Effects of Mo on the Precipitation Behaviors in High-Nitrogen Austenitic Stainless Steels

J Mater Sci Technol ›› 2011, Vol. 27 ›› Issue (12): 1125-1130.

• Iron and Steel • Previous Articles Next Articles

Effects of Mo on the Precipitation Behaviors in High-Nitrogen Austenitic Stainless Steels

Feng Shi¹⁾, Yang Qi^1,2), Chunming Liu²⁾

1) School of Science, Northeastern University, Shenyang 110004, China
2) Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110004, China

Received:2011-01-24 Revised:2011-05-19 Online:2011-12-28 Published:2011-12-24
Contact: C.M. Liu
Supported by:
the Program for Changjiang Scholars and Innovative Research Team in University under Grant No. IRT0713, the Fundamental
Research Funds for the Central Universities under Grant No. 90305001, the China Postdoctoral Science Foundation Funded Project under Grant No. 20090461186 and the Project of Department of Science and Technology of Liaoning Province Government under Grant No. 2007221007.

Abstract

Abstract: Precipitation behaviors of Fe-18Cr-18Mn-0.63N and Fe-18Cr-18Mn-2Mo-0.69N high-nitrogen austenitic stainless steels during isothermally aging at 850°C have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The experimental results show that precipitation displays a discontinuous cellular way and the precipitates are identified as Cr₂N in Fe-18Cr-18Mn-0.63N steel. The addition of Mo makes precipitation occur not only at the grain boundary but also inside the grain and precipitation also displays discontinuous cellular way. The precipitates at the grain boundary and in the cell are both identified as Cr₂N phase and χ phase and the precipitates inside the grain are identified as Χ phase in Fe-18Cr-18Mn-2Mo-0.69N steel. The nucleations of Χ phase and Cr₂N phase at the grain boundary are both governed by the diffusion of Cr atoms. The formation and growth of χ phase inside the grain are induced by the impoverishment of N atoms with increasing aging time.

Key words: Austenitic stainless steel, High nitrogen, Isothermal aging, Precipitation

Feng Shi, Yang Qi, Chunming Liu. Effects of Mo on the Precipitation Behaviors in High-Nitrogen Austenitic Stainless Steels[J]. J Mater Sci Technol, 2011, 27(12): 1125-1130.

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Effects of Mo on the Precipitation Behaviors in High-Nitrogen Austenitic Stainless Steels

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