The Role of Alloying Elements in Nanostructured Ferritic Steels

Journal Article · Fri Jan 01 04:00:00 EST 2010 · Materials Science and Technology

OSTI ID:1011006

Miller, Michael K ^[1]; Parish, Chad M ^[1]

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1. ORNL

The roles of the alloying elements in three nanostructured ferritic alloys (14YWT, MA957 and Eurofer 97) have been established through the characterisation of the microstructure by atom probe tomography and spectrum imaging in a transmission electron microscope. Cr, W, Mo, Ti and Y were found in the ferrite matrix and contributed to solid solution hardening. Ti, Y, C, O and N were found in high number densities of precipitates and nanoclusters both in the grain interior and on grain boundaries and thereby contributed to precipitation hardening. Cr, W and Mo were enriched at the intraparticle regions of the grain boundaries. The solute segregation and precipitation pinned the grain boundaries and contributed to the excellent creep properties of the alloys.

• Research Organization: Oak Ridge National Laboratory (ORNL); Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1011006
• Journal Information: Materials Science and Technology, Journal Name: Materials Science and Technology Journal Issue: 4 Vol. 27; ISSN 0267-0836; ISSN MSCTEP
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ATOMS
CREEP
ELECTRON MICROSCOPES
FERRITE
FERRITIC STEELS
GRAIN BOUNDARIES
HARDENING
MICROSTRUCTURE
PRECIPITATION
PRECIPITATION HARDENING
PROBES
SEGREGATION
SOLID SOLUTIONS
SOLUTES
TOMOGRAPHY