Effect of carbon content on the microstructure and mechanical properties of superfine Ti(C, N)-based cermets

Tsipas

International Journal of Refractory Metals and Hard Materials

2013

Influence of carbon content on the sinterability of an FeCr matrix cermet reinforced with TiCN, International Journal of Refractory Metals and Materials, Jan. 2013, v. 36, 283-288 AbstractThe influence of carbon content on an iron-chromium cermet composite reinforced with Ti(C,N) (50 vol%) has been studied. A thermodynamic simulation was performed using the ThermoCalc software to calculate the phase diagram of the composite. The results were validated by a thermal study performed using differential thermal analysis (DTA), and cermet samples with C percentages between 0 and 1 wt% added to the steel matrix were prepared using a conventional powder metallurgy process. The sintered samples were characterised by measurements of density and hardness, microstructural analysis using scanning electron microscopy (SEM), microanalyses using energy dispersive X ray spectroscopy (EDX) and X-ray diffraction (XRD). The results obtained show a significant influence of the C percentage on the solidus temperature, which influences sintering behaviour, leading to changes in the Ti(C,N) particles´ shape and composition, due to changes in the stoichiometry of the Ti(C,N). This influence is reflected in the cermet microstructure and hardness. The results are discussed with reference to the DTA and thermodynamic studies.

Section: *Text In Ms Wordmentioning

confidence: 99%

Influence of carbon content on the sinterability of an FeCr matrix cermet reinforced with TiCN

Tsipas

International Journal of Refractory Metals and Hard Materials

2013

“…Many research works have highlighted the influence of the carbon content on the properties of TiCN-based cermets [16,17,18,19]. These works refers to Co/Ni matrices, but no investigations have been found for Fe based matrices.…”

Section: Introductionmentioning

confidence: 99%

Microstructural development and mechanical properties of iron based cermets processed by pressureless and spark plasma sintering

Materials Science and Engineering: A

Biest

et al. 2012

Iron-based cermets are an interesting class of metal-ceramic composites which properties and the factors influencing then are to be explored. In this work the metal matrix contains Cr, W, Mo and V as alloying elements, and the hard phase is constituted by 50 vol % of titanium carbonitride (TiCN) particles. The work studies the influence of the C content and the processing method on the sinterability, microstructure and hardness of the developed cermet materials. For that purpose, cermet samples with different C content in the matrix (0 wt%, 0.25 wt%, 0.5 wt%, 1.0 wt%) were prepared by conventional pressureless sintering (CPS) and, in order to achieve finer microstructures and to reduce the sintering time, by Spark Plasma Sintering (SPS). The density and hardness (HV30) of the processed materials was evaluated, while their phase composition and microstructure was characterised by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM), respectively. The equilibrium phase diagram of the composite material was calculated by ThermoCalc software in order to elucidate the influence of the carbon content on the obtained phases and developed microstructures.

“…Many research works have highlighted the influence of the carbon content on the properties *Text in MS Word Click here to view linked References of Ni/Co-TiCN cermets [7][8][9][10]. However, there are no systematic studies on the influence of the C content on Fe matrix composites, a former paper by the authors of this work illustrated the variation of mechanical properties as well as of the microstructural changes in several systems formed by Fe and TiCN [11].…”

Section: Introductionmentioning

confidence: 91%

“…There are however some disadvantages, mainly related to the processing, due to the lower wettability during liquid phase sintering between iron and TiCN particles than Ni and Co matrixes [2], and to the risk of producing reaction products that lead to embrittlement. The addition of some elements or compounds, such as Mo, Mo 2 C or WC [3][4][5][6], as well as Cr [3,7] have been reported to improve the sintering performance of cermets. The addition of those alloying elements to the Fe matrix also increases hardness and hardenability, as well as the volume fraction of carbides formed during sintering that increase the total amount of the ceramic phase.…”

Section: Introductionmentioning

confidence: 99%

High temperature transformations in a steel-TiCN cermet

Mari

International Journal of Refractory Metals and Hard Materials

2013

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.