Relationship Between Microstructure and Corrosion Behavior of Cr12Ni3Co12Mo4W Ultra-High-Strength Martensitic Stainless Steel

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 t...

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Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2016-11, Vol.29 (11), p.1064-1072
Main Authors: Li, Hui-Yan, Dong, Chao-Fang, Xiao, Kui, Li, Xiao-Gang, Zhong, Ping
Format: Article
Language:English
Subjects:
Carbides
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Corrosion effects
Corrosion potential
Corrosion resistance
Corrosion resistant steels
Electrodes
Grain boundaries
Grain size
High strength
Martensite
Martensitic stainless steels
Materials Science
Mechanical properties
Metallic Materials
Microscopy
Microstructure
Nanotechnology
Organometallic Chemistry
Pitting (corrosion)
Retained austenite
Sodium chloride
Spectroscopy/Spectrometry
Stainless steel
Temperature
Tempering
Transmission electron microscopy
Tribology
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Summary: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 Na Cl solution. The martensite and prior austenite crystal boundaries dissolved in solution with pH 1.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-016-0481-3