Influence of nitrogen on corrosion behaviour of high nitrogen martensitic stainless steels manufactured by pressurized metallurgy

[Display omitted] •Pressurized metallurgy remarkably enhanced N content in martensitic stainless steel.•Increasing N content firstly decreased then increased the content of precipitates.•With increasing N content, main precipitates were converted from M23C6 to M2N.•High nitrogen martensitic stainles...

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Bibliographic Details
Published inCorrosion science Vol. 144; pp. 288 - 300
Main Authors Feng, Hao, Jiang, Zhouhua, Li, Huabing, Lu, Pengchong, Zhang, Shucai, Zhu, Hongchun, Zhang, Binbin, Zhang, Tao, Xu, Dake, Chen, Zhigang
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Ltd 01.11.2018
Elsevier BV
Subjects
A. Stainless steel
B. Polarization
B. XPS
C. Passive films
C. Pitting corrosion
Chromium nitride
Corrosion
Corrosion effects
Corrosion prevention
Corrosion resistance
Corrosion resistant steels
Impact resistance
Martensitic stainless steels
Metallurgy
Nitrogen
Pitting
Precipitates
Protective coatings
Solid solutions
Stainless steel
B. XPS
C. Passive films
C. Pitting corrosion
A. Stainless steel
B. Polarization
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Summary:[Display omitted] •Pressurized metallurgy remarkably enhanced N content in martensitic stainless steel.•Increasing N content firstly decreased then increased the content of precipitates.•With increasing N content, main precipitates were converted from M23C6 to M2N.•High nitrogen martensitic stainless steels exhibited excellent corrosion resistance.•Excess nitrogen deteriorated corrosion resistance of martensitic stainless steel. Effect of nitrogen on microstructure and corrosion behaviour of high nitrogen martensitic stainless steels manufactured by pressurized metallurgy was investigated by microscopy, electrochemical and spectroscopy analyses. Results indicated that increasing nitrogen content significantly enhanced the corrosion properties of martensitic stainless steels, while excess nitrogen deteriorated the corrosion resistance. The impacts of increased nitrogen content could be summarized as three aspects: the change of precipitation content and conversion of main precipitates from M23C6 to M2N; the enhanced protection performance of passive film by enrichment of Cr, especially Cr2O3 and CrN; the improved repassivation ability by increased nitrogen content in solid solution.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2018.09.002