Estimation of Elastic Stiffness in Austenitic Stainless Steels

Abstract

In austenitic stainless steels, the Young’s modulus ratio E₁₀₀/E_hkl in single crystal is expressed as a function of the orientation parameter Γ: E₁₀₀/E_hkl＝1－2.027Γ. Under the presumption that this relationship stands up on commercial stainless steels with various chemical composition, the elastic stiffness _cij was calculated as follows in connection with Young’s modulus Ep of poly crystal austenitic stainless steels: _c11＝1.0311Ep, _c12＝0.6864Ep, _c44＝0.6246Ep. As a result, the elastic stiffness ratio _c12/_c44 and the anisotropy parameter A_i (＝2_c44/(_c11－_c12)), that are required in the dislocation analysis by modified Williamson-Hall method, are estimated constant at _c12/_c44＝1.099 and A_i＝3.624.