摘要
Warm deformation behavior of the Fe-6.5wt.%Si alloy was studied by isothermal compression in the temperature range of 300-700℃.The results show that the influence of the ordered phases on the flow stress gradually weakens with increasing deformation temperature.The flow stress of the furnace-cooled sample with the high degree of order at 300℃is higher than that of the quenched sample with the low degree of order,and the flow stresses of both samples are nearly the same at 500-700℃.The hardness difference between two samples deformed at 500℃gradually decreases with increasing strain,accompanying with a reduction in hardness of the furnace-cooled sample,which indicates a work-softening behavior.The analyses of dislocation configurations and ordered structure suggest that the dynamic recovery and deformation-induced disorder result in the work-softening behavior.An appropriate deformation temperature window for improving the formability of the Fe-6.5wt.%Si alloy is about 500-600℃.
基金
This work is financially supported by the National Natural Science Foundation of China(51471031,U 1660115)
the State Key Laboratory for Advanced Metals and Materials(2016Z-17).