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

Alvaredo, P.; Gordo, E.; Biest, Omer Van der; Vanmeensel, Kim

doi:10.1016/j.msea.2011.12.107

Cited by 28 publications

(14 citation statements)

References 18 publications

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“…Philips X´Pert equipment was used for the X-ray diffraction (XRD) analyses, performed for phase identification and crystalline analysis. From the X-ray diffraction spectra, the Ti(C,N) lattice parameter was calculated using Cohen´s method [13], which was chosen to avoid systematic measurement errors in the calculation of the lattice parameter from the diffraction angle [14]. The phase diagrams shown in Figure 1 were calculated using the Thermocalc software.…”

Section: Characterisation and Microstructural Evolutionmentioning

confidence: 99%

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

Alvaredo

Tsipas

Gordo

2013

International Journal of Refractory Metals and Hard Materials

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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.

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Section: Characterisation and Microstructural Evolutionmentioning

confidence: 99%

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

Alvaredo

Tsipas

Gordo

2013

International Journal of Refractory Metals and Hard Materials

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“…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]. The complex microstructure shown in these cermets and the complex relations among the constituents make it difficult to identify the parameters affecting the final properties.…”

Section: Introductionmentioning

confidence: 91%

High temperature transformations in a steel-TiCN cermet

Alvaredo

Mari

Gordo

2013

International Journal of Refractory Metals and Hard Materials

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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.

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“…% NbC [22]. For comparison purposes, a cermet composed by a high-speed steel matrix (grade M2) with 50 vol.% Ti(C,N) particles of size about 4µm, after uniaxial pressing and vacuum sintering at 1400ºC had a hardness of 1336 HV [23]. The aim of this work is the design, processing and characterization of an iron-based cermet with NbC particles as hard phase.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…some studies about Fe-based cermets with NbC as that about mechanosynthesis (1224HV) [21] or compared to other compositions like M2-TiCN (1336 HV) [23], but is similar or higher than the hardness achieved in most works related to Fe-NbC system (286 -800HV) [17], [20], [22], [28]. It is noteworthy that this study did not use any method to decrease the particle size or to improve the dispersion of the carbides in the matrix.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Cermets based on FeAl–NbC from composite powders: Design of composition and processing

Franco

Costa

Tsipas

et al. 2015

International Journal of Refractory Metals and Hard Materials

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The aim of this work is the design, processing and characterization of a metal-ceramic composite (cermet) with an iron -aluminum alloy as metallic matrix and NbC as ceramic phase. The cermet is obtained from a composite powder containing in situ formed NbCrich precipitates on an iron rich metal matrix. The starting powder was supplied by CBMM (Brazil), and it was produced by a synthesis process under development which introduces other metals such as Al, Si and Ti to the composition. Due to the in situ process, good bonding is expected between the carbide and the matrix. However it is necessary to study the processability of those complex particles and the transformations occurring during sintering to get the final microstructure. Thermodynamic studies by means of ThermoCalc ® software were performed to predict the phases stable with the starting composition and also the influence of Fe and C additions. Samples were produced by uniaxial pressing and vacuum sintering (PS), and also by Field Assisted Hot Pressing (FAHP). The processing parameters for PS processing, that is, sintering temperature and time were based on themodynamic simulations by ThermoCalc ® software together with thermal analysis. The powders were characterized by measuring density, particle size, carbon content and chemical composition; and consolidated samples by density and Vickers hardness. The microstructure and morphology of the powder and consolidated samples was analyzed by SEM. The addition of Fe and both C and Fe to the starting cermet composition provided good results as the final microstructure consisted essentially of NbC and Fe matrix. Abbreviations PS -Pressing and Sintering FAHP -Field Assisted Hot Pressing

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

Cited by 28 publications

References 18 publications

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

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

High temperature transformations in a steel-TiCN cermet

Cermets based on FeAl–NbC from composite powders: Design of composition and processing

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