Improvement of TiC/Fe in situ composite layer formation on surface of Fe-based castings

•Composite layers were fabricated in steel casting using by reactive coatings.•In order to limit reactive infiltration the addition of moderator was added.•Moderator is a mixture of metal and non-metal powders.•Moderator decreases the heat effect within the area of the TiC reaction. This paper conce...

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Bibliographic Details
Published in:Materials letters 2022-02, Vol.309, p.131399, Article 131399
Main Authors: Szymański, Łukasz, Olejnik, Ewa, Sobczak, Jerzy J., Tokarski, Tomasz
Format: Article
Language:English
Subjects:
Castings
Composite layer
Ferrous castings
Fragmentation
Heterogeneity
Materials science
MMCs
Molecular composites
Reactive infiltration
SHS
TiC
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Summary:•Composite layers were fabricated in steel casting using by reactive coatings.•In order to limit reactive infiltration the addition of moderator was added.•Moderator is a mixture of metal and non-metal powders.•Moderator decreases the heat effect within the area of the TiC reaction. This paper concerns a method of fabricating a composite layer in cast steel castings. During the research, the fragmentation phenomenon of the composite layer was identified, which was revealed by the nonuniform structure in the whole length. In order to limit the fragmentation phenomenon understood as tending to the creation of the structural heterogeneity, discontinuity, and agglomeration of the reinforcement, the addition of a moderator was added. The presented results of our structural investigations indicate the stabilization of the composite layer with a 50 wt% addition of the moderator. The conducted research of XRD analysis and SEM indicated the presence of TiC within the composite zone area. The average hardness ranged between 650 and 810 HV1, which was an increase of more than a three-fold increase when compared to the matrix.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2021.131399