Determination of the remaining life of metastable steel using acoustic and eddy current methods

The influence of cyclic deformation on the dynamic shear modulus and the content of the strain-induced martensite of metastable austenitic steel 12Kh18N10T was studied using acoustic and eddy current measurements. The intensity of the shear modulus change in the region of high- and low-cycle fatigue was investigated. A physical justification for separating the regions of high- and low-cycle fatigue based on the intensity of the shear modulus change was proposed. The stages of the shear modulus change were studied, reflecting the patterns of increasing the volume fraction of the strain-induced martensite. The dependences of the shear modulus of metastable steel on the volume fraction of strain-induced martensite were studied taking into account the formation of microdefects and relaxation of residual stresses at different values of the strain cycle amplitude. Expressions for determining the remaining life of the material based on acoustic and eddy current measurements were obtained.
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