Microstructure Optimization of Austenitic Alloy 800H (Fe-21Cr-32Ni)

Journal Article · Fri Dec 31 23:00:00 EST 2010 · Materials Science and Engineering A

DOI:https://doi.org/10.1016/j.msea.2010.12.052· OSTI ID:1004434

Tan, Lizhen ^[1]; Rakotojaona, L ^[2]; Allen, Todd R. ^[3]; Nanstad, Randy K ^[1]; Busby, Jeremy T ^[1]

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1. ORNL
2. Ecole des Mines de Paris
3. University of Wisconsin, Madison

The microstructural evolution, specifically of grain boundaries, precipitates, and dislocations in thermomechanically processed (TMP) Alloy 800H samples was characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), electron backscattered diffraction (EBSD), transmission electron microscopy (TEM), and atomic force microscopy (AFM). The TMP not only significantly increased the fraction of low-{Sigma} coincidence site lattice boundaries, but also introduced nanoscale precipitates in the matrix and altered the distribution of dislocations. Statistical analysis indicates that the morphology and distribution of grain boundary precipitates were dependent on grain boundary types. The microstructure optimization played a synergistic effect on the significantly increased strength with comparable ductility and enhanced intergranular corrosion resistance and creep-fatigue life compared to the as-received samples.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: NE USDOE - Office of Nuclear Energy
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1004434
• Journal Information: Materials Science and Engineering A, Journal Name: Materials Science and Engineering A Journal Issue: 6 Vol. 528; ISSN 0921-5093
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ATOMIC FORCE MICROSCOPY
DIFFRACTION
DISLOCATIONS
DISTRIBUTION
DUCTILITY
ELECTRONS
GRAIN BOUNDARIES
INCOLOY 800H
INTERGRANULAR CORROSION
MICROSTRUCTURE
MORPHOLOGY
OPTIMIZATION
SCANNING ELECTRON MICROSCOPY
TRANSMISSION ELECTRON MICROSCOPY
X-RAY SPECTROSCOPY