【摘 要】
：
The duplex stainless steels (DSSs) are susceptible to thermal ageing embrittlement due to the spinodal decomposition and G-phase precipitation in the ferritic phase.This study presents a temary (Fe-Cr-Ni) phase-field model for the simulation of spinodal d
【机 构】
：
The State Key Lab of Metal Matrix Composites,Shanghai Jiao Tong University,Shanghai 200240,China;Sch
论文部分内容阅读
The duplex stainless steels (DSSs) are susceptible to thermal ageing embrittlement due to the spinodal decomposition and G-phase precipitation in the ferritic phase.This study presents a temary (Fe-Cr-Ni) phase-field model for the simulation of spinodal decomposition with concurrent G-phase precipitation.Two Cahn-Hilliard equations and one Ginzburg-Landau equation are used in the model to describe the diffusion of Cr,Ni,and the growth of G-phase,respectively.The model is able to generate a spinodally-interconnected structure with G-phase particles near the α-α\'interfaces,similar to experimental observations.The kinetic synergy between spinodal decomposition and G-phase precipitation is discussed.The simulation results indicate that G-phase can enhance the evolution of spinodal decomposition by occupying the volume where the decomposition could otherwise occur,and that the system\'s elastic strain energy is largely contributed by G-phase rather than spinodal decomposition.These results would help in better understanding the states of the materials for plant structural integrity assessment and life man-agement.
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