Strengthening and toughening of Ti(C,N)-based cermets: (Ti,W)C additive design and the mechanism
Source abstract
Abstract
(Ti 0.88W 0.12 )C solid-solution is characterized by the lowest formation energy and hence it can significantly affect the microstructure and properties of Ti(C,N)-based cermets. This research aims to explore the design principle for (Ti 0.88W 0.12 )C addition amount, and the related strengthening mechanism. 28TiC 0.7N 0.3–35(Ti 0.88W 0.12)C–4.5TaC–4.5NbC–8Mo 2C–10Ni–10Co (A) and 48TiC 0.7N 0.3–15(Ti 0.88W 0.12)C–4.5TaC–4.5NbC–8Mo 2C–10Ni–10Co (B) were prepared. On considering the application market expansion, the effect of TiC 0.7N 0.3/(Ti 0.88W 0.12 )C ratio on the microstructure, mechanical properties and corrosion resistance was investigated. The results show that the hard phase in the two cermets exhibits a preferred orientation of (111) plane. Compared with cermet A, cermet B is characterized by a more uniform microstructure, finer hard phase grains, and 1.23 times higher transverse rupture strength (TRS). Hardness, Palmqvist toughness and TRS of cermet B are 90.5HRA, 12.1 MPa m 1/2 and 2616 MPa, respectively. Hardness and toughness of cermet A are 0.4 HRA and 1.06 times higher than that of cermet B, respectively. The results of electrochemical corrosion experiments in H 2SO 4 (pH = 1) and NaOH (pH = 13) solutions show that cermet B exhibits better corrosion resistance. Both the cermets exhibit excellent resistance to NaOH solution corrosion. The strengthening mechanism driven by TiC 0.7N 0.3/(Ti 0.88W 0.12)C ratio is discussed.
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