Deep penetration into the Earth’s interior and direct monitoring of weak changes in physical fields and their cumulative processes and effects in the deep Earth can enhance the identification of deep Earth targets an...Deep penetration into the Earth’s interior and direct monitoring of weak changes in physical fields and their cumulative processes and effects in the deep Earth can enhance the identification of deep Earth targets and deepen the degree of knowledge of the details of the deep Earth structure and deep processes(Moskvitch,2014),which is important for promoting the development of Earth system science.展开更多
The duplex stainless steels(DSSs)are susceptible to thermal ageing embrittlement due to the spinodal decomposition and Gphase precipitation in the ferritic phase.This study presents a ternary(Fe-Cr-Ni)phase-field mode...The duplex stainless steels(DSSs)are susceptible to thermal ageing embrittlement due to the spinodal decomposition and Gphase precipitation in the ferritic phase.This study presents a ternary(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 theα-α′interfaces,similar to experimental observations.The kinetic synergy between spinodal decomposition and G-phase precipitation is discussed.The simulation results indicate that Gphase 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 management.展开更多
基金funded by the National Key Research and Development Program subject(Grant No.2018YFC1503903)
文摘Deep penetration into the Earth’s interior and direct monitoring of weak changes in physical fields and their cumulative processes and effects in the deep Earth can enhance the identification of deep Earth targets and deepen the degree of knowledge of the details of the deep Earth structure and deep processes(Moskvitch,2014),which is important for promoting the development of Earth system science.
基金the National Key Research and Development Program of China(Grant No.2017YFB0702201)。
文摘The duplex stainless steels(DSSs)are susceptible to thermal ageing embrittlement due to the spinodal decomposition and Gphase precipitation in the ferritic phase.This study presents a ternary(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 theα-α′interfaces,similar to experimental observations.The kinetic synergy between spinodal decomposition and G-phase precipitation is discussed.The simulation results indicate that Gphase 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 management.
