Characterization and Kinetic Analysis of Iron Boride Layer Formed on the GGG 70 Ductile Cast Iron
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Date
2021
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Abstract
An alternative powder-pack boriding powder mixture containing H3BO3 as boron source and commercial boriding powder containing B4C as boronizing agent were used for boriding of GGG 70 type ductile iron. As a result of XRD analysis, while only Fe2B phase was detected on the samples boronized with alternative boriding mixture, besides Fe2B 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. © 2021, The Indian Institute of Metals - IIM.