Characterization of Adherence Steels Hardened Superficially
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Characterization of Adherence Steels Hardened Superficially D. Sanchez-Huerta1, , T. De la Mora-Ramírez1,ᵇ, M.A. Doñu-Ruiz2,1, , N. López-Perrusquia2,1, , J. V. Cortés-Suarez3, 1 Universidad Politécnica del Valle de México; Grupo Ciencia e Ingeniería de Materiales, UPVM, Tultitlan, Estado de México. 2 Instituto Politécnico Nacional, SEPI-ESIME, Adolfo López Mateos, Zacatenco, México D.F., 07738, México. 3 Univerisdad Autónoma Metropolitana Unidad Azcapotzalco, Av. San Pablo 180 Azcapotzalco 02200, México .D.F. Área de Ciencia de los Materiales. [email protected], ᵇ [email protected], [email protected], [email protected] [email protected]
ABSTRACT This study evaluates the behavior of the adherence layers - sawn flat iron boride formed on the surface of steels used in manufacturing industry in Mexico. In steels AISI 1018, AISI 8620 and AISI 316 was characterized this behavior, boriding thermochemical treatment with box technique, with a processing temperature of 1273 °K, with an exposure time of 8 hours. Furthermore the adherence is assessed by the Rockwell C hardness technique prescribed by the German standard VDI 3198 of traction, this impact test qualitatively determine the type of adherence formed three thermochemical steels treated by the technique of boriding. Moreover optical microscopy determines the type of film morphology FeB/ Fe2B of each of the materials exposed to a boriding, also shows the thicknesses of the phases generated in the surface type in all three steels boriding. Phase presence boride FeB/Fe2B was determined by X -ray diffraction (XRD). Technique for scanning electron microscopy (EDS) was evaluated qualitatively the presence of FeB/Fe2B of boronizing. Otherwise determines the hardness and elastic modulus by nanoindentation technique of the phases present in the three steels. Lastly, AISI 1018 and AISI 8620 are bounding scale H1 to H3, the AISI 316 steel has an adherence of H3 to H6 under German standard VDI 3198. Keywords: adhesion, nano-indentation, steel, hardness, coating.
INTRODUCTION Boriding the surface treatment, which is a technique developed and employed in the industry to produce high hardness, wear resistance, corrosion and abrasion at the boride layers on ferrous. Boriding steels have high hardness between 1,600 to 2,000 Hv [1-2] which the boron atoms are dissolved in the interstices of the iron, observed coating FeB and Fe2B types, which depends on the potential of the medium boriding and alloys substrate. Adherence in materials exposed to corrosion, wear and tear dry damp is an important aspect for the reliability of components manufacturing engineering, metalworking and agriculture. Adherence test is often based on the application of mechanical weight. In the case of
low adherence interface, the types of fractures may develop according to the local press field at the interface, as the fracture resistance of the layer, substrate and the interface. The types of the interface fracture low. It can also be parallel to the interface of the substrate or coating m
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