The microstructure evolution and the pitting corrosion resistance of a supermartensitic stainless steel after deep cryogenic treatment process were clarified through X-ray diffraction,field emission scanning electron ...The microstructure evolution and the pitting corrosion resistance of a supermartensitic stainless steel after deep cryogenic treatment process were clarified through X-ray diffraction,field emission scanning electron microscopy,transmission electron microscopy(TEM)and electrochemical methods.The results showed that the microstructure of supermartensitic stainless steel mainly consisted of reversed austenite,tempered martensite,and M_(23)C_(6)carbides after tempering.The deep cryogenic treatment promoted the refinement of the martensite laths and the precipitation of the carbides in comparison with the traditional process.TEM analysis indicated that the segregation of Si atoms at the boundary was found at the interface between carbide and martensite.The pitting corrosion potential of the specimens subjected to deep cryogenic treatment decreased with the elevated tempering temperature,and the lowest pitting corrosion potential was found at the tempering temperature of 650℃.The sensitivity of the pitting corrosion potential was attributed to the precipitation of M_(23)C_(6)carbides and Si atoms segregation.Si atoms segregation engendered the formation of Cr-depleted zone near M_(23)C_(6)and impeded the recovery of Cr-depleted zone.展开更多
基金The authors gratefully acknowledge the financial support received from the Central Iron and Steel Research Institute and the Research Center for Analysis and Measurement of Kunming University of Science and Technology(No.2017M20152230069).
文摘The microstructure evolution and the pitting corrosion resistance of a supermartensitic stainless steel after deep cryogenic treatment process were clarified through X-ray diffraction,field emission scanning electron microscopy,transmission electron microscopy(TEM)and electrochemical methods.The results showed that the microstructure of supermartensitic stainless steel mainly consisted of reversed austenite,tempered martensite,and M_(23)C_(6)carbides after tempering.The deep cryogenic treatment promoted the refinement of the martensite laths and the precipitation of the carbides in comparison with the traditional process.TEM analysis indicated that the segregation of Si atoms at the boundary was found at the interface between carbide and martensite.The pitting corrosion potential of the specimens subjected to deep cryogenic treatment decreased with the elevated tempering temperature,and the lowest pitting corrosion potential was found at the tempering temperature of 650℃.The sensitivity of the pitting corrosion potential was attributed to the precipitation of M_(23)C_(6)carbides and Si atoms segregation.Si atoms segregation engendered the formation of Cr-depleted zone near M_(23)C_(6)and impeded the recovery of Cr-depleted zone.
