Effect of Solution Cooling Rate on Microstructure and Creep Properties of FGH97 Nickel-base Superalloy of Large Turbine Disk

被引：0
|
作者：
Zhang Hai [1 ]
Zou Zhihuan [1 ]
Long Anping [1 ]
Wang Chong [1 ]
Ou Yetao [1 ]
机构：
[1] Shenzhen Wedge Cent South Res Inst Co Ltd, Shenzhen 518045, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2020年 / 49卷 / 07期
关键词：
powder metallurgy superalloys; microstructure; creep; fracture; GB carbides; PERFORMANCE;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
FGH97 nickel-base superalloy was processed at different solution cooling rates. Then the microstructure and creep behavior of the superalloy were studied by optical microscope, scanning electron microscope, energy disperse spectroscopy and creep testing machine. The results show that the size of gamma' precipitates decreases and the carbide precipitation changes from continuous to discrete with the increase of the solution cooling rate, and GB carbides are rich in Ti, Nb, and Hf. The creep performance of the alloy with a solution cooling rate of 94 degrees C/min is significantly better than that with a cooling rate of 43 degrees C/min under 750 degrees C/450 MPa. gamma' cutting is the deformation mechanism of FGH97 alloy under 750 degrees C/450 MPa, stress concentration at grain boundary leads to initial cracks, which then propagate along grain boundary and finally lead to fracture. The disperse-distribution carbides on grain boundary can inhibit the propagation of microcracks.
引用
收藏
页码：2488 / 2493
页数：6
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