Abstract
The effect of tempering temperature on the microstructure and corrosion behavior of Cr12Ni3Co12Mo4W ultra-high-strength martensitic stainless steel was investigated using transmission electron microscopy, atomic force microscopy, X-ray diffraction, and electrochemical tests. The microstructures of the ultra-high-strength martensitic stainless steel consisted of some retained austenite and lath/plant martensite with the carbides distributed within the matrix and at the grain boundaries. Tempering of the steel for 4 h at various temperatures resulted in various carbide grain sizes and different amounts of the retained austenite. The results showed that larger carbide grains led to diminished corrosion resistance, whereas larger amounts of the retained austenite resulted in improved corrosion resistance. The steels exhibited good corrosion resistance in 0.017 mol/L NaCl solution and exhibited pitting corrosion in 0.17 mol/L NaCl solution. The martensite and prior austenite crystal boundaries dissolved in solution with pH 1.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 51171023), the Fundamental Research Funds for the Central Universities (No. FRF-TP-14-011C1), and National Basic Research Program of China (973 Program) (No. 2014CB643300).
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Li, HY., Dong, CF., Xiao, K. et al. Relationship Between Microstructure and Corrosion Behavior of Cr12Ni3Co12Mo4W Ultra-High-Strength Martensitic Stainless Steel. Acta Metall. Sin. (Engl. Lett.) 29, 1064–1072 (2016). https://doi.org/10.1007/s40195-016-0481-3
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DOI: https://doi.org/10.1007/s40195-016-0481-3