Study on the Dislocation Density and Deformation Mechanism of Superalloy IC10 at 700°C

摘要

Superalloy IC10 is one of the materials used for hot section components of new generation aero engine. High temperature tensile tests are carried out for IC10 under different strains at 700 degrees C. The dislocation density increases with the increase of the strain. At early stage of deformation (strain 3%), the motion of dislocation is mainly described as climbing and shearing. When the deformation further increases (strain 6%), cross slip of the screw dislocation is found and various microstructures, such as stacking faults, K- W locks and dislocation dipoles are observed in IC10 superalloy. At last stage of deformation (fracture), many dislocations pile up at phase boundary, leading to the reorganization and redistribution of dislocations. The mechanical properties of IC10 alloy at 700 degrees C are mainly featured by strain hardening, which is concerned to the increase of dislocation density, and to the microstructure of dislocation cell, stacking fault and K-W lock. Finally, the dislocation density is used in the constitutive model to describe the flow behavior of IC10 alloy at 700 degrees C.