Accession Number:

AD0627382

Title:

INFLUENCE OF TEST TEMPERATURE AND SOLUTE ADDITIONS ON THE PLASTIC FLOW AND STRAIN HARDENING OF ALPHA IRON,

Descriptive Note:

Corporate Author:

ARMY MATERIALS RESEARCH AGENCY WATERTOWN MASS

Personal Author(s):

Report Date:

1965-09-01

Pagination or Media Count:

69.0

Abstract:

The effects of such solute alloy additions as A1, Co, Cr, Mn, Mo, Ni, Si, and V on the plastic flow and strain-hardening properties of quasi-iron binary alloys were studied over a range of testing temperatures from 200 to -196 C. A pronounced inversion of the strength of alpha iron was noted for most of the alloys studied at the lower test temperatures and higher compositions. The principal exception to this behavior is noted for the Fe-Co and Fe-Cr alloys. Strength increases as a function of composition as seen at room temperature could be reasonably approximated by a straight line relationship. However, at the lower test temperatures this linear behavior was not observed. Except for Co, Cr, and V, which show no effect, the flow stress-temperature dependence of alpha iron alloys is shown to be strongly influenced by the amount and type of solute present. Finally, the strain-hardening behavior of iron, which is characterized by a marked transition of the strain-hardening exponent n between-40 and -80 C, is shown to be strongly influenced by the added solute, with Ni giving the greatest and Co, Cr, and V giving the least effect in this transition region. A possible hypothesis is offered to explain this behavior in terms of a basic change in the deformation behavior of iron, which is characterized by a decreased tendency for cell formation. Author

Subject Categories:

  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE