Stainless Steel Microstructure and Mechanical Properties Evaluation
A nitrogen strengthened 21-6-9 stainless steel plate was spinformed into hemispherical test shapes. A battery of laboratory tests was used to characterize the hemispheres. The laboratory tests show that near the pole (axis) of a spinformed hemisphere the yield strength is the lowest because this area endures the least “cold-work” strengthening, i.e., the least deformation. The characterization indicated that stress-relief annealing spinformed stainless steel hemispheres does not degrade mechanical properties. Stress-relief annealing reduces residual stresses while maintaining relatively high mechanical properties. Full annealing completely eliminates residual stresses, but reduces yield strength by about 30%.
- Research Organization:
- Kansas City Plant (KCP), Kansas City, MO (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI ID:
- 1129927
- Report Number(s):
- KCP-613-8779
- Country of Publication:
- United States
- Language:
- English
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