Physically realistic analytical treatment of soft impingement has been developed for solid-state precipitations in a non-isothermal process following the basic assumptions (i.e., a two-stage transformation including a site saturation of nucleation, an isotropic growth and a linear approximation for a concentration gradient in front of the precipitate/matrix interface). Based on the analytical treatment. Kissinger-like approach has been obtained to deduce the activation energy Q for diffusion during soft impingement in the non-isothermal process. (C) 2009 Elsevier B.V. All rights reserved.