Accession Number : AD0632955

Title :   RESONANT FREQUENCY METHOD FOR NONDESTRUCTIVE EVALUATION OF SINTERED POWDER METAL AND INVESTMENT CAST PRODUCTS.

Descriptive Note : Technical rept.,

Corporate Author : SPRINGFIELD ARMORY MASS

Personal Author(s) : Fowler,K. A. ; Hatch,H. P.

Report Date : 06 MAR 1966

Pagination or Media Count : 27

Abstract : The initial phase of a continuing study of nondestructive test methods for potential application to sintered powdered metals is described. Measurements of natural mechanical resonant frequency and ultrasonic velocity have been successfully applied to the nondestructive evaluation of tensile strength of sintered iron test specimens. Empirical relationships between tensile strength and the velocity of sound propagation have been developed. These relationships are based on the fact that the disposition of residual porosity, which includes the size, shape, and distribution of the pores, simultaneously influences both the tensile strength and sonic velocity of sintered iron powder compacts. (Author)

Descriptors :   (*CASTINGS, NONDESTRUCTIVE TESTING), (*NONDESTRUCTIVE TESTING, RESONANT FREQUENCY), (*POWDER METALLURGY, NONDESTRUCTIVE TESTING), POWDER METALS, SINTERING, ULTRASONIC PROPERTIES, TENSILE PROPERTIES, ULTRASONIC RADIATION, SOUND TRANSMISSION

Subject Categories : Fabrication Metallurgy
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE