INVESTIGATION OF SONIC TECHNIQUES FOR THE NONDESTRUCTIVE EVALUATION OF SINTERED IRON POWDER COMPACTS

摘要

Work relative to the development of nondestructive testing techniques for the inspection of sintered metal powder components is described* This study was necessitated by the fact that the major criteria for evaluation of sintered metal powder components, i.e., composition and density, do not alone adequately Insure quality or performance in applications where high strength and reliability are needed. The work described is concerned with the sonic testing of sintered electrolytic iron powder compacts. Ultrasonic and resonance techniques were utilized to investigate such factors as sound velocity and attenuation, resonant frequency, and damping capacity. These data were then correlated with processing variables, strength properties, and mlcrostructure.