Rejuvenation heat treatment’s influence on the microstructure and properties of superalloys

ABSTRACT

Rejuvenation heat treatment is an important technology to restore damaged microstructure and properties of superalloys. This investigation is conducted to figure out the effect of rejuvenation heat treatment on the superalloys. The microstructure and micro-hardness of K002 and DZ125 superalloys after different heat treatment procedures were evaluated. The results show that the heating temperature mainly affects the solubility of the carbides and γ′ phases, while the cooling rate has an effect on the morphology of secondary γ′ phase. Owing to the transition of carbides during the work process, rejuvenation heat treatment temperature has little effect on the amount of carbides in damaged alloys. Suggestions for rejuvenation heat treatment are proposed.

KEYWORDS:

• Superalloy
• rejuvenation heat treatment
• heating temperature
• cooling rate

Disclosure statement

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

Additional information

Funding

This work is supported by the funding: The National Key Research and Development Program of China (Grant No. 2016YFF0203300), managed by the Ministry of Science and Technology of the People's Republic of China.