Trapping of Sb by TiC precipitates in Fe

Journal Article · Fri Aug 01 04:00:00 EDT 1980 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02653504· OSTI ID:5032029

Myers, S M; Follstaedt, D M; Rack, H J

Ion-beam experiments have yielded strong evidence for trapping of Sb by TiC precipitates in Fe. Alloyed layers exhibiting this effect were produced by ion implanting Ti, C, and Sb into Fe at room temperature and then aging at 873 or 973 K. The depth distribution of the constituents and the microstructure were monitored by ion backscattering analysis and transmission electron microscopy. Heating initially caused a dense dispersion of TiC precipitates to form, and Sb was bound within the region of the Fe containing these precipitates. No evidence of Sb intermetallic compounds was found. Continued annealing resulted in Sb diffusion from the precipitated layer into the underlying bulk of the Fe, and the kinetics of this release were shown to be consistent with a trapping process. These observations and additional evidence prompt the inference that Sb is bound to the TiC precipitates, presumably occupying the TiC-Fe interface. The binding enthalpy is estimated to be approx. 0.4 eV when referenced to an untrapped Sb site in the ..cap alpha..-Fe phase. This trapping effect may provide a means for immobilizing Sb and other metalloid impurities in ferritic steels to inhibit temper embrittlement.

• Research Organization: Sandia National Labs., Albuquerque, NM
• OSTI ID: 5032029
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 11:8; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ANTIMONY
CARBIDES
CARBON COMPOUNDS
CRYSTAL STRUCTURE
ELEMENTS
EMBRITTLEMENT
HEAT TREATMENTS
IRON ALLOYS
IRON BASE ALLOYS
METALS
MICROSTRUCTURE
SURFACE PROPERTIES
TEMPERING
TITANIUM CARBIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRAPPING