Kinetic Investigation and Wear Properties of Fe 2 B Layers on AISI 12L14 Steel
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UCTION
BORIDING is a thermochemical process in which the boron atoms are diffused into the surface of a workpiece to produce complex borides with the base metal.[1] The boriding treatment provides a high hardness corrosion resistance against acids and molten metals as well as an improvement in the wear resistance for the treated surfaces. In the case of ferrous alloys, the boriding process results in the formation of either a single layer (Fe2B) or double layer (FeB + Fe2B) with definite composition. By proper control of boron
M. KEDDAM is with the Laboratoire de Technologie des Mate´riaux, Faculte´ de Ge´nie Me´canique et Ge´nie des Proce´de´s, USTHB, El-Alia, Bab-Ezzouar, 16111 Algiers, Algeria. Contact e-mail: [email protected] M. ORTIZ-DOMINGUEZ and J. ZUNO-SILVA are with the Escuela Superior de Ciudad Sahagu´n-Ingenierı´ a Meca´nica, Universidad Auto´noma del Estado de Hidalgo, Carretera Cd. Sahagu´n-O tumba s/n, Zona Industrial CP 43990, Hidalgo, Mexico. M. ELIAS-ESPINOSA is with the Instituto Tecnolo´gico y de Estudios Superiores de MonterreyITESM Campus Santa Fe, Av. Carlos Lazo No. 100, Del. A´lvaro Obrego´n, CP 01389 Mexico City, Mexico. A. ARENAS-FLORES is with the Centro de Investigaciones en Materiales y Metalurgia, Universidad Auto´noma del Estado de Hidalgo, Ciudad Universitaria Pachuca-Tulancingo, km. 4.5, Pachuca, Hidalgo, Mexico. D. ZAMARRIPA-ZEPEDA and O.A. GOMEZ-VARGAS are with the Instituto Tecnolo´gico de Tlalnepantla-ITTLA, Av., Instituto Tecnolo´gico, S/N. Col. La Comunidad, CP 54070 Tlalnepantla de Baz, Estado de Mexico, Mexico. Manuscript submitted September 17, 2017.
METALLURGICAL AND MATERIALS TRANSACTIONS A
activity in the boriding agent for powder-pack boriding, it is possible to avoid the formation of FeB and to obtain a monolayer configuration (Fe2B). This monolayer configuration is desired since FeB is more brittle than Fe2B and is prone to crack under shock and impact. In the literature, several approaches have been developed for studying the kinetics of formation of boride layers and their properties on steels produced by different boriding methods (with and without boride incubation times). For example, Campos-Silva et al.[2] investigated the growth kinetics of FeB and Fe2B layers as well as the diffusion zone in AISI 316 steel by the pack-boriding process. They developed a kinetic model for estimating the values of boron activation energies. They also proposed a simple approach to estimate the expressions of weight gain per surface unit associated with the formation of the bilayer (FeB + Fe2B) and diffusion zone on the material surface. Kulka et al.[3] used a kinetic model for estimating the boron activation energies for FeB and Fe2B formed on the Armco iron substrate using the gas boriding process. In their work, a simple relationship was derived for eliminating the FeB phase through a diffusion annealing treatment. Campos-Silva et al.[4] also investigated the evolution of FeB and Fe2B layers on AISI 1045 steel by applying a kinetic model. A validation of their model was made by compar
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