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- Title
Reaction Process and Influence of WC Content on Microstructure and Mechanical Properties of Ti(C, N)-Based Cermets.
- Authors
Xianrui Zhao; Zhanjiang Li; Qintao Li; Dunwen Zuo; Qiangyong Zhang; Zhengyu Zhu; Guixiang Liu; Yong Chen; Feng Xu
- Abstract
The incorporation of WC promotes the sintering and grain refinement of Ti(C, N)-based cermets, leading to superior mechanical and functional properties. Herein, we present the reaction process of CoTiCBNWC system and influence of WC content on microstructure and mechanical properties of Ti(C, N)-based cermets. The results reveal that Ti(C, N) is produced due to the combination of C/TiN or TiN/TiC, whereas TiB2 is formed due to the reaction between B/TiB or Ti/B. Moreover, (W, Ti)(C, N) solid-solution is synthesized due to the reaction of Wand C with TiN in the liquid state. In addition, XRD analysis indicates the presence of a small amount of CoW2B2 and Co3C phases with WC content of 15 and 20 mass%. Furthermore, the content of core-ring structure gradually increases with the increase of WC content from 5 to 20 mass%. Also, the grain size increases from 0.364µm to 0.484µm with increasing WC content from 5 to 20 mass%. On the other hand, the porosity initially decreases with increasing WC content, followed by a gradual increase. Consequently, the microhardness, fracture toughness and bending strength initially increase with increasing WC content, followed by a decrease. The maximum microhardness, fracture toughness and bending strength are found to be 2010HV10, 7.21 MPa·m1/2, and 725 MPa, respectively.
- Subjects
TUNGSTEN carbide; MICROSTRUCTURE; MECHANICAL behavior of materials; SINTERING; GRAIN refinement
- Publication
Materials Transactions, 2020, Issue 11, p2149
- ISSN
1345-9678
- Publication type
Article
- DOI
10.2320/matertrans.MT-M2020186