Research On Relationship Between Superalloy GH4169with The Ultrasonic Propagation Characteristics

Superalloy material microstructure determines its mechanical properties, theconventional method for the analysis of material microstructure metallographicmethod, causing material damage, parts wasted time consuming. High-temperaturealloy GH4169thesis for the study, using ultrasonic nondestructive method formeasuring ultrasonic wave propagation in high-temperature alloy GH4169material inthe process of evaluation of some of the features of its microstructure.Paper using ultrasonic scanning system for flooding two specimens ultrasounddata acquisition.By ultrasonic pulse reflection method measured the speed of soundsamples, while taking advantage of several samples measured by pulse emissionsound attenuation coefficient. Scattering measurements effective voltage valuecorresponding to the time-domain waveform amplitude. Flooding scanning the sampledata obtained by Fourier transform and a bottom end of the second wave peakfrequency wave peak frequency samples.Test specimens obtained by optical method microstructure photos. According toGB6394-2002standard measured by the area of the grain size of the sample level:a group of specimens mostly7.5-8.0level and the group B-1B Sample5.5-6.0level, while Samples B-2level is9.0-9.5,8.0-8.5Sample B-3level, the sample levelof6.5to7.0B-4, B-58.5-9.0sample stage, the sample B-6is a7.5-8.0level. Grainsize of the sample specimen ultrasound characteristics combined analysis results:Velocity and grain size relationships: V=5898.8-2.96D,sample sound velocity withincreasing grain size decreases; Sound attenuation and the grain size: α=0.047+0.00426D, with a sample attenuation coefficient of the grain size increases; Sampleone end and the second end of the wave peak frequency wave peak frequency withincreasing grain size decreases; Scattering sample voltage with a grain size increases.Papers from scattering caused by experimental analysis GH4169grain Rayleighscattering, because the grain size increases gradually causing serious acousticscattering, acoustic scattering is a cause of sound attenuation. Because of theincreased size of the sample may lead to reduced grain sample elastic modulus, andthus also decreases the speed of sound.Paper provides guidance combined with comparative analysis of the testsample microstructure by high-temperature alloy GH4169ultrasound characteristics, tries to study the microstructure uniformity evaluate its methods of ultrasound throughthe material characteristics, thus achieving high-temperature alloy GH4169nondestructive evaluation microstructure of the material rolled Process Improvement.