ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Investigations on the Abrasive Wear Behaviour of Flame Sprayed Ni–Cr–Co–Si Alloy Coating Deposited on Mild Steel Substrate
Sudhir HarshaDheerendra Kumar DwivediAjai Agrawal
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2006 Volume 46 Issue 10 Pages 1473-1478

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Abstract

In present paper the influence of the post spray heat treatment on microstructure, microhardness and abrasive wear behaviour of flame sprayed Ni–Cr alloy (EWAC 1004) coatings deposited on mild steel has been reported. Coatings were deposited by oxy-acetylene flame spraying torch. The post spray heat treatment of the coatings was done at 800°C for 2 h. Wear behaviour of coatings was evaluated using pin on disc wear system against 120 and 600 grades SiC abrasive medium at 5 N, 10 N, 15 N and 20 N normal load. Results showed that the influence of normal load on wear rate is governed by the microstructure, hardness and abrasive grit size. Heat treatment increased average microhardness of the coating. Heat treatment of these coatings deteriorated the abrasive wear resistance against both fine and coarse abrasive mediums. In general, increase of normal load increased the wear rate. SEM study showed that wear is largely taken place by plowing, micro-cutting and crater formation mechanisms.

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© 2006 by The Iron and Steel Institute of Japan
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