On Spectral-Acoustic Method for Estimating Porosity of Metals Produced by Hot Isostatic Pressing

The possibility of using various variants of the nondestructive spectral-acoustic method of monitoring porosity in sintered Kh12MF steel at various stages of its hot isostatic pressing in the range of residual porosity from 0 to 5% is considered. The existing approaches to porosity monitoring are analyzed. New algorithms are proposed that provide the possibility of express porosity monitoring on real objects with single-sided access and the inability of metal thickness gauging in the testing zone with the required accuracy. The results of experimental verification of measuring techniques based on the proposed algorithms are presented, and the corresponding errors and the limits of applicability are assessed.