Effect of(Ti,W)C on Microstructure and Mechanical Properties of Ultrafine Ti(C,N)-Based Cermets AITranslate

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Chinese Library Classification Number:TG148[金属学及工艺—金属材料]

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Ultrafine Ti(C,N)-based cermets with different contents of(Ti,W)C solid solution powder were prepared by low pressure sintering.The effects of(Ti,W)C on the microstructure and mechanical properties of Ti(C,N)-based cermets were systematically studied.The results show that using(Ti,W)C instead of TiC+WC can lead to the formation of white core/ring structure in the microstructure of the cermets,and inhibit the formation of black core/ring structure.At the same time,the morphology of the hard phase changes from cuboidal to spherical.The Vickers hardness and fracture toughness of the cermets can be improved while keeping the bending strength unchanged.Under the condition of low(Ti,W)C content(2.5%~10%),with the increase of(Ti,W)C content,the size of the black core of the cermets decreases,and the white core/gray ring structure increases.The addition of(Ti,W)C makes the microstructure more uniform,enhancing the intergrain bonding force.And the hardness of the cermets increases gradually,while the bending strength and fracture toughness increase at first and then decrease.When the content of(Ti,W)C is 7.5%,the cermet has the best comprehensive mechanical properties,and the bending strength and fracture toughness are 2212 MPa and 9.0 MPa·m^1/2,respectively.