Microstructural evolution for a single-crystal superalloy after high-temperature treatments with different holding times

In the present work, the thermal heating and cooling behaviour of a single-crystal superalloy containing 2wt-% Re was tested to investigate the gamma ' dissolution process, and the surface recrystallisation behaviour of the grit-blasted superalloy was investigated near its ultimate service temperature of 1100 degrees C by EBSD and TEM. Particularly, the aged samples were vertically polished to reveal the progress of the discontinuous precipitation reaction front. The microstructure characteristics, including grain orientation, grain size, texture and TCP phase precipitation, were revealed for a detailed understanding of the surface crystallisation behaviour of the material.

Automated summary

The thermal heating and cooling behavior of a single-crystal superalloy containing 2wt-% Re was investigated in this study to understand the dissolution process of gamma ' and the surface recrystallization behavior of grit-blasted superalloy near its ultimate service temperature of 1100 degrees C. Aged samples were vertically polished to observe the progress of the discontinuous precipitation reaction front. Microstructure characteristics, including grain orientation, grain size, texture, and TCP phase precipitation, were studied to gain a detailed understanding of the surface crystallization behavior of the material.