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Volume 6, Issue 4 (August 2017)
Special Issue Paper
Kinetics of the Formation of Boride Layers on EN-GJL-250 Gray Cast Iron
(Received 31 May 2016; accepted 18 November 2016)
Published Online: 29 August 2017
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In the present work, the EN-GJL-250 gray cast iron was pack-borided in a powder mixture consisting of 5 % B4C, 5 % NaBF4, and 90 % SiC. The boriding treatment was carried out in the temperature range 900°C–1000°C during 2, 4, and 6 h. The morphology of the generated boride layers was observed by an optical microscope and a scanning electron microscope. The phases in the borided layer were identified by X-ray diffraction (XRD) analysis, and Vickers microhardness testing was used to determine the microhardness profiles along the boride layers. The growth kinetics of boride layers was studied and the mass gain was estimated for the given boriding conditions. The regression model was also used to predict the total boride-layer thickness. As a result, the boron activation energy for EN-GJL-250 gray cast iron was estimated as 134.21 kJ mol−1 and compared with the literature data.
Commissariat à l’Energie Atomique, Centre de Recherche Nucléaire de Draria (CRND), B.P. 43, Draria, 16050 Alger, Algérie; and Université Amar Telidji de Laghouat, Laboratoire de Génie des Procédés,
The University of Science and Technology Houari Boumediene (USTHB), Faculté de Génie Mécanique et Génie des Procédés, Laboratoire de Technologie des Matériaux, Département SDM, Alger,
Université Amar Telidji de Laghouat, Laboratoire de Génie des Procédés,
Commissariat à l’Energie Atomique, Centre de Recherche Nucléaire de Draria (CRND),
Stock #: MPC20160077
Title Kinetics of the Formation of Boride Layers on EN-GJL-250 Gray Cast Iron