Experimental Study and Kinetic Calculation on Migration of γ/α Interface Boundary During High Temperature Aging for 2205 Duplex Stainless Steel

摘要

Aging treatments in the temperature range of 1000 to 1200 ℃ for different time intervals(10,30,and 60 min)in a solution-treated 2205 duplex stainless steel(DSS)are carried out respectively.The migration of γ/α interface boundary after different aging treatments is measured by optical metallograph and calculated by DICTRA software.The experimental results are in agreement with calculated ones.The migration of γ/α interface boundary with increased keeping time depends on the chemical potential of chromium in each phase.At aging temperature of 1100 ℃,the back diffusion effect of chromium results in the opposite direction migration of γ/α interface.Therefore,the ferrite volume fraction is lower at first and then it is higher after 1800 s diffusion.