AUTHOR=Liu Qian , Jiang Jiaxuan , Chen Ming , Deng Xiaohu , Wang Jiangang , Ju Dongying 

TITLE=Study on the mechanism of carbide precipitation by surface quenching treatment on GCr15 bearing rings based on the phase-field method

JOURNAL=Frontiers in Materials

VOLUME=9

YEAR=2022

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2022.978025

DOI=10.3389/fmats.2022.978025

ISSN=2296-8016

ABSTRACT=<p>In this paper, the thermodynamics database describing Gibbs free energy of <italic>FCC</italic> phase and <italic>M<sub>23</sub>C<sub>6</sub></italic> phase based on <italic>Fe-Cr-C</italic> ternary alloy was coupled into phase field simulation, and the phase field model was developed on the mesoscopic scale which simulates precipitation, growth and coarsening of <italic>M<sub>23</sub>C<sub>6</sub></italic> carbides in <italic>FCC</italic> austenitic matrix by considering the elastic energy. As the boundary condition of imported phase field calculation, the heat treatment COSMAP software was applied to obtain the macro numerical simulation results of quenching. The phase composition, element distribution, and the evolution including the nucleation, growth and coarsening was simulated by phase field method for the <italic>M<sub>23</sub>C<sub>6</sub></italic> carbides in quenching process of GCr15 bearing ring. By means of comparison between the calculation results of phase field simulation and the morphology, quantity and distribution of carbides observed by SEM experiment, this paper present the mechanism on precipitation of micro <italic>M<sub>23</sub>C<sub>6</sub></italic> carbides influenced by quenching process parameters, and the experiment verifies the feasibility and accuracy of phase field simulation.</p>