Effects of temperature cycling and nitrogen on the stability of microstructures in austenitic stainless steels

The influence of temperature cycling from room temperature to 77 K on nitrogen-alloyed austenitic stainless steels, Fe24Mn13Cr0.4N, Fe24Mn18Cr3Ni0.6N, Fe1Mn19Cr8Ni0.2N and Fe17Mn14Cr1Ni0.4N, has been studied by optical microscopy and scanning electronic microscopy (SEM). Results show that the phase...

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Veröffentlicht in:	Materials characterization 2008-01, Vol.59 (1), p.18-22
Hauptverfasser:	Yuan, Z.Z., Dai, Q.X., Zhang, Q., Cheng, X.N., Chen, K.M.
Format:	Artikel
Sprache:	eng
Schlagworte:	AUSTENITE Austenitic stainless steels AUSTENITIC STEELS CHROMIUM ALLOYS Cross-disciplinary physics: materials science rheology Exact sciences and technology MANGANESE ALLOYS MARTENSITE MATERIALS SCIENCE MICROSTRUCTURE NICKEL ALLOYS NITROGEN OPTICAL MICROSCOPY Phase diagrams and microstructures developed by solidification and solid-solid phase transformations Phase transformation PHASE TRANSFORMATIONS Physics SCANNING ELECTRON MICROSCOPY Solidification STABILITY STRESSES TEMPERATURE DEPENDENCE TEMPERATURE RANGE 0273-0400 K
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Zusammenfassung:	The influence of temperature cycling from room temperature to 77 K on nitrogen-alloyed austenitic stainless steels, Fe24Mn13Cr0.4N, Fe24Mn18Cr3Ni0.6N, Fe1Mn19Cr8Ni0.2N and Fe17Mn14Cr1Ni0.4N, has been studied by optical microscopy and scanning electronic microscopy (SEM). Results show that the phase transformation from austenite to ε martensite takes place due to the temperature cycling and stress concentration, whereas nitrogen can stabilize the austenitic microstructures greatly. Finally, the mechanism of the phase transformation and the structure of ε martensite are discussed in detail.
ISSN:	1044-5803 1873-4189
DOI:	10.1016/j.matchar.2006.10.011