MODELING ULTRASONIC GRAIN NOISE WITHIN Ti-6Al-4V FORGINGS

摘要

Large variations of backscattered ultrasonic grain noise levels have been observed within Ti-6Al-4V forgings. Such noise variations are believed to be correlated with the microstructural variations that occur during the forging processing. A modeling effort is made to try to correlate the ultrasonic grain noise with available microstructure information. One model input is the local deformation caused by the forging process, as calculated using DEFORM software. From this local deformation the elongations and orientations of microstructural scattering elements are determined. Other model inputs are the mean volume of a scattering element and a parameter that quantifies the elastic property variation between scatterers. For one particular forging, the grain noise levels predicted by the model at various locations are compared with experiment.