Affiliation:
1. Kunming University of Science and Technology
Abstract
WC-Co surface reinforced composite was formed by V-EPC (vacuum-expendable pattern casting), and the microstructure of the matrix in the composite was investigated. The results show that the Co addition caused the appearance of granular pearlite and troostite in the matrix, therefore the brittle tendency of the composite was lighten. After the molten steel infiltrating into the preform, the component diffusion in matrix decreased from the substrate to the surface of composite, the composition of the matrix became more uneven, and the formation of the granular pearlite and troostite were facilitated. When the atomic concentration of W and C in the matrix increased, Co3W3C, η type carbide, was easier to separate out. Before the temperature of the composite drop to 1200°C, Co3W3C could precipitate in the interface reaction between the matrix and the tungsten carbide particles, the hardness of the matrix would be increased, and then the abrasive resistance of the composite could be improved.
Publisher
Trans Tech Publications, Ltd.
Cited by
3 articles.
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