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研究了长期时效对一种镍基单晶高温合金显微组织及持久性能的影响。结果表明:800℃时效1000h后,γ′相仍保持立方体形态;980℃时效1000h、1010℃时效500h后,γ′相逐渐连接形筏。980℃时效500h、1010℃时效100h后,μ相以针状和颗粒状形态逐渐析出,980℃时随时效时间延长,μ相逐渐增加,1010℃时随时效时间延长,μ相先增加后减少。800℃长期时效后合金的持久寿命变化不大,980,1010℃时随时效温度升高和时效时间延长,合金的持久寿命递减。
The effect of long-term aging on the microstructure and ductility of a nickel-based single crystal superalloy was investigated. The results show that the γ ’phase still retains the cubic morphology after aging at 800 ℃ for 1000h, and the γ’ phase is gradually connected to the formation rafts after aging at 980 ℃ for 1000h and aging at 1010 ℃ for 500h. After aging at 980 ℃ for 500h and aging at 1010 ℃ for 100h, the phase of μ gradually precipitated in acicular and granular form. With the aging time at 980 ℃, the μ phase increased gradually. With the aging time increasing at 1010 ℃, μ phase first increased and then decreased . Long-term aging at 800 ℃ for a long time does not change the durability of the alloy, 980,1010 ℃ with the aging temperature and aging time, the alloy’s long-lasting life decreases.