Abstract
GH 909 alloy is a kind of low thermal expansion superalloy with high strength and low expansion coefficient. It is mainly used for manufacturing of aero-engine turbine casings, sealing ring, vanes and other gap control parts, to improve the working efficiency and thrust of the engine as well as to reduce gas loss and fuel consumption. However, the machinability is still a problem that restricts the application of GH909. This paper investigated the machinability referring to cutting forces, surface quality and tool wear in the milling process with carbide tool. The main conclusions are: (1) GH909 has similar machinability with other Nickel-based alloys, cutting velocity does not have great influence on cutting forces for small radial cutting depth. (2) Good machined surface quality can be get for cutting velocity around 70m/min. (3) To get good tool performance and reduce tool wear rate, cutting velocity can be set to no larger than 80m/min.
Highlights
GH 909 alloy is Fe-Ni-Co-based low thermal expansion superalloy, it has high strength, low expansion coefficient, almost constant modulus of elasticity under temperature below 650oC
This paper investigated the machinability referring to cutting forces, surface quality and tool wear in the milling process with carbide tool
Comparing forces with large radial cutting depth, cutting forces show an interesting dramatic increase with cutting velocity under large feed per tooth, while this phenomenon is not observed under the situation with small radial cutting depth
Summary
GH 909 alloy is Fe-Ni-Co-based low thermal expansion superalloy, it has high strength, low expansion coefficient, almost constant modulus of elasticity under temperature below 650oC. GH909 alloy is mainly used for manufacturing of aero-engine turbine casings, sealing ring, vanes and other gap control parts. The application of GH909 alloy can improve the working efficiency and thrust of the engine, and can reduce gas loss as well as fuel consumption. While used for manufacturing of aero-engine parts, machining of these parts either by turning or by milling is required. The published research is mainly about machining of Ni-based alloy 718, the machinability of alloy 909 is rarely studied. Motivated by the above analysis and requirements, the machinability of alloy 909 is studied in this paper
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