The evolution law of δ phase of IN718 superalloy in temperature/stress coupled field

An evolution law of δ phase of IN718 superalloy in temperature/stress coupled field is studied in the present research. The results show that the δ phases accelerate precipitates on the grain boundaries with applied stress. In the temperature/stress coupled field, both the nucleation and growth rate...

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Bibliographic Details
Published in:Materials characterization 2022-02, Vol.184, p.111684, Article 111684
Main Authors: Deng, Hanzhong, Wang, Lei, Liu, Yang, Song, Xiu, Meng, Fanqiang, Huang, Shuo
Format: Article
Language:English
Subjects:
evolution law
IN718 superalloy
temperature/stress coupled field
δ phase
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Summary:An evolution law of δ phase of IN718 superalloy in temperature/stress coupled field is studied in the present research. The results show that the δ phases accelerate precipitates on the grain boundaries with applied stress. In the temperature/stress coupled field, both the nucleation and growth rate of a δ phase will be significantly accelerated with stress. The increasing driving force of nucleation depends on the increase of the strain energy and reduction of the system free energy, promoting nucleation of the δ phase. The high growth rate is caused by increasing the joint phenomenon of the adjacent same-oriented δ rods with the coupled action of the temperature and stress. •The δ phase evolution is accelerated in the temperature/stress coupled field.•The nucleation rate of the δ phase of IN718 alloy aged with stress is increased.•The joint of the adjacent same-oriented δ is increased by stress.
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2021.111684