Abstract
The purpose of this study is to X-ray line-profile analysis of the effect of rapid Joule heating and severe plastic deformation concurrently on microstructure and properties evolution in polycrystalline austenitic Fe-balanced superalloy EP718E, which is Inconel 718 derivative. The microstructure of superalloy at different stages of processing was examined by X-ray diffraction, by scanning electron microscopy, and by energy dispersive spectrometry techniques. The mechanical properties of evolution were studied by means of tension and high cycle fatigue testings. The results of X-ray study show that the intensity, raw areas, and net areas were a step–by–step changed according to processing routines. Is shown that under shear stress the fcc-crystallites were deformed and the peaks parameters by 2-Theta scale changed partly.
Highlights
In modern aircraft bypass turbofan engines [1] the most stressed parts, which define engine resource and lifetime extension, are the high pressure compressor (HPC) rotor blades
The objective of the current study is to review by X-ray line-profile analysis at different stages of samples processing the effects of the rapid Joule heating and severe plastic deformation (SPD) concurrently on microstructure evolution and properties improve of material
It was found that the application of electrical upsetting for production of preforms under precise isothermal forging of blades increases the fatigue strength to δ-1 = 520 MPa or about 30 % compared to conventional technology produced by hot extrusion followed hot rolling of preforms of HPC blade
Summary
In modern aircraft bypass turbofan engines [1] the most stressed parts, which define engine resource and lifetime extension, are the high pressure compressor (HPC) rotor blades. The influence of the rapid Joule heating by electric current with high density and severe plastic deformation (SPD) concurrently at different levels of heating rate and deformation degree have been studied in our own previous works [3, 17, 18] only This technique for exploitation properties of superalloy IN718 and EP718E improve called as electric upset forging (EUF) process. The objective of the current study is to review by X-ray line-profile analysis at different stages of samples processing the effects of the rapid Joule heating and severe plastic deformation (SPD) concurrently (at different levels EUF processing and at followed die forging) on microstructure evolution and properties improve of material
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