Mechanism and kinetics of discontinuous precipitation of the η phase in the 36NKhTYu alloy

Н. И. Афанасьев, M. V. Radashin

2007

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DOI 10.1134/s0031918x07110075
Data confidence 70 medium
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Abstract

A new mechanism of nucleation and growth of cells of the η phase in the deformed 36NKhTYu austenitic alloy has been found. The recrystallization nuclei are formed at the η-phase particles, which were precipitated according to the continuous mechanism. Simultaneously, they are nuclei of cells of discontinuous decomposition. Unlike the known growth mechanism, the η-phase cell grows in all directions until it collides with other cells. The Peterman-Hornbogen theory of discontinuous precipitation has been modified to describe the kinetics of the complex reaction of discontinuous precipitation of the η phase and recrystallization and also the kinetics of complex reaction of discontinuous coalescence of grains and phases. The theoretical dependences of the cell size on the aging time for these reactions are proportional to t 1/3 and t 1/4, respectively. A comparison of the theoretical and experimental results has been performed.