2021 Technical Division Student Poster Contest: MPMD 2021 Technical Division Graduate Student Poster Contest
Program Organizers: TMS Administration
Monday 5:30 PM
March 15, 2021
Room: RM 9
Location: TMS2021 Virtual
Comparison of Laser Diffraction and Image Analysis Techniques for Particle Size-Shape Characterization in Additive Manufacturing Applications: Jack Grubbs1; Kyle Tsaknopoulos1; Christopher Massar1; Caitlin Walde2; Aaron Birt2; Danielle Cote1; 1Worcester Polytechnic Institute; 2Solvus Global
Powder-based additive manufacturing (AM) technologies are capable of producing high-performance parts for a diverse set of applications. Many AM processes, such as cold spray, require specific tolerances on the feedstock powder utilized in order to be successful, necessitating accurate and precise measurements of feedstock particle size distribution (PSD) and morphology. This study investigates the validity of several powder PSD and morphology measurement methods, including laser diffraction and image analysis techniques, for AM applications. Four AM powder specimens of varying size and shape were tested using different procedures at both the commercial and university research levels to compare the influence of data collection method on reported powder characteristics. Trends in PSD were further analyzed upon testing a blend of calibration standards with a fixed distribution. Results indicate differences between data procurement techniques, emphasizing the importance of how PSD and morphology are measured and interpreted in the context of AM.
Investigation of Mechanical Properties and Microstructure in Additively Manufactured Austenitic 316L Stainless Steel: Hussam Ali1; Nicholas Brubaker1; Nicolene Van Rooyen1; Indrajit Charit1; Michael Maughan1; Mark Jaster2; 1University of Idaho; 2Premier Technology
Additive manufacturing (AM) has shown improvement in terms of affordability, sustainability, waste reduction and energy saving. In this study, laser-based direct energy deposition was used at Premier Technology Inc. to build austenitic 316L stainless steel parts with specific geometries for various applications. Wires of austenitic 316L stainless steel were utilized to build the parts under argon gas environment. Density was measured following Archimedean principle, microhardness was measured using Vickers microhardness testing, and strength and ductility properties were evaluated via tensile testing. Nanohardness and modulus mapping were performed using nanoindentation technique to obtain localized gradient in mechanical properties. Microstructure was characterized using optical and scanning/transmission electron microscopy to correlate the obtained mechanical properties to the observed microstructure. The obtained mechanical properties are found to be comparable to those of conventionally manufactured 316L. The research is supported by the Idaho Global Entrepreneurial Mission (IGEM) Program of the Idaho Department of Commerce.
Mechanical and Microstructural Properties of FeCrAl Accident Tolerant Fuels Cladding Subjected to Flow Boiling CHF Testing: Rajnikant Umretiya1; Donghwi Lee2; Mark Anderson2; Raul Rebak3; Jessika Rojas1; 1Virginia Commonwealth University; 2Universty of Wisconsin-Madison; 3GE Global Research
Enhanced Accident Tolerant Fuels (ATFs) systems for light water reactors require high-temperature oxidation resistance in steam environments compared to the current UO2 – zirconium fuel system. The Critical Heat Flux (CHF) is an important aspect of the thermal-hydraulic performance that needs to be investigated to safety margins, where materials’ surface parameters have evidenced to affect it. This work investigates the surface characteristics, microstructure, and mechanical properties of several FeCrAl alloy ATF candidates before and after flow boiling experiments. Surface characteristics were studied using different material characterization techniques such as contact profilometry, AFM, contact angle goniometry, among others. After CHF tests the average microhardness value was increased by 10-15% that was confirmed with higher mechanical properties acquired by ring compression testing. Furthermore, after CHF testing, the oxide formation was studied using XPS and TEM analysis.
Micro-structure Dependent Nano-scratch Behavior in Additively Manufactured Inconel 718: Mustafa Rifat1; Saurabh Basu1; 1Penn State University
Surface finishing of Additively Manufactured (AM) parts is necessary for smoothing as-built roughness textures. Finishing processes often rely on the localized deformation of surface. Herein, a better understanding of the deformation behavior of surficial grains is required to optimize these finishing processes. In this study, nano-scratch tests are performed in Direct Metal Laser Sintered (DMLS) Inconel 718 components. It is shown that pile-up behavior of the scratches is correlated with the distance of grains from the surface (d) and Taylor Factor (M) of the grains. Mechanistic origins of this behavior are pursued in the as-built microstructure characteristics, viz. grain boundaries and the preexisting dislocation density in the scratch zones. Microstructure and nanoscratch profiles were characterized using Orientation Imaging Microscopy (OIM) and Atomic Force Microscopy (AFM), respectively. The experiments were supplemented by a preliminary Finite Element Analysis based nanoscratch model in ABAQUS.