2010•Journal of Jilin UniversityRequires access

Microstructure and properties of cobalt-based alloy coating on tool steel surface prepared by laser cladding

Zhou Jie

Abstract

Co-based alloy coating was deposited on T10 tool steel by powder feeding laser cladding. Sections of such coatings were examined to reveal their microstructures and phases using scanning electron microscope ( SEM) and X-ray diffractometer ( XRD) . The results showed that the prime phase γ-Co and other phases, including Cr23C6,Co7W6 and CrNi existed in the coating. Some different solidification morphologies,such as planar ( at the interface) ,cellular and dendrite formed,varying from the interface to the surface. Fine microstructures of dendrite in dendritical regions strengthened the coating which caused the increases in microhardness and corrosion resistance in the laser cladded coating.

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Key concepts: Microstructure, Materials science, Coating, Scanning electron microscope, Diffractometer, Indentation hardness, Alloy, Dendrite (mathematics)