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Microstructure of the nitride layer of AISI 316 stainless steel produced by intensified plasma assisted processing

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2 Author(s)
Jiang, J.C. ; Materials Science and Engineering Program, Mechanical Engineering Department, Louisiana State University, Baton Rouge, Louisiana 70803 ; Meletis, E.I.

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Nitrided austenitic 316 stainless steel produced by intensified plasma assisted processing has been studied by transmission electron microscopy (TEM), high-resolution TEM, and image simulation techniques. Cross-sectional TEM studies showed that the nitride layer is composed of a single phase that was found to possess a simple cubic structure. This nitride is produced by introducing one N atom into one of the interstitial sites of the octahedra within the unit cell of the γ-austenite. The lattice constant of the nitrided simple cubic structure was determined to be a=3.78 Å, which is expanded by about 5.4% from that of austenite. Stacking faults, antiphase domains, and antiphase domain boundaries in the nitride layer were observed using dark-field and high-resolution TEM imaging. The evolution of the nitride phase seems to be preceded by lattice expansion and formation of stacking faults due to the presence of N and is consistent with the observed lattice constant reduction with depth. © 2000 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:88 ,  Issue: 7 )