Influence of Particle Dispersions on the High-Temperature Strength of Ferritic Alloys

Conference · Mon Jan 01 04:00:00 EST 2007

OSTI ID:931625

Hoelzer, David T ^[1]; Bentley, James ^[1]; Sokolov, Mikhail A ^[1]; Miller, Michael K ^[1]; Odette, George R. ^[2]; Alinger, M. J. ^[3]

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1. ORNL
2. University of California, Santa Barbara
3. University of California, Berkeley

Four ferritic alloys based on the composition Fe-14Cr-3W-0.4Ti (nominal wt.%) were developed with a predominant dispersion of either oxide particles or nano-size Y-,Ti-,O-rich clusters, or nanoclusters (NC). Tensile specimens machined from the alloys were tested at room temperature and at temperatures ranging from ~360 C to 800 C in air using a strain rate of 10 3s 1. The results showed that the high-temperature strength of the NC strengthened alloys was significantly better than that of the oxide strengthened alloys. The room temperature yield strengths of the two alloys containing the NC were 1469MPa and 1261MPa while the yield strengths of the two oxide dispersion alloys were 819MPa (Y-Ti-oxides) and 583MPa (Ti-oxides). However, the ductility of the oxide strengthened alloys was better than that of the NC strengthened alloys.

• Research Organization: Oak Ridge National Laboratory (ORNL); Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: ORNL LDRD Director's R&D; ORNL work for others
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 931625
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AIR
ALLOYS
DUCTILITY
OXIDES
STRAIN RATE
YIELD STRENGTH