|About this Abstract
||MS&T23: Materials Science & Technology
||Late News Poster Session
||A-17: In Situ Residual Stress Measurements for 9Cr1Mo (Gr 91) Stainless Steel Using Ultrasound
||Nathan J. Kizer, Corey J Dickman, Edward W Reutzel, Christopher M Kube
|On-Site Speaker (Planned)
||Nathan J. Kizer
Residual stress build up is a primary cause of build failure in metal AM processes. It results from strong thermal gradients inherent to the melt process. Thus, monitoring residual stress during the process can provide valuable insight prior to failure with potential to allow for remediate process steps. This presentation describes the use of ultrasound for online residual stress sensing, which is possible through stress-dependent elastic properties. Results from a 9Cr1Mo stainless steel build with build plate integrated ultrasound sensors will be highlighted. In addition to potentially circumventing build failures, controlling for residual stress will reduce distortion and improve the ability to remain within geometrical design specifications.