Annealing effect on microstructure, hardness and creep properties of the foils of alloy 617

다국어 초록 (Multilingual Abstract)

The rolling and annealing effect on the microstructure and high temperature creep properties of Ni-base alloy 617 foils were investigated. Two types of foil specimens with different thickness reduction were prepared by thermo-mechanical processing, which is a combination of cold rolling and static recrystallization. The thermo mechanical processing (TMP) is a way to considerably influence the grain size. The recrystallization and grain growth were observed readily at both lower and higher annealing temperatures. The grain sizes were strongly dependent on the thickness reduction and the annealing temperature. The grain sizes were observed bigger at higher annealing temperature than lower annealing temperature. Due to the microstructure analysis, the carburization was observed at lower annealing temperature and lower thickness reduction. The uniform coarse grain sizes increase the resistance for creep deformation and crack growth owing to the precipitation hardening. The lower thickness reduction foils were found better creep properties.

목차 (Table of Contents)

• Abstract
• 1. Introduction
• 2. Experimental
• 3. Results and discussions
• 4. Conclusions
• 5. Acknowledgements
• 6. References