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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 139-141Effects of N Content on Microstructure and...

Effects of N Content on Microstructure and Properties of SAF2906 Casting Super Duplex Stainless Steel after Cryogenic Treatment

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Abstract:

SAF2906 is a new kind of super duplex stainless steel, and more corrosion-resistant and strong than SAF2507, suitable to be used in the low temperature and corrosion conditions. In order to prevent the occurrence of microstructure changes resulting in the property deterioration, in the general, the castings made for SAF2906 should be cryogenically treated before they are used in the ultra low conditions. N is an alloying element, usually added to stainless steels to increase the material properties. So, In this paper, the effects of N content on microstructure, mechanical and corrosion resistance properties of SAF2906 casting super duplex stainless steel (SDSS) after cryogenic treatment were studied by means of Optical Microscope(OM), X-ray Diffraction(XRD) and electrochemical workstation. The results indicate that N can increase the amount of γ phase according to a linear relationship of Φ(γ)=99.4×w(N)+6.16. When N content is low or medial, γ phase can precipitate from ferrite. When N content is high, γ phase does not precipitate from ferrite and is converted directly from ferrite and austenite grain boundaries. The higher N content, the greater tensile strength and elongation, the better corrosion resistance. Compared with solution state, cryogenic treatment can improve corrosion resistance.

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Manufacturing Engineering and Automation I

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Periodical:

Advanced Materials Research (Volumes 139-141)

Pages:

670-676

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.139-141.670

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Online since:

October 2010

Authors:

Hong Liang Xiang, Dong Liu, Wei Lin Huang, Fu Shan He

Keywords:

Corrosion Resistance, Cryogenic Treatment, Duplex Microstructure, Mechanical Property, N Content, SAF2906 Casting Super Duplex Stainless Steel

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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