EXTENSION OF AN ANISOTROPIC CREEP MODEL TO GENERAL HIGH-TEMPERATURE DEFORMATION OF A SINGLE-CRYSTAL SUPERALLOY

A physics based model has been developed that accounts for the princip al features of anisotropic creep deformation of single crystal superal loys. The present paper extends this model to simulate other types of high temperature deformation under strain controlled test conditions, such as stress relaxation and tension tests at constant strain rate in single crystals subject to axial loading along an arbitrary crystal d irection. The approach is applied to the SRR99 single crystal superall oy where a model parameter database is available, determined via analy sis of a database of constant stress creep curves. A software package has been generated to simulate the deformation behaviour under complex stress-strain conditions taking into account anisotropic elasticity.