On Estimating the Porosity of Metals Obtained by Hot Isostatic Pressing Based on Analysis of Structural Acoustic Noise

The article considers the possibility of using a nondestructive spectral-acoustic method for quantitative control of the porosity of Kh12MF steel samples obtained by hot isostatic pressing. The results of studies of samples obtained at different stages of hot isostatic pressing in the residual porosity range from 0 to 9% are presented. The control technique is based on the analysis of acoustic structural noise parameters. Various methods of measuring parameters of structural noise are analyzed from the point of view of sensitivity and measurement error of the used informative parameters of structural noise. Clarified calculation algorithms for determining the parameters of structural noise are proposed, and the results of their experimental verification are presented. The obtained results can serve as a basis for developing an engineering method for assessing the degree of porosity of the material of parts and structural elements obtained by hot isostatic pressing, under operating conditions.