| Fabrication, microstructure evolution, and mechanical properties of Ti(C,N)-HfN-WC-Ni-Mo cermets |
| Jiabao Liu1, Jinpeng Song1, Jiaojiao Gao2, Weiqi Meng1, Shiheng Hu1, Yao Wang1 |
1College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
2College of Aeronautics and Astronautics, Taiyuan University of Technology, Taiyuan, 030024, China |
|
|
|
Received: October 15, 2023; Revised: December 20, 2023 Accepted: January 28, 2024. Published online: February 23, 2024. |
|
|
|
| ABSTRACT |
|
Ti(C,N)-HfN-WC-Ni-Mo cermets were fabricated, and effects of HfN and WC content and sintering temperature on their microstructural evolution and mechanical properties were investigated. These cermets were primarily comprised of Ti(C0.41,N0.5), HfN, WC, TiC, Mo and Ni. At an additive concentration of 30 mol.%, the cermet exhibited the most homogeneous microstructure. The grain size gradually increased with increasing sintering temperature. The defects in the cermet sintered at 1500 ℃ significantly reduced, and the fine grains were homogeneously distributed. The fracture mode in cermets was a combination of transgranular fracture and intergranular fracture. Vickers hardness increased, flexural strength and fracture toughness first increased and then decreased with an increase of HfN and WC content. The cermet sintered at 1500 ℃ exhibited better mechanical properties: Vickers hardness was 22.29 GPa, flexural strength was 1271.58 MPa, and fracture toughness was 7.33 MPa·m1/2. In addition, the toughening mechanism of the Ti(C,N)-HfN-WC cermets mainly involved crack deflection and bridging. |
| Key words:
Ti(C,N)-based cermets · Hot-pressing sintering · Microstructure · Mechanical properties |
|
PDF Links 
Full text via DOI
Download Citation 
