A5027693864- Additive Manufacturing Materials and Processes
- Additive Manufacturing and 3D Printing Technologies
- High Entropy Alloys Studies
- Welding Techniques and Residual Stresses
- Thermography and Photoacoustic Techniques
- Manufacturing Process and Optimization
- High-Temperature Coating Behaviors
- Advanced materials and composites
- Advanced Machining and Optimization Techniques
- Respiratory Support and Mechanisms
- Fire effects on concrete materials
- Microstructure and Mechanical Properties of Steels
- Ultrasonics and Acoustic Wave Propagation
- Oral and Maxillofacial Pathology
- Laser Material Processing Techniques
- Hydrogen embrittlement and corrosion behaviors in metals
- Non-Destructive Testing Techniques
- 3D IC and TSV technologies
- Electronic Packaging and Soldering Technologies
- Aluminum Alloys Composites Properties
- COVID-19 diagnosis using AI
- Copper Interconnects and Reliability
- dental development and anomalies
- Bone and Dental Protein Studies
Universidade Nova de Lisboa
2019-2023
Weatherford College
2021
Brigham Young University
2013
In this work, a 316L stainless steel to Inconel 625 functionally graded material (FGM) was built using different deposition strategies (named as direct and smooth-type interfaces) by Twin-Wire Arc Additive Manufacturing (T-WAAM). This combination of materials is interest in chemical plants, oil & gas, nuclear applications, where high corrosion wear resistance are essential requirements. Although these properties superior 625, replacing with strategic regions structural components can reduce...
The AlCoCrFeNi2.1 eutectic high entropy alloy is of great interest due to its unique mechanical properties combining both strength and plasticity. Here, gas tungsten arc welding was performed for the first time on an as-cast alloy. microstructural evolution welded joints assessed by electron microscopy with backscatter diffraction, synchrotron X-ray diffraction analysis thermodynamic calculations. Microhardness mapping tensile testing coupled digital image correlation were used investigate...
Weldability studies on high entropy alloys are still relatively scarce, delaying the deployment of these materials into real-life applications. Thus, there is an urgent need for in-depth weldability novel advanced engineering alloys. In current work, as-cast Fe42Mn28Co10Cr15Si5 metastable alloy was welded first time using gas tungsten arc welding. The weld thermal cycle effect microstructure evolution over joint examined electron microscopy in combination with backscatter diffraction,...
In this study, we propose a new variant of wire and arc additive manufacturing (WAAM) based on hot forging. During WAAM, the material is locally forged immediately after deposition, in-situ viscoplastic deformation occurs at high temperatures. subsequent layer recrystallization previous solidification structure that refines microstructure. Because its similarity with forging, was named forging (HF-WAAM). A customized WAAM torch developed, manufactured, tested in production samples AISI316L...
The effect of heat treatments on wire and arc additively manufactured Inconel 625 parts was investigated using in situ synchrotron X-ray diffraction hardness testing. As-built samples revealed the presence a γ-matrix with precipitation γ′, γ′′ MC carbides. When treated at 750°C for 4 h, phase precipitated increasing by 5%. In observations that treating 870°C 1 h resulted δ-phase precipitation. Two different second-stage temperatures were tested (1050°C 1150°C), which dissolved while carbides...
Wire and arc additive manufacturing of high‐strength low‐alloy steel is performed. The microstructures mechanical properties the samples are investigated correlated with process heat input. Continuous pulsed wave welding modes studied added material efficiencies determined. microstructural characterization microhardness test reveal that input effect more impactful when parts produced mode. Microstrain evolution phase fraction evaluated via synchrotron X‐ray diffraction. A higher percentage...
Defect detection in additive manufacturing (AM) is of paramount importance to improve the reliability products. Nondestructive testing not yet widely used for defect detection. The main challenges are a lack standards and methods, types location defects, complex geometry many parts. During selective laser melting (SLM), several defects can occur such as porosity, cracking, fusion. In this study, nondestructive tests were conducted highly shaped part AISI 316L stainless steel with real...
Additive manufacturing technologies are becoming more popular, as they allow the fabrication of specific parts with complex geometries not achievable by conventional manufacturing. In metal additive manufacturing, one most widely used is laser powder bed fusion. This work focuses on influence different processing parameters density AISI 316L stainless obtained through this technology. The article presents a review published works deposition steel using fusion to define an optimal range...
CuAl8 alloy finds applications in industrial components, where a good anti-corrosion and anti-wearing properties are required. The has medium strength toughness with an elongation to fracture at room temperature of about 40%. Additionally, it electrical conductivity, though lower than that pure Al or Cu. Despite these characteristics, additive manufacturing the was not yet reported. In this work, direct energy deposition-arc (DED-arc) without in-situ hot forging used determine microstructure...
Various integrated circuit bond pad structures in aluminum-silicon dioxide (Al-SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) metallization are modeled, with ball bonding stresses applied static or dynamic simulations. This work follows from our EPTC 2012 paper. Of special interest is the apparent stress reduction pads that mitigates top SiO film cracking during wirebond of ON Semiconductor's more robust and under (CUP) having...
We present a viable prototype of simple mechanical ventilator intended as last resort to ventilate COVID-19 patients. The implements the pressure-controlled continuous mandatory ventilation mode (PC-CMV) with settable breathing rates, inspiration/expiration time ratios and FiO2 modulation. Although safe, design aims minimize use technical components those used are common in industry, so its construction may be possible times logistical shortage or disruption areas reduced access materials at...
Abstract Wire and Arc Additive Manufacturing (WAAM) is increasingly being used to produce complex non-traditional geometries that other technologies are not able create. Finishing operations, as machining, often required accomplish the components functionality. However, recent studies suggest several machining issues arise due lack of geometrical tolerances shapes manufactured parts, like chattering effects, appropriate work holding selection component alignment. This aimed evaluate if...