RESONANT FREQUENCY METHOD FOR NONDESTRUCTIVE EVALUATION OF SINTERED POWDER METAL AND INVESTMENT CAST PRODUCTS.
SPRINGFIELD ARMORY MASS
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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
- Fabrication Metallurgy
- Test Facilities, Equipment and Methods