Process Parameters of Additive and Subtractive Hybrid Manufacturing for GH3536 Superalloy
GH3536 superalloy has excellent corrosion resistance and elevated-temperature strength,and is commonly used in the manufacturing of elevated-temperature components such as combustion chambers and gas turbines.Additive and subtractive hybrid manufacturing(ASHM)technology combines the advantages of high flexibility in additive manufacturing and good surface quality in subtractive manufacturing,which is an effective way to manufacture high performance GH3536 parts.Since ASHM engages the alternating of additive manufacturing and subtractive manufacturing,it is important to determine the optimal process parameters and suitable type of tools to improve the surface quality of GH3536 parts.The samples are prepared by selective laser melting with different process parameters.The relative density of the samples are measured by precision balance to obtain the optimal parameters for GH3536.Scanning electron microscopy and electron backscattering diffraction are used to observe the microstructure of GH3536 samples with optimal parameters.The samples of ASHM are machined with three different types of tools,i.e.ball end milling,round nose milling and flat end milling.The surface morphology is studied after the machining.The results show that with the laser power of 400 W and the scanning speed of 1750 mm/s,there are no obvious defects in the samples and the relative density reaches 99.93%which are the optimal process parameters in additive manufacturing.The surface roughness of the GH3536 samples processed by the round nose milling achieves 0.211 μm.This study provides guidance to the determination of process parameters and tools'type of ASHM for GH3536 parts.
GH3536 superalloyadditive and subtractive hybrid manufacturingselective laser meltingtool typesurface morphology
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