Barrett

Barrett, The Honors College at Arizona State University proudly showcases the work of undergraduate honors students by sharing this collection exclusively with the ASU community.

Barrett accepts high performing, academically engaged undergraduate students and works with them in collaboration with all of the other academic units at Arizona State University. All Barrett students complete a thesis or creative project which is an opportunity to explore an intellectual interest and produce an original piece of scholarly research. The thesis or creative project is supervised and defended in front of a faculty committee. Students are able to engage with professors who are nationally recognized in their fields and committed to working with honors students. Completing a Barrett thesis or creative project is an opportunity for undergraduate honors students to contribute to the ASU academic community in a meaningful way.

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Effect of Powder Recycling on Direct-Metal-Laser-Sintered Aerospace Alloy

Description
This project sought to analyze the effects of recycling Inconel 718 powder for Direct Metal Laser Sintering (DMSL) for additive manufacturing by testing low cycle fatigue tensile samples ranging from virgin to ten times recycled. Fracture generally occurs at the sample surface where persistent slip planes form and accumulate to…

This project sought to analyze the effects of recycling Inconel 718 powder for Direct Metal Laser Sintering (DMSL) for additive manufacturing by testing low cycle fatigue tensile samples ranging from virgin to ten times recycled. Fracture generally occurs at the sample surface where persistent slip planes form and accumulate to cause a sudden fracture leading to signature markings for various phases of crack growth. Effects caused by contamination would be found in the first region of crack growth at the initiation site as the cause stress concentration. Tensile strength and fatigue life were compared to initiation site size found from fracture images obtained using scanning electron microscope imaging which found no significant deviations from the expected surface cracking and LCF region of slip plane buildups. Contamination was not found at any initiation site indicating that fracture life was not impacted by the amount of powder recycling. LCF life ranged from 60,000 to 250,000 which the majority experiencing fractures near 120,000 cyclic loadings. If defect effects were to be found than the low fatigue life sample would exhibit them however its fracture surface did not exhibit contamination but a slight increase in porosity found in the phase III cracking region. The In 718 powders were also analyzed to determine that the primary powder contaminates were brush fibers used to sweep away unused powders during processing however these were not seen in the final DMLS samples.
ContributorsLaws, Alec Ky (Author) / Tasooji, Amaneh (Thesis director) / Eylon, Daniel (Committee member) / Materials Science and Engineering Program (Contributor) / Mechanical and Aerospace Engineering Program (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05