| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Mechanisms and Mitigation of Aqueous Corrosion and High-temperature Oxidation
|
| Presentation Title |
Environmentally Assisted Cracking of AM718 Wire Arc Additively Deposited AM 718 – Role of Processing and Microstructure |
| Author(s) |
Ramgopal Thodla, Badri Naraynan, Hannah Sims, Ben Schaeffer |
| On-Site Speaker (Planned) |
Ramgopal Thodla |
| Abstract Scope |
Environmentally assisted cracking (EAC) of AM 718 fabricated using wire arc additive manufacturing processes was studied under cathodic polarization. The effect of deposition path parameters for the arc deposition on starting microstructure and defect generation was assessed using systematic exploration of the operating space. The additive deposits were subjected to different heat treatments to optimize the microstructure for corrosion performance. The Kth values measured using rising displacement test methods were compared with those of wrought material tested under similar conditions. Crack growth rate measurements under constant K conditions over a range of potentials was also compared with the crack growth rate measured on wrought 718 under similar conditions. The EAC results were co-related with key elements of the microstructure of AM 718 i.e. ’/” strengthening precipitates, grain boundary phase as well as other Laves phases present in the microstructure. |