Influence of stress and secondary orientation on the oxidation-induced dynamic recrystallization behavior of a Ni-based single crystal superalloy

The stress and orientational dependence of the oxidation-induced dynamic recrystallization of a Nibased single crystal superalloy during high temperature creep were investigated. Cellular recrystallization appeared on the surface of the sample because of the oxidation-induced gamma'-free layer. With the increase of the stresses, the depths of the recrystallized layers increased at first and then decreased. Besides, the tendency of recrystallization in < 011 > orientation was stronger than that in < 010 > orientation under the same load. The underlying mechanisms are discussed in this study. (C) 2017 Elsevier B.V. All rights reserved.