To increase the reliability of single-crystal blade durability estimations a phenomenological model of single crystal superalloy plasticity based on the use of an “equivalent” direction and its software implementation has been developed. The relative orientation between principal stresses and single-crystal (SX) axes is considered by this direction. In order to study the effect of crystallographic orientation (CO) on the characteristics of a single-crystal material, a series of tests was carried out at various temperatures under...