Effects of TiC Content on Microstructure and Mechanical Property of WC-TiC-TaC Cemented Carbides

doi:10.15541/jim20160633

Abstract

Abstract:

WC-TiC-TaC cemented carbides were fabricated by hot-pressed sintering at 1600℃. Effects of TiC content on the microstructure and mechanical properties of these cemented carbides were investigated. It was found that when TiC content was increased from 10wt% to 25wt%, both the average grain size and the Vickers hardness increased progressively, but both the flexural strength and the fracture toughness decreased gradually. The increase of Vickers hardness was attributed to the increase of TiC content and the hardness of TiC was higher than that of WC. The value of the highest Vickers hardness was 19.81 GPa. This work also showed that the highest flexural strength (1147.24 MPa) was ascribed to the fine and homogeneous grains, and that the highest fracture toughness (14.60 MPa·m^1/2) was due to the intensive coupled mechanism of the fine-grain toughening, crack deflection, crack branching, crack bridging, and toughness dimples.

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Key words: WC-TiC-TaC cemented carbides, hot-pressed sintering, microstructure, mechanical properties

CLC Number:

TB333
TG711

GAO Jiao-Jiao, JIANG Long-Kai, SONG Jin-Peng, LIANG Guo-Xing, AN Jing, XIE Jun-Cai, CAO Lei, LV Ming. Effects of TiC Content on Microstructure and Mechanical Property of WC-TiC-TaC Cemented Carbides[J]. Journal of Inorganic Materials, 2017, 32(8): 891-896.

Figures/Tables 8

Table1 Compositions of WC-TiC-TaC cemented carbides

Sample	WC/wt%	TiC/wt%	TaC/wt%	Ni/wt%
S1	78	10	2	10
S2	73	15	2	10
S3	68	20	2	10
S4	63	25	2	10

Fig. 1 XRD patterns of WC-TiC-TaC cemented carbides

Fig. 2 BSE micrographs of polished surfaces of WC-TiC-TaC cemented carbides(a) WC-10wt%TiC-TaC (S1); (b) WC-15wt%TiC-TaC (S2); (c) WC-20wt%TiC-TaC (S3); (d) WC-25wt%TiC-TaC (S4)

Fig. 3 EDS results corresponding to Point A and Point B in Fig. 2

Fig. 4 Ta element distribution corresponding to Area C in Fig. 2

Fig. 5 Fracture morphologies of WC-TiC-TaC cemented carbides(a) WC-10wt%TiC-TaC (S1), (b) WC-15wt%TiC-TaC (S2), (c) WC-20wt%TiC-TaC (S3), (d) WC-25wt%TiC-TaC (S4)

Fig. 6 Influence of TiC content on mechanical properties of WC-TiC-TaC cemented carbides

Fig. 7 Crack propagation paths of WC-TiC-TaC cemented carbides(a)WC-10wt%TiC-TaC (S1); (b) WC-25wt%TiC-TaC (S4)

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