Analysis of Magnetism in High Nitrogen Austenitic Stainless Steel and Its Elimination by High Temperature Gas Nitriding

J Mater Sci Technol ›› 2011, Vol. 27 ›› Issue (12): 1139-1142.

• Iron and Steel • Previous Articles Next Articles

Analysis of Magnetism in High Nitrogen Austenitic Stainless Steel and Its Elimination by High Temperature Gas Nitriding

Peng Wan^1,2), Yibin Ren¹⁾, Bingchun Zhang¹⁾, Ke Yang¹⁾

1) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2) Graduate School of Chinese Academy of Sciences, Beijing 100049, China

Received:2010-05-10 Revised:2010-07-16 Online:2011-12-28 Published:2011-12-24
Contact: Y.B. Ren
Supported by:
National Natural Science Foundation of China (No. 31000428) and National Basic Research Program of China (973 Program) (No. 2012CB619101)

Abstract

Abstract: Stable austenitic structure in medical stainless steels is basically required for surgical implantation. A weak magnetism was found in a high nitrogen nickel-free austenitic stainless steel for cardiovascular stent application. This magnetic behavior in high nitrogen stainless steel was investigated by optical microscopy, X-ray diffraction (XRD), electron probe microanalysis (EPMA) and superconducting quantum interference device (SQUID). The results showed that the magnetism came from the composition segregation of ferrite formation elements such as Cr and Mo in the steel and some δ-ferrites were locally formed during the pressurized electroslag remelting process. The magnetism of high nitrogen stainless steel could be eliminated by a proper high temperature gas nitriding (HTGN).

Key words: High nitrogen stainless steel, High temperature gas nitriding, Ferrite, Magnetism

Peng Wan, Yibin Ren, Bingchun Zhang, Ke Yang. Analysis of Magnetism in High Nitrogen Austenitic Stainless Steel and Its Elimination by High Temperature Gas Nitriding[J]. J Mater Sci Technol, 2011, 27(12): 1139-1142.

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Analysis of Magnetism in High Nitrogen Austenitic Stainless Steel and Its Elimination by High Temperature Gas Nitriding

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