Accession Number : ADA134054

Title :   Grain structure Identification by UltraSound Frequency Averaging and Deconvolution.

Descriptive Note : Final rept. 1 Jun 81-31 Aug 82,


Personal Author(s) : Furgason,E S

PDF Url : ADA134054

Report Date : Jul 1983

Pagination or Media Count : 40

Abstract : The objective of this research program was to develop a technique to nondestructively measure average grain size as a function of position and to also provide some measure of the size distribution of the scatterers. To nondestructively evaluate the microstructure, the material was probed using broad-band ultrasound. The resulting backscattered ultrasound echoes were then processed to obtain the required microstructure parameters by applying techniques adapted from our previous work on Flaw Enhancement in large grain materials. Previous work on nondestructive microstructure evaluation has centered on obtaining a single parameter related to the average grain size in a relatively large volume of material. In contrast, this research effort was directed toward evaluating the local microstructure of the material as function of position. This does not imply a point-by-point mapping of grain size, but rather the evaluation of grain statistics within small volumes of the bulk material.

Descriptors :   *Microstructure, *Nondestructive testing, *Ultrasonics, *Grain size, Measurement, Backscattering, Echoes, Structural properties, Broadband, Grain structures(Metallurgy), Parametric analysis, Computations, Bulk materials

Subject Categories : Properties of Metals and Alloys
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE