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.
Magnetic properties of mild steel under conditions of biaxial stress
As part of a project examining various magnetic nondestructive evaluation (NDE) methods for residual stress that might be applied to low-carbon structural steels, some magnetization characteristics of 0.13%-C steel are presented for a range of applied fields and stresses. The range of stresses is uniaxial to 160 MPa (tensile and compressive, parallel to magnetization) and equal biaxial up to 160 MPa (tensile and compressive). The range of applied fields is 100-500 A/m. Quantities presented (graphically) are peak flux density, remanent flux density, coercive field, and differential permeability. Some anhysteretic magnetization results are given for equal biaxial stresses in addition to a brief description of the equipment that was used to make the measurements. >