M23C6 precipitation and Si segregation promoted by deep cryogenic treatment aggravating pitting corrosion of supermartensitic stainless steel
Xiao He1, Xin-yang Lü1, Zhi-wei Wu1, Shao-hong Li1, Qi-long Yong2, Jian-xiong Liang2, Jie Su2, Lie-xing Zhou3, Jun Li1, Kun-yu Zhao1
1 Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China 2 Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China 3 Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
Abstract：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 M23C6 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 °C. The sensitivity of the pitting corrosion potential was attributed to the precipitation of M23C6 carbides and Si atoms segregation. Si atoms segregation engendered the formation of Cr-depleted zone near M23C6 and impeded the recovery of Cr-depleted zone.
Xiao He,Xin-yang Lü,Zhi-wei Wu, et al. M23C6 precipitation and Si segregation promoted by deep cryogenic treatment aggravating pitting corrosion of supermartensitic stainless steel[J]. Journal of Iron and Steel Research International, 2021, 28(5): 629-640.
2021, Vol. 28 
