Nitrogen-induced yield point phenomenon in an austenitic steel

Nitrogen-induced yield point phenomenon in an austenitic steel

Discrepancies remain about nature of dislocation-interstitial interaction governing yielding discontinuity in fcc materials. Here, we show that outward diffusion of nitrogen from stacking fault (SF) into matrix causes strain redistribution, leading to lowering stacking fault energy. Local fluctuatio...

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Veröffentlicht in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2020-02, Vol.774, p.138897, Article 138897
Hauptverfasser: Shin, J.-H., Jeong, J.-S., Lee, J., Kim, S.-D., Jang, J.H., Moon, Joonoh, Ha, H.-Y., Lee, T.-H.
Format: Artikel
Sprache:eng
Schlagworte:
Austenitic stainless steels
Nitrogen
Stacking fault
Stacking fault energy
Steel
Strain aging
Transmission electron microscopy
Yield phenomena
Yield point
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Zusammenfassung:Discrepancies remain about nature of dislocation-interstitial interaction governing yielding discontinuity in fcc materials. Here, we show that outward diffusion of nitrogen from stacking fault (SF) into matrix causes strain redistribution, leading to lowering stacking fault energy. Local fluctuation of nitrogen promotes fault growth coupled with nitrogen-enriched zone, contributing to enhanced plasticity. [Display omitted]
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2019.138897