About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Advanced Materials for Harsh Environments
|
| Presentation Title |
Hydrogen Environment Assisted Cracking Behavior of Binder Jet Printed 17-4PH Stainless Steel |
| Author(s) |
Borna Rafiei, Adam Thompson, Pierangeli Rodriguez De Vecchis, Zachary Harris |
| On-Site Speaker (Planned) |
Borna Rafiei |
| Abstract Scope |
This research aims to clarify the contribution of alloy microstructure to hydrogen environment-assisted cracking (HEAC) susceptibility of additively manufactured 17-4PH stainless steel fabricated via binder jet printing (BJP) when exposed to representative marine environments. Microstructural analyses show that, while conventionally manufactured (CM) and laser powder bed fusion (LPBF) 17-4PH have broadly similar martensitic microstructures, BJP 17-4PH exhibits a complex combination of retained ferrite, austenite, and martensite. Therefore, advanced fracture mechanics testing using stress corrosion cracking (SCC) coupled with multiscale characterization of the near-crack region will be used to identify how such differences in bulk microstructure impact the local interaction between microstructure and hydrogen-induced damage responsible for HEAC. Results reveal a strong influence of post-processing heat treatments on HEAC as well as the fracture morphology. The causal factors potentially responsible for this variation are then discussed in the context of existing models for HEAC. |