选用980 ℃时效温度、分别对[001]取向标准热处理后的第2代单晶高温合金DD6进行100,200,300,400,600,800及1000 h的长期时效,研究了合金的显微组织与持久性能.结果表明:DD6合金980℃/1000 h长期时效后,无TCP相析出,组织稳定性优良;DD6合金980℃/1000 h长期时效后980℃/248.2 MPa的持久寿命高于180 h,合金具有优异、稳定的持久性能.
The microstructures and stress rupture properties of the second generation single crystal superalloy DD6 with [001]orientation were investigated after the full heat treatments were performed and aged at 980 ℃ for 100, 200, 300, 400, 600, 800and 1000 h, respectively. The results show that topologically close packed (TCP) phase is not found in DD6 alloy aged at 980℃ for 1000 h. It indicates that DD6 has good microstructure stability after long-term aging at 980 ℃. The stress rupture livesof DD6 alloy aged for 1000 h are more than 180 h at 980 ℃/248.2 MPa and DD6 alloy exhibits excellent stability of the stressrupture properties after long-term aging at 980 ℃.
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