摘要
Dissolution kinetics of δ phase in Inconel 718 at 980, 1 000 and 1 020 ℃ 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 30 min and at 1 000 ℃ for more than 2 h, and the equilibrium mass fraction are 3% and 0.6% respectively. δ phase fully dissolves into the austenitic matrix after being heated at 1 020 ℃ for more than 2 h. The dissolution and fracture effects cause the morphology evolution of δ phase from long needle shape to short bars or particles at high temperature.
Dissolution kinetics of δ phase in Inconel 718 at 980, 1 000 and 1 020 ℃ 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 30 min and at 1 000 ℃ for more than 2 h, and the equilibrium mass fraction are 3% and 0.6% respectively. δ phase fully dissolves into the austenitic matrix after being heated at 1 020 ℃ for more than 2 h. The dissolution and fracture effects cause the morphology evolution of δ phase from long needle shape to short bars or particles at high temperature.
出处
《中国有色金属学会会刊：英文版》
CSCD
2003年第6期1338-1341,共4页
Transactions of Nonferrous Metals Society of China
基金
Project(5 99710 3 9)supportedbytheNationalNaturalScienceFoundationofChina
