研究了GH909合金在650℃长期时效后的组织和性能的变化。结果表明,合金在650℃长期时效后,针状ε和ε″相大量析出并粗化,γ′相数量增加,尺寸基本不变;合金的拉伸强度下降,塑性提高,650℃×510MPa缺口持久寿命提高。合金在650℃长期时效2000h后组织和性能比较稳定,具有较好的综合性能。

The microstructure and mechanical properties of superalloy GH909 after long time exposure up to 2000h at 650℃ are studied. It is indicated that after long time exposure at 650℃ the quantity of ε/ε″acicular phase increases and their sizes coarsen, the quantity of γ′phase increases, the tensile strength of the alloy reduces and ductility increases, at 650℃/510MPa, notch rupture life increases. The microstructure and mechanical properties of the alloy after long time exposure up to 2000h at 650℃ are still basically stable, the alloy GH909 has good combination properties.