Browsing by Keyword "Reinforcement"
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Item Bonding strength of steel rebars perpendicular to the hardened 3D-printed concrete layers(2022-07-18) Aramburu, A.; Calderon-Uriszar-Aldaca, I.; Puente, I.; ECOEFICIENCIA DE PRODUCTOS DE CONSTRUCCIÓN; Tecnalia Research & InnovationPassive rebars are inserted into interior hollow channels within a 3D-printed mortar geometry and then bonded with a wet joint of filling mortar, in order to test the bonding strength of the rebars within the mortar structure. Standardized test procedures are adapted for the test procedure. The test results revealed bonding strengths with shear stresses within an interval between 16.75 MPa and 18 MPa, dependent upon rebar diameter, and good early strength development of the bonding mortar of at least 14 MPa during the first week. No specimen failed because of debonding between the filling mortar and the 3D-printed cylinder, nor because of debonding of the cylinder and the concrete poured around its exterior.Item Desarrollo de aceros reforzados con carburos primarios vía metalurgia líquida(2005) Agote, I.; Gutiérrez, M.; Orbegozo, M.; Asensio, M.; Erauskin, J. I.; Erausquin, L. Á; Echeverría, J. I.; Roncal, J.; EXTREMAT; SG; Caracterización y Validación. Materiales; Centros PRE-FUSION TECNALIA - (FORMER)The steel reinforcement by means of the addition of primary carbides via liquid metallurgy needs to fulfil two essential requirements to be technically viable: the development of a solid reinforcing product which is appropriate to be mixed with the steel and the optimisation of the metallurgic addition of these reinforcing particles into the liquid steel. Besides, the improvement of the reinforced alloy characteristics is directly related to the particles' nature of reinforcing particles, their homogeneous and uniform distribution in the matrix and their size and morphology. The manufacture of these carbides by SHS ('Self propagating High temperature Synthesis') and their addition before steel is poured into moulds allows achieving the above-mentioned conditions.Item Metal Matrix Composites(Wiley-VCH, 2013-04-12) de Cortázar, Maider García; Egizabal, Pedro; Barcena, Jorge; Le Petitcorps, Yann; CIRMETAL; Tecnalia Research & Innovation; EXTREMATItem Reinforcement of austenitic manganese steel with (TiMo) carbide particles previously synthesized by SHS(2009) Erauskin, Jose Ignacio; Sargyan, Ara; Arana, Jose Luis; Centros PRE-FUSION TECNALIA - (FORMER)The austenite of the Hadfield type manganese steels (1.0-1.4% C; 12-14% Mn), even though able to be hardened by impact, explosion, etc., is very ductile, tough and deformable, so that the industrial parts made with this material often suffer important geometric deformations during service. To minimize this problem, it is necessary to reinforce the austenitic matrix with hard, microscopic and dispersed ceramic particles, such as TiC, in order to increase the austenite stiffness while maintaining its toughness. Indeed, the development of a liquid metallurgy process enabling the reinforcement by means of the addition of the ceramic material to the molten metal in the melting furnace would become an important advance in this field. Nevertheless, these ceramic products are prone to the coalescence and have poor wettability by the molten bath, so that, their yield and the subsequent property improvement is very low. These disadvantages are solved if the ceramic particle is a complex carbide (TiMo)C bonded by metallic Fe, having a masteralloy of the Fe(TiMo)C type made by self-propagated high temperature synthesis (SHS). After that, its addition to the liquid austenitic manganese steel, the pouring of the mix (steel+carbides), its solidification, for example in sand molds, and the subsequent heat treatment (solution annealing and rapid quenching) produces composite castings or parts composed by an austenitic matrix and discrete carbide (TiMo)C particles inserted in it. This paper describes the process required to fabricate such a material and its characteristics.