Effect of Sintering Temperature on Microstructure and Properties of Ti(C,N)-Based Steel-Bonded Cemented Carbides AITranslate

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Chinese Library Classification Number:TG135.5[一般工业技术]

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Ti(C,N)-based steel-bonded cemented carbides were prepared by powder metallurgy method using Fe-Co-Ni as the binder phase.The effects of sintering temperature on the microstructure,phase com-position,thermodynamic properties,mechanical properties and fracture mechanism of the alloys were in-vestigated by scanning electron microscope with an attached energy-dispersive spectrometer(SEM-EDS),X-ray diffractometer(XRD),conbined with thermodynamic analysis and mechanical property testing.The results show that the main phases in the alloy are Ti(C_0.5,N_0.5)and Fe-Co-Ni solid solution.When the sin-tering temperature is lower than 1350℃,Fe₃C brittle phase still exists in the alloy.The density,trans-verse rupture strength and Vickers hardness of the alloy show a trend of increasing first and then decrea-sing with the increase of sintering temperature,while the average grain size shows a trend of decreasing first and then increasing.When the sintering temperature is 1370℃,the microstructure of the alloy is dense and the distribution of the binder phase is uniform.At the same time,the relative density,Vickers hardness and transverse rupture strength of the alloy reach the maximum values of 98.68%,1053.9 HV30 and 2280 MPa,respectively.