Abstract
Cellular precipitation of Cr-rich nitrides was observed at an austenite–ferrite interface in 17-7 PH stainless steel after low-temperature nitridation. Fine-scale lamellar rocksalt-structured nitride (MN1−x , M: randomly distributed Fe, Cr, and Al) was identified at the interfaces between austenite and ferrite by local-electrode atom-probe tomography and transmission electron microscopy. The small size and spacing of the nitride lamellae reflect the low mobility of substitutional atoms under the conditions of low-temperature nitridation. Nitrides of the same structure were formed within the ferrite grain as extremely small particles. The face-centered cubic nitride precipitates in the Bain orientation relationship with the ferrite.
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Acknowledgments
The authors are grateful for the financial support from the NSF grant DMR-1104937, and grateful to the University of Michigan, School of Engineering for allowing access to the LEAP instrument, and A.H. Hunter for his assistance with the atom-probe analysis.
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Manuscript submitted July 9, 2013.
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Wang, D., Ernst, F., Kahn, H. et al. Cellular Precipitation at a 17-7 PH Stainless Steel Interphase Interface During Low-Temperature Nitridation. Metall Mater Trans A 45, 3578–3585 (2014). https://doi.org/10.1007/s11661-014-2302-5
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DOI: https://doi.org/10.1007/s11661-014-2302-5