Edwan Anderson Ariza Echeverri

• Professor at University of Magdalena

Fire-Resistant Steels (FRS) are widely used to ensure building stability during fire incidents, enabling safe evacuation. In this study, a FRS alloyed with Nb, Mo, B, and Ti was cast, thermomechanically processed, and air-cooled to achieve the “as received” condition. The yield strength (YS) was evaluated through tensile tests at room temperature (...

This study investigates the tribological performance of two hot-work tool steels, AISI H13 and VTM Plus, under conditions representative of hot stamping die operation. Using a 2³ full factorial design, the effects of tool steel type, counterbody hardness (45 and 60 HRC), and contact temperature (75 °C and 200 °C) were evaluated in terms of friction...

The modern technological applicability of materials depends substantially on their structural and physical properties. In the area of spintronics, materials design focuses on attributes such as multiferroicity, colossal magnetoresistance, ferromagnetism in semiconductors and half-metallicity, among others, which are conducive to the development of...

Digital twin (DT) technology is transforming industrial automation by enabling the real-time simulation, predictive control, and optimization of complex systems. This study presents a DT-based kinematic control method designed for trajectory planning and execution in a 2RRR planar parallel manipulator. The framework utilizes ROS/Gazebo for virtual...

This study introduces a robust offline system for 2D indoor navigation, developed to address common challenges such as complex layouts and connectivity constraints in diverse environments. The system leverages advanced spatial modeling techniques to optimize pathfinding and resource efficiency. Utilizing a structured development process, the propos...

The pollution of the oceans by plastic waste is one of the major environmental problems of our time. It is estimated that there are millions of tons of polymers floating on the surface of the oceans, concentrated in several large plastic accumulations so-called plastic islands. The main consequence of marine plastic pollution is the negative impact...

This study addresses the critical issue of mathematical underperformance among preschoolers in Yopal Casanare, Colombia, through the perspective of an action research project. It focuses on the design and implementation of a didactic unit aimed at promoting numerical thinking, specifically seriation and structured counting, in preschool students. T...

This study aims to explore the impact of various infill patterns on the mechanical properties of 3D-printed polylactic acid (PLA) specimens, particularly focusing on the minimum cross-sectional area, which correlates with mechanical strength. A randomized controlled trial design was employed, testing four different infill patterns: concentric, gyro...

In this study, we employed the Pearson product-moment correlation coefficient (r) to identify non-composite vortex states in a two-band superconducting slab. The fractional vortices were simulated using the two-component Ginzburg–Landau equations TDGL, with the link variable method and the healing coupling between the superconducting bands. The coe...

A well-designed complex microstructure containing both soft and hard micro-constituents can enhance the mechanical properties of steel. In this study, commercial AISI 9254 steel was annealed at 900 °C, rapidly cooled to 550 °C for 500 s to promote approximately 50% fine pearlitic transformation, quenched to 125 °C for partial martensitic transforma...

Geometric reasoning is an indispensable skill within the domain of civil engineering, where professionals are required to comprehend and manipulate geometric figures for the creation of stable and functional structures. This paper evaluates the geometric reasoning abilities of four groups of civil engineering students who engaged with a complex geo...

High-strength low-alloy (HSLA) steels are widely used in the oil industry for manufacturing durable and efficient pipelines due to their exceptional mechanical properties, including high strength, toughness, ductility, and weldability. However, their long-term reliability in sour gas environments remains a critical concern, particularly due to thei...

Wastewater treatment is a critical process for ensuring water quality and public health, particularly in the context of increasing environmental challenges such as pollution and water scarcity. Artificial intelligence (AI) has emerged as a transformative technology capable of optimizing various wastewater treatment processes, such as contaminant re...

The aim of this study was to assess the impact of rail metallurgy, focusing on segregations and chemical composition, and welding parameterization on the quality and susceptibility of welds to defects and failures induced by mobile flash butt welding (FBW). Ten welds were performed using two different welding programs, with varying heat input, on p...

Thermal cycle (welding simulations) at the inter-critical region were performed on an Si and V micro-alloyed (not heat-treated) rail steel. The beginning of austenitization temperature (Ac1) in the micro-alloyed rail steel occurred significantly above that observed in an alternative heat-treated rail steel. Very little pearlite alteration was obser...

Purpose: This study aims to enhance production quality by applying Quality Control (QC) principles through acceptance sampling, specifically analyzing the efficacy of attribute acceptance sampling plans in final lot receptions.Design/methodology/approach: Through a comprehensive review and critical evaluation of various sampling methodologies found...

In the context of mathematics education, the integration of artificial intelligence (AI) in teaching calculus is revolutionizing instructional methodologies and enhancing learning experiences both inside and outside the classroom. This study explores the use of specific AI tools, including ChatGPT, MathGPT, Gemini, and Wolfram Alpha, to deepen stud...

This study investigates the correlation among cooling rates, boron addition, and their subsequent effects on the microstructure and mechanical properties of niobium microalloyed steels, specifically with an intent to develop new fire-resistant steels. Slower cooling rates enhanced the ferrite transformation and (Nb,Ti)C precipitation, promoting a s...

The physical properties of perovskite-type materials are sensitive to their chemical composition and crystallographic structure, which makes them highly versatile for various advanced technological applications. In this theoretical study, density functional theory (DFT) is employed to investigate the electronic properties of the perovskite-like mat...

In response to the digital transformation in education, this study explores the efficacy of virtual reality (VR) video games in teaching direct current electrical circuits at a public university in Colombia. Using a mixed-method action research approach, this study aimed to design, implement, and evaluate a VR-based educational strategy to enhance...

This study examines the outcomes of implementing a teaching unit that integrates problem-solving with the history of mathematics to improve fifth-grade students' understanding of fractions at an educational institution in Yopal, Colombia. Utilizing an educational action research methodology, the study commenced with a diagnostic assessment to ident...

In recent years, virtual reality (VR) technologies have become one of the teaching tools with the greatest training potential in higher education. Thus, the study of factors that influence the adoption and valuation of VR by the educational agents involved is a fruitful line of research, because it can provide keys to promote its incorporation. Thi...

This study introduces a novel methodology integrating computer vision, visual servo control, and the Kalman Filter to precisely estimate object locations for a 3-RRR planar type parallel manipulator. Through kinematic analysis and the development of a vision system using color indicators, the research enhances the ability of the manipulator to trac...

59 卷 第 3 期 2 0 2 4 年 6 月 Abstract This paper presents an innovative educational intervention aimed at enhancing numerical thinking in mathematics education through problem-solving. This study is grounded in the problem-solving framework established by Pólya in 1985, emphasizing a qualitative, descriptive approach to develop and evaluate a didactic...

This study presents a comprehensive and innovative approach to tailoring the microstructure of AISI 9254 steel using a quenching and partitioning (Q&P) process, demonstrating significant improvements in mechanical and wear properties. The initial pearlitic microstructure was first heated to the fully austenitizing region before undergoing phase tra...

This study explores a novel approach to quenching and partitioning (Q&P) heat treatment applied to AISI 9260 spring steel, comprising Fe-0.65C-1.58Mn-1.05Si-0.41Cr (wt.%). Our research focuses on balancing strength and ductility through optimized Q&P pathways, leading to a diverse microstructure that includes martensite, bainite, carbide, and retai...

To achieve the desired microstructural properties, the ongoing development and innovation in new structural steels require novel thermal processing. This study aims to improve the mechanical properties of a commercial spring carbon–silicon steel by tailoring its microstructure through a process involving quenching and partitioning (Q&P) followed by...

A new twin-disc test was performed using discs containing all microstructures of the heat-affected zone (HAZ) of flash-butt welded rails. It was observed that the lower hardness regions (spheroidized cementite in a ferritic matrix) at the HAZ boundary underwent a local deformation, generating valleys and reproducing a common defect type observed in...

High-strength low-alloy (HSLA) steels find extensive usage in the oil industry for manufacturing pipes due to their requirement for materials with high mechanical and corrosion resistance. Among these steels, the HSLA X70 steels are particularly of great interest to the petroleum industry because of its high mechanical resistance, ductility and wel...

The purpose of this article is to investigate a novel phenomenon in which a lighter object can fall faster than a heavier one in a viscous fluid, challenging traditional physics principles. We describe a new analytical approach that compares two spheres of different densities (aluminum and iron) and sizes in a less dense viscous fluid, focusing on...

In recent times, the significance of advancing road transportation technologies has notably increased. This is mainly driven by the escalating need for road transportation systems that are not only safe but also environmentally sustainable. Moreover, enhancing fuel efficiency in road vehicles (i.e., automobiles) holds the potential to contribute si...

In the pursuit of lightweight, durable steel, we have successfully developed a multicomponent structure in AISI 9254 spring steel using a two-stage quenching and partitioning (Q&P) process. The primary objective of this process was to engineer an optimized microstructure consisting of nanobainite, martensite, and nano-carbides. Utilizing the insigh...

Currently, heavy-haul and passenger rails are joined by a welding process, which can be either flash-butt welding or thermite. The joining process has increased the overall rails strength, but the welding parameters optimization is tricky and must be performed and studied to improve the weld quality. Heavy-haul rails are high carbon steels, contain...

This study delves into the formulation of an advanced microstructure in medium-carbon high-silicon spring steel through a series of engineered heat treatments. The microstructure, composed of lower bainite, proeutectoid ferrite, and pearlite, exhibits superior mechanical properties compared to traditional pearlitic steel. Specifically, the novel mi...

Rail steels for Heavy Haul must have high resistance to deformation, wear, and rolling contact fatigue (RCF). Recently, several rail grades have been developed to perform this function. So far, a fully pearlitic matrix is the most commonly used microstructure in rail steel. The pearlitic microstructure has high mechanical strength, and outstanding...

Currently, heavy-haul and passenger rails are joined by a welding process, which can be either flash-butt welding or thermite. The joining process has increased the overall rails strength, but the welding parameters optimization is tricky and must be performed and studied to improve the weld quality. Heavy-haul rails are high carbon steels, contain...

Manganese sulfide (MnS) inclusions are non-metallic compounds formed in steel by the reaction between sulfur (S) and manganese (Mn). The formation of MnS inclusions is expected and desired during the manufacturing process of steels in which machinability is an important characteristic. During machining, such inclusions have a stress concentration e...

Fire-resistant steels have been produced and used in the civil construction aiming to reduce the use of passive fire protection in structural elements. They are reported to preserve mechanical properties up to a certain critical temperature as compared to conventional (non-fire-resistant) steels. This work presents results from experimental tests p...

To improve the performance of the rails and wheels for the railway industry, new microstructures need to be researched. Nevertheless, the soft region observed in the weld heat-affected zone (HAZ), caused by the spheroidization of cementite, leads to localized loss of hardness. A methodology for calculating the percentage of cementite spheroidizatio...

In the current research, a complex microstructure and crystallographic data were developed through quenching and partitioning (Q&P) process to improve tensile properties of commercial pearlitic carbon-silicon steel. Two-stage Q&P process, including full austenitization, quenching at 220 °C, followed by two different partitioning temperatures, was a...

Continued development and innovation in the new structural steels are required to introduce novel thermal processing to set desired microstructural properties. This study aimed to improve the mechanical properties of a commercial spring carbon-silicon steel by tailoring the microstructure using a quenching and partitioning process followed by baini...

o introduce desired microstructural properties, continued development and innovation in new structural steels require novel thermal processing. This study aims to enhance the mechanical properties of a commercial spring carbon-silicon steel by tailoring its microstructure through a quenching and partitioning process followed by bainitic transformat...

The long exposure of structural components to high temperatures (above 600 °C) negatively changes their mechanical properties, severely compromising the structural capacity of buildings and other structures in which safety is a primary concern. Developing new cheaper fire-resistant steels with better mechanical and thermal performances represents a...

In this work, exploratory quantitative research on the opinion of the students of a course on Geometry of Welded Joints, in an introductory welding course of secondary technical education curriculum, on the didactic use of PDF-3D in the development of the course is carried out. For this purpose, a survey designed by the authors was used, which the...

Molybdenum containing fire-resistant structural steels are available on the international market, but are much more expensive than conventional structural steels, inhibiting its use in the building industry in Brazil. Molybdenum promotes the formation of acicular microstructures, solid solution hardening, and delays secondary carbides coarsening. M...

Finite element method simulations of flash-butt welding were performed with two different physical and mechanical rail material parameters. The main objective was to study the effect of different parameters on residual stresses with fixed boundary conditions. The results showed that, even when studying the same material (rail steel), the residual s...

This paper presents quantitative research on the perception of the didactic use of virtual reality by university professors in Colombia, with special attention to the differences according to their area of knowledge, as the main variable, and gender and digital generation, as secondary variables. The study involved 204 professors from different Col...

The constant demand for increasing the strength without ductility loss and production cost encourages industrial and academic societies to propose novel heat treatment processing of commercial steel grades. To improve the mechanical properties of commercial spring steel, a novel quenching and partitioning (Q&P) processing was designed to deliver a...

In this research, stress-oriented hydrogen induced cracking (SOHIC) test was carried out on a 50 mm thickness of a commercial API 5L X70 steel plate. The evolution of microscopic features such as phase, boundary, interface, grain, and crystallographic data was analyzed before and after SOHIC, in order to comprehend the effect of crystallographic or...

The development of new fire-resistant steels represents a challenge in materials science and engineering of utmost importance. Alloying elements such as Nb and Mo are generally used to improve the strength at both room- and high-temperatures due to, for example, the formation of precipitates and harder microconstituents. In this study we show alter...

Simulations using the finite element method (FEM) were done to understand the effects of heating/cooling rates on the distribution of residual stresses. Two material parameters from rails were used while the boundary conditions remained constant: heat-affected zone size, maximum temperature and heating extraction rate. To complement the analysis, a...

A novel combined process of Cold Stamping (CS) and Hot Stamping (HS) with Quenching and Partitioning (Q&P) treatment applied to advanced TRIP-assisted steel has been conducted by thermomechanical simulation to evaluate the influence of CS or HS in the Q&P processing. With this purpose, Q&P, CSQ&P, and HSQ&P cycles were designed to obtain multiphase...

The current paper aimed to introduce a new heat treatment regarding the quenching and partitioning (Q&P) processing of tailoring desirable complex microstructure to obtain a good strength-ductility combination. First, change in length under heating and cooling of commercial eutectoid steel was studied using dilatometry to understand the kinetics of...

Understanding the kinetics of microstructural degradation during the event of a fire is of major relevance to future optimization of fire-resistant steels (FRS). In this work, we use in situ synchrotron X-ray diffraction to assess the rapid thermally-assisted degradation of different starting microstructures, such as (i) ferrite + pearlite; (ii) ba...

La Universidad Tecnológica de Pereira a través de la Vicerrectoría de Investigaciones, Innovación y Extensión tiene como propósito “Definir y direccionar los lineamientos para la investigación institucional que fortalezcan los grupos y semilleros de investigación, a través de la formación de investigadores, el desarrollo de programas o proyectos de...

Due to rigid environmental laws and the fuel efficiency goals stipulated by the Federal Government, automakers seek new processing routes to reduce the mass of vehicles without compromising their mechanical strength. The most widely used is the hot stamping of boron steels. However, after this process, the steel does not have sufficient ductility t...

A novel quenching and partitioning process (Q&P) including the hot stamping (HS) process was studied, using two stamping temperatures (750 °C and 800 °C) and two quenching temperatures (318 °C and 328 °C). This combination is here called Hot Stamping and Quenching and Partitioning process (HSQ&P). The partitioning step was performed at 400 °C for 1...

Improvement of wear resistance and mechanical performance of rails used in heavy-haul railway are essential to reduce railroad maintenance costs. A novel heat treatment based on quenching and partitioning (Q&P) processing was proposed to improve the wear resistance of a hypereutectoid pearlitic rail. 50% of austenite was transformed into martensite...

El propósito de este trabajo fue encontrar soluciones exactas de las ecuaciones de campo de Einstein para un espacio-tiempo estático con simetría axial, en ausencia de materia, para sistemas de coordenadas esféricas, prolatas y oblatas. La variación en estos sistemas de coordenadas se debe a la naturaleza geométrica que pueden tener los objetos que...

Advanced high strength steels (AHSS), with yield strengths over 300 MPa and tensile strengths exceeding 600 MPa, are becoming more noticeable in vehicle manufacturing. A novel processing route of a TRIP-assisted steel was developed. Characterization and modelling techniques were used to establish correlations between processing, microstructure and...

It is believed that texture, as the preferred crystallographic orientation of microstructuralfeatures, causes plastic anisotropy, leading to a decrease in formability. Thus, promotingrecrystallization and randomizing crystallographic texture have been the main methodsof increasing formability. The aim of the current study was to improve the tensile...

Quenching and partitioning (Q&P) and a novel combined process of hot straining (HS) and Q&P (HSQ&P) treatments have been applied to a TRIP-assisted steel in a Gleeble®3S50 thermomechanical simulator. The heat treatments involved intercritical annealing at 800 °C and a two-step Q&P heat treatment with a partitioning time of 100 seconds at 400 °C. Th...

A commercial API 5L X70 steel plate was subjected to different thermomechanical processes to propose a novel thermomechanical rolling path to achieve improved mechanical properties. Scanning electron microscopy, electron backscatter diffraction, and x-ray texture analysis were employed for microstructural characterization. The results showed that s...

The possible effects of crystallographic orientation and grain boundary distributions on fatigue crack initiation and propagation were studied in used pearlitic rail steels. Microstructure and hardness variation along the depth distance showed the effect of strain accumulation on microstructure modification. Although no evidence was shown of a corr...

The mechanical properties and grain orientation evolution have been investigated in a TRIP-assisted steel in search of enhanced strength and plasticity. A novel combined process (HSQ&P) of Hot Stamping (HS) and Quenching and Partitioning (Q&P) treatment with different initial straining temperatures has been conducted by thermo-mechanical simulation...

Hot stamping, also known as hot press forming and press hardening, is one of the effective methods to produce ultra high strength steels (UHSS) for automotive bodies. Hot stamping process in steels are mainly used in passenger safety-related anti-intrusion parts such as side impact beams, bumpers, B-pillars, roof rails, and tunnels. The use of this...

Increased requirements for low fuel consumption and improved safety in the automotive industry have stimulated the development of new generations of high strength steels. To reduce fuel consumption, weight reduction of the steel car body is required by using thinner and therefore stronger but not less ductile materials. With this purpose, the prese...

Uno de los mayores problemas en el sector industrial y que genera enormes pérdidas económicas, está relacionado con daños provocados por diferentes fenómenos, denominados tribológicos, que tienen que ver con el desgaste, la fricción, la lubricación, la fatiga, la corrosión, entre otros. Todo componente mecánico se degrada durante su vida útil, por...

O objetivo deste livro foi analisar a distribuição das tensões residuais que resultam da combinação das variações volumétricas resultantes dos gradientes térmicos e das transformações de fase que ocorrem durante a têmpera de cilindros de aço AISI/SAE 1045, 4140 e 4340. O modelo matemático usado para este objetivo utiliza o programa AC3 de modelagem...

Thermomechanical simulation of quenching, hot stamping, and quenching and partitioning processes of a high-strength TRIP-assisted steel were carried out in a Gleeble®3S50 thermo-mechanical simulator, coupled to the synchrotron X-ray diffraction line. The microstructures and mechanical properties were analyzed using Field Emission Gun Scanning Elect...

In this work, the kinetics of austenite decomposition during the application of the novels thermomechanical treatments of Quenching and Partitioning (Q&P) and Hot Stamping + Q&P on a ductile cast iron and a TRIP-assisted steel, and also duirng the application of tensile stress in a metastable austenitic steel were studied by means of in situ synchr...

Increased requirements for low fuel consumption and improved safety in the automotive industry have stimulated the development of new generations of high strength steels. To reduce fuel consumption, weight reduction of the steel car body is required by using thinner and therefore necessarily stronger and ductile. A promising way of achieving a favo...

TRIP-assisted advanced high strength steels (TRIP-AHSS) have been extensively used in the automotive industry due to its excellent combination of high strength and elongation. On the other hand, TRIP-assisted Supermartensitic Stainless Steels (SMSS) have been used as pipeline material for the petrochemical industry. These two alloys have microstruc...

A mathematical model to calculate the build-up of residual stresses during quenching of carbon (AISI 1045) and low-alloy (AISI 4140 and 4340) cylindrical steel bars is proposed. The model is implemented as a combination of the commercial software AC3 (R), to simulate the microstructure evolution, and Abaqus (R), to model the heat transfer and the e...

The aim of this work is to analyze the distribution of residual stresses resulting from combination of volumetric changes due to heat gradients and phase changes occurring during the quenching process of 4340 steel cylinder. The mathematical model used for this objective uses the AC3 program for modeling thermal treatments which provides transforma...

The aim of this work is to analyze the influence that the point of sign inversion of the thermal stress on the residual stress pattern developed during quench hardening of an AISI/SAE 4340 cylinder. A mathematical model using the results of the Ac3 software for forecasting transformation curves, cooling curves, microstructure and material hardness...

Glass rolling mill rolls operate under severe thermal stresses. Compressive and tensile stresses resulting from thermal shocks arise in short time periods. Manufacturing defects intensify thermal and mechanical stresses impairing the cylinder’s lifespan and increasing maintenance costs. The aim of the study is to analyze the cause of failure of a g...

Resumo Cilindros de laminação de vidro operam sob condições severas de solicitação térmica, suportando tensões compressivas e trativas decorrentes de choques térmicos em pequenos intervalos de tempo. A presença de eventuais defeitos de fabricação intensifica as solicitações mecânicas e térmicas tornando mais crítica a sua utilização, comprometendo...

The aim of this work is to analyze the distribution of residual stresses resulting from the combination of volumetric changes due to heat gradients and phase changes occurring during the quenching process of an AISI/SAE 4140 steel cylinder. The mathematical model used for this objective is the AC3 modeling software of thermal treatments (transforma...

The pitting corrosion resistance of a Cr-Mn-Ni austenitic stainless steel designated as 298 steel was evaluated in 3.5% NaCl aqueous solution using cyclic potentiodynamic polarization tests (CPP). The CPP tests were performed on hot rolled stainless steel samples which were solution-treated at 1010 °C, 1040 °C, 1070 °C, 1100 °C and on untreated ste...