nurhan Cansever

doi:10.3139/120.110736

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Article

Diffusion characteristics of plasma nitrided hard chromium on AISI 1010 steel

Murat Danışman , Mustafa Kocabaş and Nurhan Cansever

Published/Copyright: April 21, 2015

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From the journal Materials Testing Volume 57 Issue 5

Abstract

In order to investigate the different Cr-N formation characteristics of plasma nitrided hard Cr coatings, Cr was electrodeposited on AISI 1010 steel and plasma nitrided at 600, 700 and 800 °C for 3 h, 5 h and 7 h, respectively. Phase analyses of resulting Cr-N phases and grain size of Cr layer before and after nitriding process were calculated by X-ray diffraction analysis. Structure of nitride layer and its thickness were analyzed using scanning electron microscopy micrographs. The micrographs indicated that samples consisted of three distinctive layers. In order to distinguish these layers, scanning electron microscopy and energy dispersive spectroscopy (EDX) analysis were used as well as elemental distribution versus depth was plotted. The Cr-N diffusion was investigated by layer thickness measurements, and diffusion coefficient as well as activation energies were calculated.

Kurzfassung

Um die verschiedenen Charakteristika der Cr-N-Bildung von plasmanitrierten Hartchromschichten zu untersuchen, wurde der Stahl AISI 1010 mit Chrom galvanisiert und bei 600, 700 bzw. 800 °C für 3 h, 5 h und 7 h plasmanitriert. Die Phasenanalyse der Cr-N-Phasen und die Korngröße der Chromschicht vor und nach dem Nitrierprozess wurden mittels Röntgendiffraktionsanalyse berechnet. Die Struktur der Nitridschicht und ihre Dicke wurden mittels Rasterlelektronenmikroskop analysiert. Die mikrostrukturellen Aufnahmen deuten darauf hin, dass die Proben aus drei verschiedenen Lagen bestehen. Um diese Lagen zu unterscheiden, wurden Rasterelektronenmikroskopie- und EDS-Analysen angewandt sowie die Elementverteilung über die Tiefe bestimmt. Die Cr-N-Diffusion wurde mit Schichtdickenmessungen untersucht und der Diffusionskoeffizient und die Aktivierungsenergien berechnet.

§Correspondence Address, Dr. Murat Danışman, Electronic Engineering Department, Faculty of Engineering, Gedik University, 34876 Yakacik, Istanbul, Turkey, E-mail: muratdan@gmail.com

Dr. Murat Danışman was born in 1977. After receiving his Bachelor's degree in Physics, he earned his MSc degree in Metallurgical and Materials Engineering in 2003. He holds a PhD in Metallurgical and Materials Engineering and is currently working as fulltime Assistant Professor Doctor in the Electrical and Electronic Engineering Department, Gedik University, Istanbul, Turkey. His research interests include materials science, surface engineering and semiconductor materials.

PhD candidate Mustafa Kocabaş, born in 1986, is currently working as Research Assistant at Yıldız Technical University, Istanbul, Turkey. His primary research interest is materials science, focusing on surface treatment. He began his PhD studies at Yıldız Technical University, Turkey, in 2012.

Prof. Dr. Nurhan Cansever, born in 1954, currently holds a full Professorship at Yıldız Technical University, Istanbul, Turkey. Her research focuses on corrosion, materials science and surface engineering.

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Published Online: 2015-04-21

Published in Print: 2015-04-30

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https://doi.org/10.3139/120.110736