Abstract
Nickel-based superalloys are typical materials used in components of aeroengines and gas turbine machinery. The strength properties of these alloys at high temperatures are crucial not only to the performance (e.g., power generation efficiency, energy consumption, and greenhouse gas emissions) of aeroengines and industrial gas turbines, but also to machinability during component manufacturing. This study comparatively evaluated the surface integrity of two superalloys, AD730® and Inconel 718 (IN718), during high-speed finishing turning using cubic boron nitride (CBN) tools. IN718 is a conventional superalloy used for the hot section components of aeroengines and industrial gas turbines, while AD730® is a novel superalloy with enhanced high-temperature mechanical properties and good potential as a next-generation superalloy for these components. High-speed turning tests of two superalloys were conducted using a CBN cutting tool and jet stream cooling. The achieved surface integrity of the AD730® and IN718 superalloys was characterized and analyzed to assess the comparability of these alloys.
Highlights
Nickel-based alloys are widely used in aeroengine and gas turbine components, in those exposed to high temperatures, such as turbine discs and fasteners
Inconel 718 (IN718), a typical nicked-based superalloy, has been used as the major material for turbine discs due to its high temperature and oxidation resistance under operating temperatures in the range of 500~600 ◦C. This material is currently challenged by increased demands for energy efficiency and low emissions due to its limited maximum service temperature
This paper characterizes and analyzes the surface integrity obtained in the AD730® and IN718 alloys under the same machining conditions to assess the comparability of these superalloys
Summary
Nickel-based alloys are widely used in aeroengine and gas turbine components, in those exposed to high temperatures, such as turbine discs and fasteners These components are often crucial to aeroengine and gas turbine machinery due to their extreme operating conditions, which are characterized by severe mechanical and thermal loads [1]. Inconel 718 (IN718), a typical nicked-based superalloy, has been used as the major material for turbine discs due to its high temperature and oxidation resistance under operating temperatures in the range of 500~600 ◦C This material is currently challenged by increased demands for energy efficiency and low emissions due to its limited maximum service temperature. A novel nickel-based superalloy, AD730®, was developed by Aubert and Duval [2,3] for higher service temperatures (650~750 ◦C) This alloy can permit higher operating temperatures in aeroengines and gas turbines, thereby increasing energy efficiency and lowering emissions. Scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and X-ray diffraction were employed in characterizing the surface integrity of these alloys
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