Journal
MATERIALS CHARACTERIZATION
Volume 140, Issue -, Pages 39-44Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2018.03.035
Keywords
Superalloy; Recrystallization; Annealing twins; EBSD; Friction welding
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Funding
- General Electric Global Research, Niskayuna, NY [401040918]
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Quantitative boundary misorientation analysis verified that discontinuous dynamic recrystallization (DDRX) was the primary grain refinement mechanism in friction welding of Alloy 718. Two models were developed to explain the formation mechanism of intragranular twins and intergranular twins, respectively. Intragranular twins were caused by grain boundary growth incidents. After twin initiation, the twin boundary migrated toward the plastic-deformed grain interior to reduce the stored energy. Additionally, intergranular twin boundaries were ascribed to boundary growth stagnation. When boundary growth stagnation occurred, twin boundaries could form and altered the orientation of the boundary migration front, so that boundary migration could progress, leaving a single twin boundary behind.
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