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- Title
Precipitation and dissolution behaviors of δ phase inside a deformed nickel-based superalloy during annealing treatment.
- Authors
Chen, Ming-Song; Wang, Guan-Qiang; Li, Hong-Bin; Lin, Y. C.; Zou, Zong-Huai; Ma, Yan-Yong; He, Dao-Guang; Zeng, Wei-Dong
- Abstract
The precipitation and dissolution behaviors of δ phase inside a deformed nickel-based superalloy during annealing treatment are investigated. A new method for quantitatively evaluating the content of δ phase was proposed based on SEM micrograph, which was verified by X-ray diffraction (XRD) analysis. The effects of recrystallization during pre-annealing at 980 °C on the precipitation and dissolution behaviors of δ phase in the subsequent annealing treatment at 900 °C and 980 °C are discussed. Moreover, the improved precipitation and dissolution kinetics models are proposed to consider the effects of recrystallization fraction. The results show that: (1) for the precipitation of δ phase at 900 °C, δ phases precipitate first in grain boundaries and then within grains after a long incubation period. Moreover, the interval between adjacent δ phases increases first and then drops with the increasing recrystallization fraction during pre-annealing treatment. A balance between the precipitation and solution of δ phase at the aging temperature of 900 °C can be reached when the holding time is about 12 h; (2) for the dissolution of δ phase at 980 °C, the dissolution equilibrium can be obtained at approximate 200 min. Moreover, more rod-like δ phases can be remained with the increasing recrystallization fraction in pre-annealing treatment.
- Subjects
NICKEL alloys; THERAPEUTICS; METEOROLOGICAL precipitation; CRYSTAL grain boundaries; HEAT resistant alloys; X-ray diffraction
- Publication
Applied Physics A: Materials Science & Processing, 2019, Vol 125, Issue 6, pN.PAG
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-019-2741-3