| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Equipment, Instrumentation and In-Situ Process Monitoring
|
| Presentation Title |
A-19: In-process Microstructure Sensing of Gr91 Powder Bed Fusion Parts Using Ultrasonics |
| Author(s) |
Nathan Kizer, Christopher Kube, Edward Reutzel, Corey Dickman |
| On-Site Speaker (Planned) |
Nathan Kizer |
| Abstract Scope |
Gr91 stainless steel (9Cr-1Mo) is common in power plant components because of its high temperature creep strength. In traditional Gr91 components, the strength results from heat treatment steps toward forming a martensitic microstructure. Recently, efforts in the materials research community have attempted to recreate the desired microstructure using only additive manufacturing (AM) processes. Our work continues this thread. However, our focus is on developing an in-process powder bed fusion sensing modality capable of discerning variations in Gr91 microstructures across an array of coupons manufactured with different process parameters. The sensing modality is based on in situ ultrasonic sensors integrated into a build substrate with one sensor under each part coupon. This presentation will highlight multiple measured ultrasonic parameters and assess their sensitivity to the microstructures obtained. Enabling this capability is expected to bring rapid in-process characterization of microstructure relevant to efforts attempting to custom tailor microstructures during AM processes. |