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研究了高温时效对一种镍基单晶高温合金组织演变行为的影响。使合金在980,1050,1100℃,进行20,50,100 h的短期时效及在1100℃下进行200~800 h的长期时效,采用扫描电子显微镜进行组织形貌的观察、电子探针显微分析仪分析TCP相的成分,并对时效后的试样进行硬度测试。试验结果表明:在短期时效时,γ’相的粗化符合扩散控制理论的长大规律,即r3与t成正比,可求得不同温度的粗化长大系数;在长期时效下,1100℃时效400 h后,筏排状的γ’相形成且有TCP相析出,TCP相中富含Re和W元素;此外,在1050℃时效50 h及在1100℃时效20和100 h后,合金中也有TCP相的析出;硬度结果显示,不同时效条件的试样硬度值没有明显变化。
The effect of high temperature aging on the microstructure evolution of a nickel-based single crystal superalloy was investigated. The alloys were annealed at 980, 1050 and 1100 ℃ for 20, 50 and 100 h for short-term aging at 1100 ℃ for 200-800 h. SEM and SEM were used to observe the microstructure of the alloy. Electron microprobe The composition of the TCP phase was analyzed, and the hardness of the samples after aging was tested. The results show that the coarsening of γ ’phase accords with the law of growth of diffusion control theory in the short-term aging, that is r3 is proportional to t, and the coarsening and growth coefficients at different temperatures can be obtained. Under long-term aging, 1100 ℃ After 400 h aging, the raft-like γ ’phase was formed and TCP phase was precipitated. The TCP phase was rich in Re and W elements. In addition, after aging at 1050 ℃ for 50 h and aging at 1100 ℃ for 20 and 100 h, There is also precipitated TCP phase; hardness results show that the hardness of the specimen under different aging conditions did not change significantly.