The Feasibility of Estimating Elastic-Plastic Strain in Powder Structural Steel with Different Residual Porosity by Magnetic Methods
The world’s output of products made of sintered powders is constantly growing due to high productivity and efficiency of powder metallurgy processe s. Safe operation of machine parts and structural components made of sintered powder ma t ials calls for reliable methods of nondestructive testing. The paper presents a procedure of t wo-parameter testing of product structure and porosity, as well as results of investigatio ns into the effect of tensile stresses on the magnetic characteristics of powder structural stee with different residual porosity; it also discusses the applicability of the results for estimat ing elastic-plastic strains.
Correlation between the stress-strain state parameters and magnetic characteristics of carbon steels
A method for reconstruction of the stress-strain diagrams of steel objects from their magnetic characteristics determined directly during tension has been suggested. The coercive force, residual induction in the major hysteresis loops, and the maximum magnetic permeability are recommended as parameters for nondestructive testing of stresses and strains.
Biaxial stress effects on hysteresis and MIVC
Abstract Changes in the magnetic properties of a cruciform-shaped SAE-4130 steel specimen were measured under biaxial stress conditions. Compared to model predictions are the experimental remanence at various biaxial stresses and the magnetically induced velocity changes (MIVC) of ultrasonic shear and longitudinal waves propagated perpendicular to the stress plane.