Intergranular Corrosion Behavior of 18.7Cr-5.8Mn-1.0Ni-0.23N Economical Duplex Stainless Steel Under Large Deformation Thermal Compression
LIU Zehui1, YANG Yinhui1,*, ZHANG Fengzhen2, WANG Liuhang1
1 School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China 2 Science and Technology Innovation Department of Kunming Iron and Steel Holding Co., Ltd., Kunming 650302, China
Abstract: The effect of deformation parameters in the range of 0.1—10 s-1/850—1 150 ℃ on the IGC resistance of 18.7Cr-5.8Mn-1.0Ni-0.23N economical DSS with 70% deformation hot compression in high and low concentration solutions was studied. The results show that higher solution concentration increased the discrimination of intergranular sensitivity value, and the deformation parameters affect the variation of grain refinement and the stability of passivation film in two phases. The occurrence of IGC mainly locates at the two-phase interfaces, and the Cr2O3 content plays a leading role in maintaining the stability of passive film, but the decrease of corrosion resistance is related to the decrease of the passive film compactness due to the enrichment of MnO content. The IGC sensitivity values after deformation at 1 s-1 and higher temperature are lower than that after solid solution treatment. When deformed at 0.1 s-1/1 050 ℃ and 1 s-1/1 050 ℃, the recrystallization refinement of austenite phase was contributed to enhance the stability and compactness of passive film, and then increase the IGC resistance, while the grain refinement of ferrite phase was conducive to its self-passivation. The passivated elements are not evenly distributed and the formation of high-density dislocations at phase boundaries reduced the IGC resistance when deformed at lower temperature of 850 ℃.
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2023, Vol. 37 
