RAMBERG-OSGOOD STRAIN-HARDENING CHARACTERIZATION OF AN ASTM A302-B STEEL

The Ramberg-Osgood strain-hardening exponents and coefficients are cha racterized for an unirradiated ASTM A302-B steel over a wide range of temperatures from -129 to 260 degrees C. The strain-hardening exponent increases only slightly with temperature over this range, while the c oefficient decreases with increasing temperature. Tensile specimens ir radiated to 0.002, 0.029, and 0.046 dpa exhibited significant increase s in the strain-hardening exponent with increasing neutron in irradiat ion level.