|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||Creep Behavior and Microstructural Characterization of Weld Transition Joints between P91 and AISI 304
||Javed Akram, Prasad Rao Kalvala, Mano Misra
|On-Site Speaker (Planned)
A weld transition weld joint was developed between modified 9Cr-1Mo steel (P91) and austenitic stainless steel (AISI 304) using friction welding to address the issue of premature failures of welds between ferritic creep resistant steels and austenitic stainless steels in power plant. Three Inconel alloys (625, 600, and 800H) were used as interlayers between P91 and AISI 304. Creep rupture tests showed that three layers welds performed better compared with single and direct welds. Using concept of threshold stress, the creep deformation mechanism was found to be viscous glide due to solute drag. The microstructural analysis at the weld interface of the welds showed the formation of large sub-grains due to carbon diffusion and is found to be main reason for the premature failure of these dissimilar weld joints.
||Planned: Supplemental Proceedings volume