| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
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| Symposium
|
Resisting Degradation from the Environment: A Symposium Honoring Carolyn M. Hansson’s Research and Pioneering Experiences as a Woman in STEM
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| Presentation Title |
Corrosion and Environmentally Assisted Cracking (EAC) Evaluation of Additively Manufactured (AM) High Strength Precipitation Hardened Steel (UNS S17400) |
| Author(s) |
Michelle Gaudett Koul, Conner Panick |
| On-Site Speaker (Planned) |
Michelle Gaudett Koul |
| Abstract Scope |
AM 17-4PH steel heat treated to the H1100 condition was characterized using the constant extension rate testing method in 3.5 wt.% NaCl solution. Results were examined as a function of specimen orientation with respect to the build direction and compared to the H1100 wrought condition. Select AM specimens showed susceptibility to corrosion which correlated with a significantly decreased ductility and strength. Scanning electron microscopy of these specimens indicated the presence of unfused powder particles and voids in the bulk AM material that appear to be susceptible to corrosion. As-melted surfaces within these voids contained Si oxides, large Nb particles, Cu precipitates and Cr depletion from the subsurface. AM materials contained a grain boundary phase that correlated with microscopically ductile intergranular fracture. Elemental grain boundary segregation/depletion was not observed but (reverted) austenite was identified in electron backscatter diffraction images. |