A5016329402- Microstructure and Mechanical Properties of Steels
- Metal Alloys Wear and Properties
- Metal and Thin Film Mechanics
- Advanced machining processes and optimization
- Microstructure and mechanical properties
- Advanced Surface Polishing Techniques
- Metallurgy and Material Forming
- Metal Forming Simulation Techniques
- Natural Fiber Reinforced Composites
- Advanced Machining and Optimization Techniques
- Fatigue and fracture mechanics
- Hydrogen embrittlement and corrosion behaviors in metals
- Electrospun Nanofibers in Biomedical Applications
- Aluminum Alloys Composites Properties
- Textile materials and evaluations
- High-Velocity Impact and Material Behavior
- Engineering Education and Curriculum Development
- Knowledge Societies in the 21st Century
- Educational Research and Science Teaching
- Welding Techniques and Residual Stresses
- Advanced Power Generation Technologies
- Banana Cultivation and Research
- Nanocomposite Films for Food Packaging
- Engineering Applied Research
- Soil Science and Environmental Management
Universidad Nacional de Colombia
2012-2023
John Wiley & Sons (Germany)
2021
Polytechnic University of Puerto Rico
2011
Universitat Politècnica de Catalunya
2008
This work analyses the effect of alkali treatment on mechanical properties banana fibre (Musa Paradisiaca). Fibres were extracted from pseudostem by a defibring machine; they mercerised and modified 5% NaOH (w/v) treatment. Morphological characterisation showed that treated fibres' surface was rougher than untreated fibres. Mechanical indicated Young's modulus, ultimate tensile strength strain became decreased increasing both diameter.
The scope of this work is the analysis damage evolution and microstructural fracture mechanisms dual‐phase steels through quasi‐static uniaxial cyclic tensile tests, considering influence volume fraction distribution martensite. samples are intercritically annealed at different temperatures to obtain three martensite fractions (MVF). Damage evaluated as a function stiffness loss. show lower ductility strength under loading conditions. hardening rate affected by MVF in stages deformation. A...
The influence of Martensite Volume Fraction (MVF) on fracture mechanisms in a Dual Phase steel with two different grain sizes was studied this work.Ferrite-Martensite microstructure obtained by an intercritical heat treatment for both groups sizes.The results show direct relationship between higher temperature during the and increase MVF.The fine MVF presents high tensile strength good ductility.Furthermore, relation to material behavior under impact conditions, refinement values promote...
Abstract The effect of different microstructural factors on crack growth and fatigue fracture mechanisms in dual‐phase (DP) steels has yet to be fully understood. present research examines the relationship between growth, microstructure, mechanisms. samples were intercritically annealed at temperatures produce three martensite volume fractions (MVFs). results show that mechanical incompatibility ferrite promotes continuous tip deflection. MVF increases are associated with elevated...
Las pruebas de impacto son una importante herramienta para la obtención importantes propiedades, como tenacidad al y temperatura transición ductil-fragil, selección un material en diseño mecánico. Se evaluó mediante Charpy acero fase doble (ferrita-perlita) 10 mm espesor a temperaturas que oscilan entre 90 ºC -60 ºC. superficies fractura fueron analizadas por microscopio óptico (MO). Debido alta dispersión, mostrada los resultados, se emplaron numerosas las mismas condiciones el uso métodos...
The influence of Martensite Volume Fraction (MVF) on fracture mechanisms in a Dual Phase steel with two different grain sizes was studied this work.Ferrite-Martensite microstructure obtained by an intercritical heat treatment for both groups sizes.The results show direct relationship between higher temperature during the and increase MVF.The fine MVF presents high tensile strength good ductility.Furthermore, relation to material behavior under impact conditions, refinement values promote...
En este artículo se discuten las tres rutas diferentes de tratamientos térmicos y termomecánicos para ser utilizados en la obtención un acero fase dual (ferrita-martensita), a partir modificación microestructural bajo carbono AISI/SAE 8620. Se explican variables proceso cada una empleadas. La caracterización del material realizó mediante microscopia óptica electrónica barrido mecánica ensayos dureza, tracción uniaxial, impacto doblado. Los resultados muestran que el tratamiento temple...
Crack growth resistance in dual-phase steel was studied. The dual phase microstructure modified through heat treatments to increase the martensite volume fraction from 10% 40%. as-received and heat-treated samples were evaluated using a uniaxial tensile test, fatigue crack fracture toughness test. Extended Finite Element Method (XFEM) used simulate compact tension test specimens. results showed that an is effective way under different load conditions, quasistatics dynamic, increasing...
The effects of process variables on weld quality are being studied for the Flash Butt Welding SPFH 590 steel. resulting welded metal and heat affected zones were characterized by tensile testing, bending Rockwell hardness testing microstructural analyzed optical microscopy, scanning electron microscopy. results indicated a transformation joint from ferrite laminar to acicular ferrite. During welding process, long-shaped grains grew became rounded-shaped, through cooling some side plate...
This paper study the synthesis and mechanical characterisation of steel (0.6% C) having lower than 1-micron grain size. There was severe plastic deformation in high pressure planetary ball milling consolidation for obtaining bulk samples at temperatures between 350°C 500°C. Studying size evolution showed that without subsequent heat treatment retained their nanocrystalline structure. Grain growth controlled heat-treated due to many nucleation points presence cementite precipitates. The...
A study on the effect of vacuum assisted resin transfer moulding (VARTM) manufacturing process mechanical properties cotton/epoxy composite is presented in this investigation. Woven cotton was used as reinforcing material embedded epoxy resin. The woven treated with sodium hydroxide for one hour at concentrations 0% to 20%. tensile test showed that untreated had highest ultimate strength and Young’s modulus. Observation fracture surface by scan electronic microscopy (SEM) compared hand...
Influencia del proceso de revenido en el comportamiento
This study investigates the effect of continuous cooling treatment on impact toughness and ductile-brittle transition temperature a low carbon ferrite-pearlite dual-phase steel.Impact testing was performed according to ASTM E23 at temperatures ranging from -60ºC 90ºC. The results indicate significant increase in approximately 64% areduction 50ºC as-received condition 0ºC after heat treatment. These changes were analyzed through microstructural examination fractographic analysis. A bainitic...
The aim of this paper is to provide a general overview nanocrystalline and ultra-fine grain material production using severe plastic deformation (SPD), being one the most active research fields in mechanical processing materials. gives an explanation more important SPD techniques (mechanical milling, equal channel angular pressing, high pressure torsion, extrusion-compression accumulated roll-bond) as regards fundamental principles, advantages limitations. Some experimental results for iron...
The goal of this article is to provide a general overview about Severe Plastic Deformation processes SPD, one the most important techniques available obtain industrial amounts materials with grain size lower than 1µm, called ultrafine UFG. A description more SPD made, based on fundamental principles, advantages and limitations each them. These are presented considering remarkable increase physics mechanicals properties in comparison conventional metallic materials. Some potential...
Resumen-Este artículo presenta la caracterización estructural y mecánica sobre un acero con efecto TRIP (Transformation Induced Plasticity-transformación inducida por plasticidad).El estudio comprende análisis microestructural detallado su influencia ante ensayos de doblado, esfuerzo-deformación fractura.Los resultados muestran que el alto valor del esfuerzo a fluencia una capacidad endurecimiento muy limitada se deben al contenido carbón alta fracción fase martensita inicial proceso...
Dual-phase (DP) sheet steels are used in the automotive industry.They have a microstructure that consists of ferrite matrix with dispersed martensite islands giving combination good formability and high strength.However, they also exhibit ductile failure caused mainly by strain incompatibility both phases, which continues to be an issue discussion among researchers.To capture mechanical degradation DP steel, this research focuses on damage characterization using continuum model...
This work proposes a simulation approach to characterize the behavior of DP600 steel subjected micro indentation tests. Axisymmetric and three-dimensional artificial RVEs were generated with statistical data from metallographic images. FEM simulations tests used Gurson model Rodriguez-Gutierrez equation. There is proposed new parameter called spherical radius quantify closeness hard particles indenter tip. The simulated 3D curves compared respect reference curve DP600, obtaining relative...
The influence of Nb on the microstructure during annealing at 950, 1000, and 1100 °C is analyzed in two types twinning‐induced plasticity (TWIP) steels, Fe–25Mn–12Cr–C–N (TWIP‐0) Fe–25Mn–12Cr–C–N–Nb (TWIP‐Nb). addition as a microalloying element affects various phenomena taking place annealing, namely, recrystallization, grain coarsening, recovery processes. Microstructural characterization conducted via light microscopy, scanning electron back scattering diffraction (EBSD). Recovery takes...
El interés de los fabricantes automóviles en reducir el peso las partes estructurales del vehículo para satisfacer políticas consumo combustible y mejorar la seguridad colisiones, han llevado búsqueda nuevos materiales, hallando una gran oportunidad aceros avanzados alta resistencia “AHSS”, como acero doble fase. Sin embargo, proceso conformado varios componentes chapa metálica fase, fenómeno recuperación elástica es uno problemas más comunes. En presente estudio, se analiza conformabilidad...
The research calculates the rolling process conditions in a 3-roll bending machine. Initially, structure and mechanical properties of highstrength steel to be processed are determined an experimental manner. Then, equations that allow determining relationship between thickness width bent established, taking into consideration strength features Finally, some graphs help achieving efficient adequate processing presented, choosing width/height required for plate forming, according its...
Actualmente los productos desarrollados para la industria, deben tener propiedades mecánicas adecuadas, y así cumplir con las expectativas de diseñadores o fabricantes productos. Por esta razón industria colombiana está en búsqueda implementar desarrollar procesos tales como pulvimetalurgia, elaborar elementos mecánicos dichas propiedades. Mediante investigación se desarrolló un proceso caracterización material compuesto metal cerámico, Hierro – Óxido Itria, por medio del análisis...