Abstract
A model of diffusing growth based on DICTRA software is employed to simulate the precipitating behavior of grain boundary carbide and the evolution of Cr-depletion region in alloy 690 after heat treatment at different temperatures for various times.It is concluded that the simulated Cr distribution in Cr-depletion region is in good agreement with the measured one,which verifies the reliability of the model of diffusing growth.The simulation results also indicates that there is a critical time,when the isothermal treatment time exceeds this time the Cr depleted degree will not change obviously;at last,according to the relation between carbide size and alloy corrosion resistant ability,a mathematic formula is founded to calculate the optimal isothermal treatment processing parameters.
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