Graduate Thesis Or Dissertation
 

Additive Manufacturing of Austenitic Oxide Dispersion Strengthened Alloy Using Powder Feedstock Gas-atomized with Elemental Yttrium via Laser Directed Energy Deposition

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/gt54kw41r

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  • This study investigates the microstructure and mechanical properties of an austenitic Oxide Dispersion Strengthened (ODS) steel produced by the Laser Directed Energy Deposition (LDED) process using powder feedstock atomized with elemental yttrium. The Microstructure of the samples was characterized by electron microscopy, and mechanical properties were measured using a tensile test and microhardness test. Further, the thermal stability of the LDED-produced ODS steels were evaluated. As-printed samples showed a cellular structure with Si-Mn-Y-O-enriched nanoparticles that were found to be amorphous. After 100 hours at 1000°C in an argon atmosphere, a partially recrystallized microstructure with a decrease in the number density of Y-O-enriched nanoparticles with crystalline structure was revealed. The as-printed (600 W, 600 mm/min) samples exhibited an ultimate tensile strength of 774 MPa and an elongation at a break of 22%. A lower ultimate tensile strength of 592 MPa and higher elongation of 42% was measured after 100 hours at 1000°C.
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