Engineering Commons^™

Predicting Creep In An Alloy 617 Pressure Vessel Using Uniaxial Bar Test Data, Justin Allen, Allyssa Bateman, Yudhishthir Bhetwal, Theodora Caldwell, Joseph Croteau, Elias Lindau

College of Engineering Poster Presentations

Alloy 617 is being investigated as a candidate for application in next generation nuclear plants (NGNPs), including the very high temperature reactor (VHTR). Creep deformation concerns the lifetime and failure of heat exchangers used at the very high operating temperatures and pressures of such plants. In order to meet the American Society of Mechanical Engineers’ Boiler and Pressure Vessel code (ASME B&PV), and be certified for use in NGNPs, a thorough understanding of creep must be demonstrated. Current methods of testing creep have limitations and there remains uncertainty and controversy as to the applicability of these tests to more complex …

Use Of Global Electrochemical Techniques To Characterize Localized Corrosion Behavior On Aluminum Alloys, Joe Croteau, Kerry N. Allahar, Darryl P. Butt, Michael F. Hurley

College of Engineering Poster Presentations

Precipitated intermetallic phases strengthen aluminum aircraft alloys; these inclusions also establish localized electrochemical environments, significantly influencing the bulk corrosion behavior of such alloys. To gain insight on the effects of intermetallic phases on the bulk corrosion behavior, two established forms of electrochemical characterization techniques were used, polarization scans and impedance spectroscopy. This effort was undertaken to:

• Provide a statistical body of electrochemical data for aluminum alloys,
• Provide fundamental electrochemical parameters to aide in a continuum scale modeling effort,
• Validate the effect of solution chemistry on bulk corrosion behavior,
• Determine the influence of precipitated intermetallic phases on the bulk corrosion behavior, …

Repairing Mixed-Conducting, Ceramic Electrolyte Films, Kevin Tolman, Izaak Williamson, Kokfoong Chan

College of Engineering Poster Presentations

Ceramatec, Inc. develops ceramic-electrolyte thin films for gas separation/purification technologies. Specific ions (e.g., oxygen) can be selectively diffused through these films in order to obtain a desired product, such as syngas or pure O2. During production, residual stresses develop within the films which induce defects, such as pinholes, micro-cracks, and other sources of leaks, that allow gas contamination. To improve large-scale film production yield, four application techniques were analyzed for their feasibility of restoring the integrity of the films. Controlled, uniform defects were introduced to the films using a microindenter to enable an effective comparison of application techniques …

Particle Size Characterization Of Ferritic Oxide Dispersion Strengthened Alloy Powders, Sumit R. Tamrakar

College of Engineering Poster Presentations

Ferritic oxide dispersion strengthened (ODS) alloys are candidate materials for use in extreme applications due to their excellent high temperature strength. Fe₈₁Cr₁₆Mo₃ and Fe₈₁Cr₁₆Al₃ alloys were ball milled for various durations with 0.5 wt. % Y₂O₃ nanometer sized particles prior to consolidation via spark plasma sintering (SPS). The particle size characterization was completed using optical microscopy, scanning electron microscopy (SEM), and laser scattering. The median particle size of Fe₈₁Cr₁₆Mo₃₊0.5 wt. % Y₂O₃ powder increased from 9µm to 31µm …

Versatile In-Situ Engine Lubricant Health Sensor, Sanjeev Acharya

College of Engineering Poster Presentations

Lubricants which are used in engines to reduce friction, promote engine cooling, and prevent corrosion degrade with time under harsh engine operating conditions and hence need to be changed periodically. Since degradation of oil is a result of number of mechanisms such as; engine component wear, oil oxidation, water ingress, and carbon particles, a versatile and microscopic in-situ sensor that can sense quality of wide variety of engine lubricant brands at various temperatures and pressures is of great need. This problem can be resolved by applying portable interdigitated micro-sensors to examine the impedance behavior of degraded lubricants through electrochemical tests. …

Minimization Of Surface Impurities In Anodized Aluminum, Logan Ward, Steven Livers, Amber Huddleston

College of Engineering Poster Presentations

Anodized aluminum is commonly used to create wear-resistant parts for process tools used in the semiconductor industry. Sinc microchips require high purity manufacturing environments[1], surface impurities on tooling needs to be minimized.

It has been determined that anodized aluminum parts are one source of contamination. This project investigates the source of trace elements in anodized aluminum 6061 parts and ways to reduce them.