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Licensed Unlicensed Requires Authentication Published by De Gruyter May 26, 2013

Microstructure and Microhardness Characterization of Cr3 C2 -SiC Coatings Produced by the Plasma Transferred Arc Method

Charakterisierung der Mikrostruktur und Mikrohärte von Cr3C2-SiC PTA-Beschichtungen
  • Serkan Islak , Özkan Eski , Soner Buytoz , Muzaffer Karagöz and Joseph Stokes
From the journal Materials Testing

Abstract

The purpose of this work was to investigate the coatings made of Cr3 C2 and SiC powder manufactured on AISI 304 stainless steel applied by the plasma transferred arc (PTA) welding process. SiC content in the produced coated layer was varied between 0–100 wt.% and the effect of SiC concentration on the microstructure and hardness of the coating was measured experimentally. SEM analyses revealed that the composite coatings had a homogeneous, nonporous, and crack-free microstructure. Dendrites and interdendrite eutectics formed on the coating layer, subject to the temperature gradient and the solidification ratio. There was a significant increase in the hardness of coating layers with the effect of the γ -(Fe,Ni), Cr7 C3, Cr23 C6, Fe5 C2, Cr3 Si, CrSi2, Fe>0.64 Ni0.36, CFe15.1, C-(Fe,Cr)-Si phases formed in the microstructure. In comparison to the substrate, the microhardness of the coatings produced by PTA were 2.5–3.5 times harder.

Kurzfassung

Das Ziel der hier beschriebenen Arbeiten bestand darin die Cr3C2- und SiC-Pulverbeschichtungen zu untersuchen, die mittels eines Plasmalichtbogenprozesses auf Stahl AISI 304 aufgebracht wurden. Der SiC-Gehalt der so produzierten Schicht wurde zwischen 0 wt.-% und 100 wt.-% variiert und der Effekt der SiC-Konzentration auf die Mikrostruktur und Härte der Beschichtungen wurde experimentell bestimmt. Mittels REM-Untersuchungen wurde ermittelt, dass die Kompositbeschichtungen eine homogene, porenfreie und rissfreie Mikrostruktur aufwiesen. Dendrit- und Interdendrit-Eutektika bildeten sich auf der Schicht abhängig vom Verhältnis aus Temperaturgradienten und Erstarrungsgeschwindigkeit. Es konnte ein signifikanter Härteanstieg in den Schichten aufgrund des Effektes der in der Mikrostruktur gebildeten Phasen γ′-(Fe,Ni), Cr7C3, Cr23C6, Fe5C2, Cr3Si, CrSi2, Fe0.64Ni0.36, CFe15.1, C-(Fe,Cr)-Si festgestellt werden. Im Vergleich zum Substrat war die Mikrohärte in den mit PTA produzierten Schichten 2,5–3,5 mal härter.


Dr. Serkan Islak graduated from Metallurgy Education Department in Firat University, Elazig, Turkey, in 2002. He holds M.Sc. and Ph.D. at Firat University, Elazig, in 2005 and 2012, respectively. He is instructor at the Cide Rifat Ilgaz Vocational High School, Welding Technology Department of Kastamonu University, Kastamonu, Turkey. His main interests include powder metallurgy and surface coating technologies.

Dr. Ozkan Eski graduated from Mechanical Engineering Department in Istanbul Technical University, Istanbul, Turkey, in 1989. He holds M.Sc. and Ph.D. at Istanbul Technical University, Istanbul, in 1993 and 2001, respectively. He is assistant professor at Kastamonu Vocational High School, Mechanical Department of Kastamonu University, Kastamonu, Turkey. His main interests include welding technologies.

Dr. Soner Buytoz graduated from Mechanical Engineering in Firat University, Elazig, Turkey, in 1996. He holds M.Sc. and Ph.D. at Firat University, Elazig, in 1999 and 2004, respectively. He is assistant professor at the Department of Metallurgy and Materials Engineering, Technology Faculty, Firat University, Elazig, Turkey. His main interests include surface coating and abrasion wear of materials, composite materials and their mechanical behaviour as well as corrosion.

Muzaffer Karagoz graduated from Mechanical Engineering in Eskisehir Osmangazi University, Eskisehir, Turkey, in 2005. He holds M.Sc. at Eskisehir Osmangazi University, Eskisehir, Turkey in 2010. He is research assistant in Engineering Faculty, Department of Metallurgical and Materials Engineering, Bartin, Turkey. His main interests include manufacturing technologies.

Dr. Joseph Stokes graduated from Mechanical and Manufacturing Engineering from Trinity College Dublin, Ireland in 1997. He holds Ph.D. at Dublin City University in 2003, Dublin, Ireland. He lectured part-time for two years in Dublin Institute of Technology Bolton Street from 1998 to 2000. In September 2000 he became a member of the academic staff in the School of Mechanical and Manufacturing Engineering in Dublin City University, Ireland. He was promoted to position of senior lecturer in DCU in 2009. He has been research active in the area of surface engineering since 1997. Applications of his research include: wear reduction, bio-coatings for implant replacement therapy, oil and gas protective coatings to mention a few.


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Published Online: 2013-05-26
Published in Print: 2012-11-01

© 2012, Carl Hanser Verlag, München

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