Dynamic process of trace boron non-equilibrium grain boundary segregation and the effect of cooling rate

Ping Wu, Xinlai He, Bing Cao, and Sen Chen Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China; Applied Science School, University of Science and Technology Beijing, Beijing 100083, China; Editorial Department of J. Univ. Sci. Technol. Beijing, Beijing 100083, China

摘 要：<正> The dynamic process of non-equilibrium grain boundary segregation of trace boron in Fe-40%Ni alloy during cooling and the effect of cooling rate were investigated by boron tracking autoradiography technique. The results indicate that during cooling process, the amount of segregated boron on grain boundary firstly increases fast, then enters a comparatively even increasing stage and increases rapidly again at the third stage. The details of each stage varied with cooling rate are explained. When the segregation develops to a certain degree, the segregated boron atoms transform from solute status to precipitate status.

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