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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 6    December 2003

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Dissolution kinetics and behavior of δ phase in Inconel 718
CAI Da-yong(蔡大勇), ZHANG Wei-hong(张伟红), NIE Pu-lin(聂璞林), 
LIU Wen-chang(刘文昌), YAO Mei(姚 枚)

Key Laboratory of Metastable Materials Science and Technology,
 Yanshan University, Qinhuangdao 066004, China

Abstract:Dissolution kinetics of δ phase in Inconel 718 at 980, 1000 and 1020℃ respectively was established using the quantitative X-ray diffraction(XRD) method. Microstructure evolution during dissolution process was analyzed with scanning electron microscopy(SEM). Dissolution rate of δ phase during high temperature heating keeps at a high level at the beginning stage, and then decreases gradually with the increase of heating time. A dynamic equilibrium state approaches after being heated at 980℃ for more than 30min and at 1000℃ for more than 2h, and the equilibrium mass fraction are 3% and 0.6% respectively. δ phase fully dissolves into the austenitic matrix after being heated at 1020℃ for more than 2h. The dissolution and fracture effects cause the morphology evolution of δ phase from long needle shape to short bars or particles at high temperature.

 

Key words: Inconel 718; δ phase; dissolution kinetics; diffusion 

ISSN 1672-7029
CN 43-1423/U

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