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

There is a marked correlation between the composition, microstructure and properties in TiCN-based cermets. In the case of using iron alloys as metallic matrix the carbon content is of particular significance, as not only influences the stoichiometry of ceramic phase but also induces phase transform...

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Bibliographic Details
Published in:International journal of refractory metals & hard materials 2018-09, Vol.75, p.78-84
Main Authors: Alvaredo, P., Bruna, P., Crespo, D., Gordo, E.
Format: Article
Language:English
Subjects:
Alloying elements
Carbon
Carbon content
Cermets
Electron microscopy
Enginyeria dels materials
Fe Cermets
Ferrous alloys
Field emission microscopy
Microscòpia electrònica
Microscòpia electrònica de transmissió
Microstructure
Mossbauer spectroscopy
Nickel
Phase transitions
Powder metallurgy
Properties (attributes)
Scanning electron microscopy
Steel
Stoichiometry
TiCN
Titanium carbonitride
Transmission electron microscopy
Transmission Mössbauer spectroscopy
X-ray diffraction
Àrees temàtiques de la UPC
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Summary:There is a marked correlation between the composition, microstructure and properties in TiCN-based cermets. In the case of using iron alloys as metallic matrix the carbon content is of particular significance, as not only influences the stoichiometry of ceramic phase but also induces phase transformations in the steel matrix. However, such influence has been less studied in steel matrix cermets than in conventional Ni or Co ones, so the aim of this work is to contribute to the study of the influence of carbon content on the microstructure and properties of a steel matrix cermet containing fixed quantities of alloying elements. Samples were prepared by powder metallurgy and characterized combining different techniques as Transmission Mössbauer spectroscopy (TMS), X Ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM), to explain differences found in hardness and toughness. •Large increase in hardness and toughness by increasing carbon content.•Appearance of austenite and increase of martensite by increasing carbon content.•Presence of solid solution (Ti,M)(C,N) resembling the typical core-rim structure.
ISSN:0263-4368
2213-3917
DOI:10.1016/j.ijrmhm.2018.04.006