Materials Transactions Online

Materials Transactions, Vol.54 No.03 (2013) pp.399-404
© 2013 The Japan Institute of Metals

Effects of MC Carbide Precipitates on the Microstructure and Mechanical Properties of Cobalt-Based Alloys Adding TiC Powder via Vacuum Sintering Process

Shih-Hsien Chang and Chih-Chien Ko

Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei 10608, Taiwan, R. O. China

In this study, different amounts of fine TiC powders (0, 10, 15 and 20 mass%) were mixed and added to cobalt-based alloy powders. Then, the mixed composite materials (cobalt-based alloy and TiC powders) were vacuum sintered at 1260, 1270, 1280 and 1290°C for 1 h, respectively. The experimental results showed that the highest TRS value of 1485.1 MPa was obtained by the addition of 15 mass% TiC powder and sintering at 1280°C for 1 h; while the highest hardness value of HRA 80.4 was obtained by 20 mass% TiC powder sintered at 1290°C for 1 h. In addition, two types of carbide precipitates appeared in the microstructure. Without added TiC powder of the specimen, fine plate-like precipitates of M6C and M23C6 carbides were obvious on the grain boundary; but when TiC powder was added to the specimens, only M23C6 carbides were observed after sintering treatment. The result also showed that a suitable amount of TiC additive (15 mass%) effectively inhibits carbide precipitation and growth.

(Received 2012/08/27; Accepted 2012/12/25; Published 2013/02/25)

Keywords: titanium carbide (TiC) powder, cobalt-based alloy, transverse rupture strength (TRS), sintering, M23C6 carbides

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