Autor: JORGE LEOBARDO ACEVEDO DAVILA

Mathematical Modeling of Temperature for the Deposition of Particles of Fe-Cr-Mo on Tool Steel D2 by HVOF

CARLOS ALBERTO GUEVARA CHAVEZ JORGE LEOBARDO ACEVEDO DAVILA PEDRO HERNANDEZ GUTIERREZ FRANCISCO CEPEDA RODRIGUEZ (2012)

This research examined the influence of process parameters influencing the deposit of a coating structure Diamalloy 1008 (FeCrMo alloy mixture) applied by oxyfuel highspeed (HVOF) on steel samples grade D2 tool. This type of coating is commonly used as protection against wear and corrosion. But it has the ability to rebuild areas damaged by weathering and erosion. The formulation of the mathematical model of the temperature with respect to the deposition of repair material on the substrate prior to impact, to assess the behavior of the particle trajectory, in order to predict the behavior under the conditions of liquid, slurry and solid.

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Mathematical model, HVOF, Coating INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA DE MATERIALES

Effect of Travel Speed and Mixed Gas Penetration Protection on Mechanical Properties During the Manufacture of 304L Stainless Steel Tubing by the GTAW Process

PEDRO HERNANDEZ GUTIERREZ JORGE LEOBARDO ACEVEDO DAVILA CARLOS ALBERTO GUEVARA CHAVEZ JOSE JORGE RUIZ MONDRAGON FRANCISCO CEPEDA RODRIGUEZ (2012)

The austenitic stainless steels of type 304L are alloys which have carbon content below 0.03%.

Applications of this stainless steel includes tubing for cooling systems in the automotive industry. The

present study was conducted to evaluate the effect of variables involved in welding operations by the

GTAW process of an austenitic stainless steel pipe grade 304L on characteristics as penetration and

mechanical properties. Some variables to consider are travel speed and shielding gas mixture. An

analysis of variance was used to determine which variable promotes the greatest impact in this process.

According obtained results, hydrogen content has an important effect on penetration; mechanical

properties were not affected by changing considered variables.

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Penetration; Hydrogen; Welding Travel speed; Stainless steel INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA INDUSTRIAL

Effects of Silicon Nanoparticles on the Transient Liquid Phase Bonding of 304 Stainless Steel

HECTOR MANUEL HERNANDEZ GARCIA RITA MUÑOZ ARROYO JORGE LEOBARDO ACEVEDO DAVILA FELIPE DE JESUS GARCIA VAZQUEZ FELIPE ARTURO REYES VALDES (2014)

Transient liquid phase (TLP) bonding of 304 stainless steel with nickel based filler metal, BNi-9, was performed to

study the influence of silicon nanoparticles (NPs) on the mechanical and structural properties of the bonding area.

It was found that silicon NPs act as a melting point depressant in the brazing process; the formation of silicon TLP

induces the dissolution of elements of the metal filler and promotes a uniform distribution in the bonding area.

Silicon NPs induce the development of smaller eutectic structures in the melting zone; it has been related to

microhardness measurements, which are lower when the silicon NPs are used in the brazing process.

Artículo

Nanopartículas INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA METALÚRGICA

Finite Element Method Analysis of Thermal, Mechanical and Microstructural Behavior of GMAW Multipass Weld Joint of Hardox 400 and ASTM 514 Steel Plates

FRANCISCO CEPEDA RODRIGUEZ JORGE LEOBARDO ACEVEDO DAVILA EDGAR DANIEL AGUILAR CORTES CARLOS ALBERTO GUEVARA CHAVEZ PEDRO HERNANDEZ GUTIERREZ (2012)

The truck assembly used in the mining industry involves a considerable amount of welding

applications, where the materials that have to be joined differ in metallurgical and mechanical

properties. The complexity in the analysis of these joints increases when the welding is developed on

large thickness plates, in which are necessary to apply a controlled sequence of welding beads (multi

pass welding). This paper presents an analysis by finite element method of the evolution in the thermal

history, microstructure and strain produced by a multipass Gas Metal arc welding process, applied to

the welded joint of Hardox 400 and ASTM 514 plates. Besides this a comparison between the

analytical results and experimental data was made, and it was found that this method can be efficiently

used to accurately determine appropriate welding parameters of such components.

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Welding; GMAW; FEM analysis; Mining industry INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA DE MATERIALES

Effect of Nd:YAG Laser Welding Process Parameters on Al4C3 Formation in Advanced Aluminum Graphite Composites

EDGAR DANIEL AGUILAR CORTES FELIPE DE JESUS GARCIA VAZQUEZ JORGE LEOBARDO ACEVEDO DAVILA FRANCISCO CEPEDA RODRIGUEZ MARTIN IGNACIO PECH CANUL (2012)

Aluminum/Graphite composites (Al/C composites) have the advantages of Al (light weight, easy

machinability and good heat conduction) in combination with the advantages of C whiskers (High

Young’s Modulus, small to negative CTE, high tensile strength and high thermal conductivity).

However, Metallographic analysis, EDX and microhardness profile revealed that fibers react with

molten aluminum to form the detrimental Al4C3 phase in the HAZ and fusion zone. In order to gain

information about temperature transformation and formation conditions, scanning electron microscopy,

and termochemistry analysis were used. For experiments, were used power density (I), pulse width (t),

frequency (F), travel speed (S) and filler material (M) as independent variables. Thereby, was found

that the main process variables that influence the formation of Al4C3 are pulse duration and welding

speed, and that the effect of these variables cannot be explained only by using a thermodynamic model,

requiring a subsequent kinetic analysis.

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Laser welding; Aluminum/Graphite composites; Al4C3 INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA INDUSTRIAL

Thermo-mechanic and Microstructural Analysis of an Underwater Welding Joint

PEDRO HERNANDEZ GUTIERREZ FRANCISCO CEPEDA RODRIGUEZ JOSE JORGE RUIZ MONDRAGON JORGE LEOBARDO ACEVEDO DAVILA MARTHA PATRICIA GUERRERO MATA CARLOS ALBERTO GUEVARA CHAVEZ (2016)

The aim of this research is to present a comparative analysis between theoretical and experimental thermal fields as well as a microstructural behaviour and residual stresses applying multiple weld beads in the joint of two API 5L X52 pipe sections. The thermal field, microstructural and residual stresses were numerically modelled through the finite element method (FEM) and compared to experimentally. The simulation conditions used in the FEM analysis were similar considerations to the underwater welding conditions. The finite element analysis was carried out, first by a non-linear transient thermal analysis for obtaining the global temperature history generated during the underwater welding process. Subsequently, a microstructural behaviour was determined using the temperatures distribution obtained in the pipe material by calculating the structural transformations of the material during the welding process, and finally a stress analysis was developed using the temperatures obtained from the thermal analysis. It was found that this simulation method can be used efficiently to determinate with accuracy the optimum welding parameters of this kind of weld applications.

Artículo

API 5L X52; Finite element analysis; Residual stresses; Temperature field; Underwater welding INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA INDUSTRIAL

Co-based alloy brazing incorporating tungsten nanoparticles

MARCELA NOHEMI IBARRA CASTRO HECTOR MANUEL HERNANDEZ GARCIA JOSE MANUEL ALMANZA ROBLES RITA MUÑOZ ARROYO JORGE LEOBARDO ACEVEDO DAVILA CARLOS ALBERTO GUEVARA CHAVEZ LOURDES SANTIAGO BAUTISTA (2015)

Tungsten nanoparticles (NP's) were impregnated in fractured samples of a Co-based alloy in order to evaluate their effect over the microstructure of the joint during a brazing process. The structure and morphology of the tungsten NP's were characterized by high resolution transmission electron microscopy (TEM). The brazing filler metal selected for this work was Nicrobraz 210 and it was characterized by scanning electron microscopy (SEM) and Spectrometry X-Ray Fluorescence. Cracks were generated in Co-based alloy rectangular samples of 10 mm x 10mm x 60 mm by bending them with a mechanical testing machine; these fractures were inspected by SEM. For the impregnation of the cracks with NP's, a mixture of 0.5 g of tungsten NP's in 100 ml of ethanol was sonicated for 15 min. This sonicating time promotes the diffusion of tungsten inside the microcracks. The 210-S filler metal was used in the cracked samples with and without tungsten NP's impregnation. The brazing process was conducted in a sealed tube furnace under an Ar gas flow at 1200 °C for 60 min.Brazed samples were analyzed by optical microscope and SEM. The interaction of tungsten nanoparticles with the metallic filler in the melting zone modified the size and the morphology of the formed phases into a finer and uniformly distributed microstructure.

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modificación de materiales por nanopartículas INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA DE MATERIALES

304 stainless steel brazing incorporating tungsten nanoparticles

HECTOR MANUEL HERNANDEZ GARCIA MARTIN IGNACIO PECH CANUL RITA MUÑOZ ARROYO ARTURO ISAIAS MARTINEZ ENRIQUEZ JORGE LEOBARDO ACEVEDO DAVILA MANUEL DE JESUS CASTRO ROMAN FELIPE ARTURO REYES VALDES (2015)

tTungsten nanoparticles of 80 nm average particle size were utilized in the brazing of 304 stainless-steels.The nanoparticles were characterized by DTA and TEM, and the brazed samples were evaluated by SEMand Vickers microhardness tests. The interaction of the tungsten nanoparticles with the metallic fillerin the melting zone modified the size and morphology of the formed phases into a finer and uniformlydistributed microstructure. In samples treated at 1200◦C for 60 min, the microhardness decreased from310 to 170 HV, being the latter value, close to that of the base metal. The nanoparticles and the microcracksdevelop a synergistic effect when they are in contact with the liquid phase in such a way that a rise inthe threshold capillary-pressure leads to the filling of the interstices. The capillary-like system resultingfrom the wettability of the nanoparticles and microcrack surfaces by the liquid phase, leads to a solidifiedmicrostructure with fine and uniform phase distribution.

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NANOPARTÍCULAS INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA DE MATERIALES