High temperature transformations in a steel-TiCN cermet

Abstract

The influence of the carbon content on the microstructure, phase transformation and hardness of an iron-based cermet is studied. The cermet is constituted by a high-alloyed steel as matrix, and TiCN particles (50 vol. %) as reinforcement. The material is produced by conventional powder metallurgy techniques, that is, uniaxial pressing and sintering, and the carbon content is varied from 0 wt % to 1 wt %. The aim of the research is the understanding of the transformations undergone by the material with increasing C amounts when temperature is increased. For this purpose, the cermet is studied by Mechanical Spectroscopy (MS) and Differential Thermal Analysis (DTA) and characterized by XRD, SEM and hardness measurements. The equilibrium phase diagram calculated by Thermocalc software contributes to explain the differences found on phase transformations with respect to the C content of the cermet . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 High temperature transformations in a steel-TiCN cermet. AbstractThe influence of the carbon content on the microstructure, phase transformation and hardness of an iron-based cermet is studied. The cermet is constituted by a high-alloyed steel as matrix, and TiCN particles (50 vol. %) as reinforcement. The material is produced by conventional powder metallurgy techniques, that is, uniaxial pressing and sintering, and the carbon content is varied from 0 wt % to 1 wt %. The aim of the research is the understanding of the transformations undergone by the material with increasing C amounts when temperature is increased. For this purpose, the cermet is studied by Mechanical Spectroscopy (MS) and Differential Thermal Analysis (DTA) and characterized by XRD, SEM and hardness measurements. The equilibrium phase diagram calculated by Thermocalc software contributes to explain the differences found on phase transformations with respect to the C content of the cermet.

Influence of carbon content on microstructure and properties of a steel matrix cermet

“…By increasing the C content the melting temperature of the steel matrix decreases, as it can be observed in the phase diagram of the cermet M2 HSS/TiCN showed in the reference [25], so that…”

Phase diagrams in alternative hard materials: Validation of thermodynamic simulation through high temperature x-ray diffraction, differential thermal analysis and microstructural characterization

“…Influence of C content in density, grain size and binder solid solution also translates into modified mechanical properties. Addition of a moderate amount of extra C has verified to improve macrohardness and the intrinsic -small-scale -hardness of the binder phase [88,89,91,92,[98][99][100][101][102].…”

“…Recent investigations have demonstrated that processing of Ti(C,N) with an FeNi alloy by powder metallurgy results in fully-dense cermets with final properties comparable to some cemented carbides [143,151]. Moreover, addition of a conservative amount of extra C has shown to play a dramatic role during the sintering stage of Ti(C,N)-based materials, resulting in enhanced mechanical properties [88,89,98,99]. Added up to a conservative amount -i.e.…”

Steel binder cermets processed by combination of colloidal processing and powder metallurgy

“…It is important to analyze the content of C and O in such materials because the final properties of them are very sensitive to the C content [11,1]. In the work [1] it was concluded that an increase of 0,5 wt.…”

“…In this table is showed the hardness of the M2/TiCN cermet with different carbon additions to study the changes in the hardness values by increasing the carbon content. The presence of higher carbon content involves an increase in hardness because C decreases the liquidus temperature [11] improving the densification of the sample during sintering and, also higher carbon content increases the formation of secondary carbides. Table 7.…”