Characterization and Kinetic Analysis of Iron Boride Layer Formed on the GGG 70 Ductile Cast Iron

An alternative powder-pack boriding powder mixture containing H 3 BO 3 as boron source and commercial boriding powder containing B 4 C as boronizing agent were used for boriding of GGG 70 type ductile iron. As a result of XRD analysis, while only Fe 2 B phase was detected on the samples boronized wi...

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Bibliographic Details
Published in:Transactions of the Indian Institute of Metals 2021-07, Vol.74 (7), p.1701-1711
Main Authors: Yalamaç, Emre, Türkmen, İlyas, Fırtına, Özge
Format: Article
Language:English
Subjects:
Boriding
Boron carbide
Cast iron
Chemistry and Materials Science
Corrosion and Coatings
Empirical equations
Materials Science
Metallic Materials
Nodular iron
Original Article
Regression models
Thickness
Tribology
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Summary:An alternative powder-pack boriding powder mixture containing H 3 BO 3 as boron source and commercial boriding powder containing B 4 C as boronizing agent were used for boriding of GGG 70 type ductile iron. As a result of XRD analysis, while only Fe 2 B phase was detected on the samples boronized with alternative boriding mixture, besides Fe 2 B phase, small amount of FeB phase was also determined on the samples boronized with commercial powder. The growth kinetics of the boride layer forming on ductile iron was investigated and compared with literature studies. The value of boron activation energy for ductile iron was calculated as 184.67 kJ/mol. An empirical equation and a regression model were derived to estimate the thicknesses of boride layer as a function of the boriding parameters. The comparisons were made between the experimental boride layer thicknesses with estimated ones and the results were consistent with 99% accuracy.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-021-02249-y