BS in Materials Engineering
Materials Engineering Department
Seamless rolled rings of C263 superalloy were forged by Carlton Forge Works in Paramount, CA and sectioned for mechanical testing. The as-forged ring sections were then machined into tensile samples. To simulate cold working done after Carlton’s forging process, the C263 tensile samples were strained using an Instron tensile tester to 1, 3, 5, 7, and 9% plastic strain. These tensile samples were then solution treated at 2100°F for 30 minutes and water quenched before being aged at 1470°F for 8 hours and air cooled, following Carlton Forge Works’ heat treatment process. The gauge length sections were metallographically prepared and etched using a mixture of 50% H2O, 40% HCL, and 10% H2O2. Using an optical microscope and imaging software, images were taken and average grain size of each sample was measured using a mean lineal intercept method as per ASTM E112. 1% strain was found to have the largest average grain size of 0.113 mm/grain. The average grain size decreased with an increase in strain value, with the smallest grain size being 0.057 mm/grain at 9% strain. This information will be used to construct a grain growth map for Carlton Forge Works to use while producing future forgings.