An In Situ Resistance-Based Method for Tracking the Temporal Evolution of Recovery and Recrystallization in Ni-Base Single-Crystal Superalloy at Super-Solvus Temperatures

Abstract This study explores the influence of thermo-mechanical behavior and microstructure on recovery recrystallization in single-crystal superalloys during casting subsequent solution heat treatment, using miniature testing. Here, temporal evolution resistance was measured situ electrothermal mechanical testing (ETMT) to track process (RX). It found that is dominant only when incomplete dependent both history dependence strain path as well magnitude accumulated plastic strain. A precursor occurrence subgrains deformation twins sample surface, where a characteristic butterfly-type morphology γ′ precipitates always observed highly strained regions. The migration RX grain boundaries accompanied by elimination lattice curvature associated with density geometrically necessary dislocations. Homogenized samples provide most reliable results, while interpreting resistivity changes more challenging inhomogeneity (microsegregation, local variation properties) as-cast material prevails.