Accession Number:

AD0607236

Title:

THE RECRYSTALLIZATION KINETICS OF HIGH PURITY IRON.

Descriptive Note:

Final technical rept. for 1 Oct 62-1 Oct 63,

Corporate Author:

MATERIALS RESEARCH CORP ORANGEBURG N Y

Personal Author(s):

• Hughes,E. J.
• Barton,P. W.
• Johnson,A. A.
• Abowitz,G.

Report Date:

1964-08-01

Pagination or Media Count:

1.0

Abstract:

Measurements have been made of the isothermal recrystallization kinetics of electron beam zone refined iron. The principal impurities in this material were tungsten, carbon, nitrogen, oxygen and hydrogen which together totalled approximately 50 ppm. The results are interpreted in terms of a theory of solute limited grain boundary migration re cently proposed by Cahn 1962. According to this interpretation the boundary velocity at low velocities is determined principally by drag due to the tungsten impurity atoms, while at high velocities it is determined principally by the other four species of impurities. Some evidence tending to support these conclusions was obtained by repeating the measurements on similar material to which extra carbon had been added. This had the effect, as expected, of slowing down the grain boundary migration more in the high velocity region than in the low. Author

Descriptors:

• IRON
• ZONE MELTING
• ELECTRON BEAMS
• REFINING
• TUNGSTEN
• CARBON
• NITROGEN
• OXYGEN
• HYDROGEN

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE