Transmission electron microscope characterization of deformation and recovery in 304L stainless steel part
- Oak Ridge Y-12 Plant, TN (United States)
- Allied-Signal Aerospace Co., Kansas City, MO (United States). Kansas City Div.
Type 304L stainless steel sheet formed by a semi-piercing process has regions of localized plastic deformation and material flow estimated to correspond to approximately 40% cold work at maximum. The resulting microstructures in the bulk (undeformed) and deformed regions were characterized by transmission electron microscopy prior to and following annealing treatments. The deformed region prior to annealing was observed to have complex microstructure consisting of {gamma} phase and the strain induced martensitic phases, {alpha}{prime} (bcc) and {epsilon} (hcp). Additionally, high densities of dislocations, stacking faults, and deformation twins were observed. Annealing at 450{degrees}C for 15 minutes resulted in little observed microstructural change. After 30 minutes at 750{degrees}C, considerable recrystallization and recovery was evident with substantial reversion of the martensitic phases. The residual banded microstructural features associated with the deformed structure were identified as twin related {gamma} (fcc). Finally, annealing at 1050{degrees}C showed a completely recrystallized microstructure having large equiaxed grains, annealing twins, and a with very low dislocation density.
- Research Organization:
- Oak Ridge Y-12 Plant, TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OS21400
- OSTI ID:
- 10141196
- Report Number(s):
- Y/DW-1125; ON: DE92013237
- Resource Relation:
- Other Information: PBD: Dec 1991
- Country of Publication:
- United States
- Language:
- English
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