【摘要】 GH99合金在800～950 ℃温度范围内时效100～1000h后,其析出相的种类与8h时效热处理的相同,为γ＇、M₂₃C₆、M₆C和TiC（含TiN）。γ’按照时间的立方根规律而长大,其长大激活能为243 kJ/mol.但800℃时效时间超过500h后,γ’尺寸却保持不变。GH99合金经上述温度长期时效后,室温塑性和持久寿命都有衰减现象,但800 ℃时效的衰减得较为轻微。更多还原

【Abstract】 The precipitates in GH99 alloy during exposure in the temperature range of 800-950℃ for 100-1000h are similar to those precipitated after 8h aging treatment, namely γ, M23C6, M6C and TiC(TiN included). The γ’ particle size increases linearly with the cube root of time. The activation energy for γ’ growth is 234 kJ/mol. However, after exposure over 500h at 800℃, the γ’ particle size kept constant and both room-temperature ductility and stress-rupture life were reduced slightly.更多还原