Microstructure and Mechanical Properties of Cobalt Alloy Coating Deposited by Electro-Spark

Abstract:

Stellite190 cobalt alloy coating was deposited on 45 carbon steel by electro-spark deposition. Formation mechanism, microstructure, phase composition and mechanical properties of the coating were researched, fracture mechanism of the coating was analyzed. The results indicate that, the coating has dense and well distributed microstructure, mainly composed of Co, (CoCrW)₆C, Cr₇C₃. The coating presents excellent mechanical properties with a tensile strength of 731.83 MPa, a bonding strength of 213.01 MPa and good peeling resistance. The mechanism for tensile fracture of the coating is dimple fracture, and for shear fracture is cleavage fracture.

• Periodical: Advanced Materials Research (Volumes 881-883)
• Pages: 1400-1404
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.881-883.1400
• Online since: January 2014
• Authors: Qi Feng Jing, Ye Fa Tan*, Jian Tang, Hua Tan, Xiang Hong, Wei Gang Wang
• Keywords: Cobalt Alloy, Electro-Spark Deposition, Fracture Mechanism, Mechanical Property

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