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

Abstract

In the present work, the thermal heating and cooling behaviour of a single-crystal superalloy containing 2wt-% Re was tested to investigate the γ′ dissolution process, and the surface recrystallisation behaviour of the grit-blasted superalloy was investigated near its ultimate service temperature of 1100°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.

KEYWORDS:

• Single-crystal superalloys
• surface recrystallisation
• discontinuous precipitation
• EBSD

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (52071012), the Academic and Technical Leaders of Major Disciplines in Jiangxi Province (20182BCB22020) and Xi’an Advanced Manufacturing Technology Project (21XJZZ0048).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [grant number 52071012]; Xi’an Advanced Manufacturing Technology Project [grant number 21XJZZ0048]; the Academic and Technical Leaders of Major Disciplines in Jiangxi Province [grant number 20182BCB22020].