|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing for Energy Applications III
||Microstructural, Mechanical, and Corrosion Behavior of a High Entropy Alloy (HEA) designed for Harsh Aqueous Environments
||Nikole J. Kucza, Martin Morra, Kosuke Kuwabara
|On-Site Speaker (Planned)
||Nikole J. Kucza
A CoCrFeNiTiMo-based high entropy alloy (HEA) was designed for corrosion resistance and successfully printed, using selective laser melting (SLM), into near-net-shape hardware and test-blocks. Materials properties were benchmarked (microstructure, mechanical, and corrosion) against conventional cast and wrought alloys used in subsea O&G applications.
All specimens received a post-processing heat treatment to relieve stress and precipitate the strengthening phases. Mechanical properties at room temperature yield the following: impact energy of 39.7-40.9 J, yield strength of 890-892 MPa, and the UTS of 1420 – 1459 MPa. Fracture toughness was good with very slow fatigue crack growth rates. Aqueous corrosion resistance is excellent (< 1 mpy) in a near neutral pH (3.5 wt.% NaCl) and acidic oxidizing (10 wt.% HNO3) environments and comparable to conventional superalloys in acidic reducing (10 wt.% HCl) environments. Results so far suggest the build orientation and location on the build plate have little effect on properties and microstructure.