|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Friction Stir Welding and Processing IX
||High Temperature Properties and Microstructures of ODS and RAFM Alloys FSW
||Wei Tang, Xinghua Yu, David Hoelzer, Zhili Feng
|On-Site Speaker (Planned)
Oxide dispersion strengthened (ODS) steels and reduced-activation ferritic/martensitic (RAFM) steels are two primary structural material candidates to safely sustain the extremely hostile environment inside the fusion reactor. Joining them without largely degrade their high temperature properties is a major challenge. Solid phase friction stir welding (FSW) was used to join ODS alloy 14YWT, RAFM alloys 9Cr and F82H. FSW parameters were compared, joint microstructures were characterized by optical and electronic microscopes, tensile creep-rupture tests were performed using a Gleeble system, and local deformations at different metallurgical zones were recorded by digital image correlation technology. Results showed unique material flow pattern in dissimilar FSW, stir zone (SZ) and heat affected zone (HAZ) grain sizes and hardness were affected by FSW heat input, nano-scaled strengthening particles aggregation was observed in ODS alloy SZ, and RAFM SZ high temperature creep resistance was better than that of the HAZ and base metal.
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