分别在1 573，1 323 K对UNS S31803双相不锈钢进行了固溶处理，再依次进行了冷轧和退火处理，利用电子背散射衍射和双环电化学动电位再活化法研究了该钢内界面特征分布和晶间腐蚀敏感性，并分析了二者之间的关系。结果表明：在1 573 K固溶并经冷轧退火后，试验钢得到了α+γ两相均匀分布的等轴组织，出现了大量满足K-S和N-W取向关系的低能相界，且α相中低界面能的小角度晶界所占比例超过50%，这些低能界面抑制了晶粒的长大，提高了试验钢的耐晶间腐蚀性能；在1 323 K固溶并经冷轧退火后，试验钢的显微组织为α+γ两相条带组织，满足K-S和N-W关系的相界较少，α相中以大角度晶界为主，其耐晶间腐蚀性能较差。

A UNS S31803 duplex stainless steel was treated by solid-solution at 1 573 K and 1 323 K, respectively, and then treated by cold rolling and annealing in sequence. The interfacial boundary character distribution and the susceptibility to intergranular corrosion of the steel were studied by the electron backscattered diffraction and double-loop electrochemical potentiokinetic reactivation method. The relationship between the two properties was analyzed. The results show that after solid-solution at 1 573 K followed by cold rolling and annealing, the equiaxed structure with evenly distributed α and γ phases was obtained in tested steel and a large number of low-energy phase boundaries with K-S and N-W orientation relationship appeared. The percentage of low-angle grain boundaries in α phase was over 50%. These low-energy boundaries hindered the growth of grains, resulting in the improvement of intergranular corrosion resistance of tested steel. After solid-solution at 1 323 K followed by cold rolling and annealing, the microstructure of tested steel was composed of band-like α+γ phases and the phase boundaries with K-S and N-W orientation relationship were relatively few. There were mainly high-angle grain boundaries in α phase. The intergranular corrosion resistance was relatively poor.