Abstract
Nondestructive evaluations of paramagnetic steels as SUS304, SUS316 and ferromagnetic steels as S25C, A533B have been experimentally investigated by using magnetic diagnosis tools. The crystal coherences of the induced martensitic phases in stainless steel by applied stresses showed a monotonic relationship with an average field for discontinuous magnetizations derived by magnetic Barkhausen noises, reflecting pinning forces of magnetic domain walls or degree of degradation. The coherence of small fractions of the martensitic phases decreased with increasing tensile stresses up to the fracture state of about 720 MPa. Monte-Carlo simulations have been successfully performed for nano-scale spin arrays of 50 x 50 x 50 spins with and without lattice voids of a half plane of 25 x 50 spins, which might be available to estimate the effects of degradation as a whole for nondestructive evaluation of structural materials.
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