Ma X.,Xian Aerospace Power Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015
Due to the complicated structure and high technical requirements, casting qualified rate of a gas turbine blade is very low, and the defects such as the core of the fault, the columnar crystal and the metallurgical inclusion are very high. Through the optimization of ceramic core manufacturing and the production process for the free end, the age rate of broken core is reduced. The grain refining agent and the method of wrapping the ceramic fibre were used to eliminate the columnar crystal defect at the exhausting side. By changing the filter network position and controlling dross, the metallurgical slag scrap rate was decreased. Based on the mentioned above, the quality of investment casting turbine blade was im-proved. © 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.
Sun Z.,Xian Aerospace Power Co. |
Zhang L.,Xian Aerospace Power Co. |
Chang T.,Xian Aerospace Power Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2012
Some cracks appear in the surface of milled K242 alloy fan-shaped positioned parts . Through analyzing crack, chemical composition and microstructure observation, it was presented that the crack on the surface of the fan-shaped positioned parts milled belongs to stress crack. And the factors resulting in the crack were investigated. Through optimizing casting process and machining process, stress crack in the parts during machining process was eliminated effectively.