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

Effect of Molybdenum on Wear Resistance of Cr-Nb Hard-Faced S355JR Steel

Die Wirkung von Molybdän auf den Verschleißwiderstand eines Cr-Nb gepanzerten S355JR Stahls
Nut Thongchitrugsa, Amnuaysak Chianpairot, Fritz Hartung and Gobboon Lothongkum
From the journal Materials Testing

Abstract

The effect of Mo on the abrasive wear resistance of (20–23)Cr-(7–8)Nb hard-faced S355JR steel by shielded metal arc welding (SMAW) was studied. Four types of flux, consisting of fixed Cr and Nb but varying Mo contents, coated on hard-facing electrode were used. Microstructure, micro hardness, and abrasive wear resistance of the hard-faced surface were investigated by ASTM G65 D procedure. The original microstructures consist of the primary coarse and eutectic carbides. Mo affects morphology of carbides by decreasing primary carbide size. When Mo content in the hard-faced surface was up to 6.43 wt.-%, the highest abrasive wear resistance and micro hardness were obtained. The decrease of primary carbide size is attributed to the increased nucleation induced by Mo addition. Network structure was observed when the Mo content reaches 10.19 wt.-%. The main mechanisms of wear are micro-cutting and carbide pulling out.

Kurzfassung

Die Wirkung eines durch Schutzgasschweißen mit (20–23)Cr-(7–8)Nb gepanzerten S355JR Stahls gegen abrasiven Verschleiß wurde in der diesem Beitrag zugrunde liegenden Studie untersucht. Es wurden vier Typen von Fließmitteln, die einen festen Cr- und Nb- aber variablen Mo-Gehalt aufwiesen, für die Panzerungselektroden untersucht. Es wurden das Gefüge, die Mikrohärte und der Widerstand der gepanzerten Oberfläche nach dem Standard ASTM G65 D untersucht. Das Originalgefüge besteht aus den primären, groben und den entektischen Carbiden. Molybdän beeinflusst die Morphologie der Carbide, indem die Größe der Primärcarbide verringert wird. Wenn der Molybdänanteil in der gepanzerten Oberfläche bis zu 6,43 wt.-% beträgt, erhält man den höchsten Verschleißwiderstand und die höchste Mikrohärte. Die Abnahme der Primärcarbidgröße ist begleitet von einer erhöhten Keimbildung, die durch Mo-Zusatz ausgelöst wird. Es wurde eine Netzstruktur beobachtet, wenn der Molybdänanteil 10,19 wt.-% erreicht. Die Hauptverschleißmechanismen bestehen in der Mikrozerspanung und dem Herausziehen der Carbide.


* Correspondence Address, Gobboon Lothongkum, Assoc. Prof. Dr.-Ing., Dept. of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Patumwan Bangkok 10330, Thailand, E-Mail:

Nut Thongchitrugsa was born in 1988. He is graduate student at the Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Thailand. He received a bachelor degree in Mechanical Engineering from King Mongkut's University of Technology Thonburi, Thailand in 2010. His research scope is related to development of hard-facing electrode for industrial application.

Amnuaysak Chianpairot, PhD, is researcher at Failure Analysis and Materials Corrosion Lab, Materials Reliability Research Unit, National Metal and Materials Technology Center. He received master degree in Metallurgical Engineering from University of California, Berkeley, USA and received PhD (Metallurgical Engineering) from the Chulalongkorn University, Thailand. His research interest is corrosion and failure analysis.

Fritz Hartung, Dr.-Ing, is a visiting professor at Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Thailand. He received master degrees and Dr.-Ing in Mechanical Engineering from University of Technology Magdeburg (Germany) in 1969 and 1975, respectively. He was head of Faculty of Technology Mechanical Engineering, Trier University of Applied Science, Germany. His areas of expertise are welding and metal joining.

Gobboon Lothongkum, a corresponding author, is associate professor and a member of the Innovative Metals Research Unit, Department of Metallurgical Engineering, Faculty of Engineering, Chulalongkorn University, Thailand. He received Dr.-Ing. degree from University of the Federal Armed Force Hamburg, Germany in 1994 and the International Welding Engineer Certificate of the International Institute of Welding in 2006. His areas of expertise include corrosion of metals and alloys, welding and metal joining, stainless steels and high temperature materials.


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

© 2014, Carl Hanser Verlag, München

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