Investigations on the Abrasive Wear Behaviour of Flame Sprayed Ni–Cr–Co–Si Alloy Coating Deposited on Mild Steel Substrate
Sudhir HARSHA, Dheerendra Kumar DWIVEDI, Ajai AGRAWAL
ISIJ International
abstract:In present paper the inuence of the post spray heat treatment on microstructure, microhardness and abrasive wear behaviour of ame sprayed Ni Cr alloy (EWAC 1004) coatings deposited on mild steel has been reported. Coatings were deposited by oxy-acetylene ame spraying torch. The post spray heat treat- ment 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 inuence 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 ne 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.
keywords:Ni–Cr coating; Abrasive wear; Mild steel; flame thermal spraying; post spray heat treatment; microhardness and microstructure.
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