Results of the second phase of an investigation on several high-purity, low-carbon irons in the alpha region of the Fe-C diagram which was made in an attempt to correlate brittle behavior, as defined by the Charpy V-notch transition temperature, with yield-point and fracture data from uniaxial tension tests are summarized in this report. All of the alloys tested showed a sharp rise in impact transition temperature corresponding to the precipitation of Fe Sub 3 C. The data also indicate that ferrites with veining have higher transition temperatures than those without veining as quenched from the alpha or unsaturated region. Two of the alloys show a decrease in the transition temperature of the ferritic structures as saturation is approached. Two hypotheses are advanced to explain this: 1) as the temperature is lowered in the alpha region, the concentration of carbon atoms at grain boundaries increases, and 2) carbon segregates at sub-grain as well as at primary boundaries and in some way "strengthens" the sub-grain boundaries so that they assume more of the properties of high-angle grain boundaries.

  • Corporate Authors:

    University of Pennsylvania Law School

    3400 Chestnut Street
    Philadelphia, PA  United States  19104

    Ship Structure Committee

    National Academy of Science, 2101 Constitution Avenue, NW
    Washington, DC  United States  20418
  • Authors:
    • London, G J
    • Spangler, G
    • Brick, R M
  • Publication Date: 1959-3-31

Media Info

  • Features: References;
  • Pagination: 25 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00331295
  • Record Type: Publication
  • Source Agency: Ship Structure Committee
  • Report/Paper Numbers: SSC- 93 Prog Rpt.
  • Contract Numbers: NObs-50062, NObs-72046
  • Files: TRIS
  • Created Date: May 21 1981 12:00AM