Estimation of Acoustic Anisotropy of ID Blade Utilizing Laser Excited Lamb Waves

Abstract

ID blade of metastable austenitic stainless steel shows strong anisotropy of acoustic or elastic properties due to heavy cold drawing and fracture susceptibility due to it anisotropy. The authors estimated elastic stiffness tensors from orientation dependencies of Lamb Ao and So velocities. Velocities of Rayleigh wave decreased by 400 m/s with the angle from rolling direction while sheet velocities increased by 500 m/s. Hydrogen charged ID blade showed higher velocities than that of as-received one.