EFFECT OF COLD FORMING ON THE STRESS-STRAIN CHARACTERISTICS OF HY-80 STEEL PLATES.
UNITED STATES STEEL CORP MONROEVILLE PA
Pagination or Media Count:
This report describes the effects of cold deformation and subsequent stress relieving or aging on the stress-strain characteristics of the HY-80 steel plates. True-stress-true-strain curves were evaluated, and the results indicated that changes in the behavior of cold-formed HY-80 plates occurred primarily in the initial portion of the stress-strain curves. Analysis of the initial portions of stress-strain curves of colddeformed material showed that material tested in the same direction as the cold deformation had a slightly lower secant modulus during loading, and a higher flow-stress curve than undeformed material because of strain hardening. Material tested in a direction opposite to the cold deformation had a lower secant modulus during loading and a lower flow-stress curve than undeformed material--a manifestation of the Bauschinger effect. Author