Abstract：
:To gain the fundamental understanding of deformation mechanisms in an aluminum-containing austenitic high-Mn steel (Fe-32Mn-8.9Al-0.78 C (wt.%)), in-situ straining transmission electron microscopy (TEM) analysis is conducted. The in-situ observation during the deformation demonstrates that the plastic deformation is accommodated by the pronounced planar dislocation gliding followed by the formation of slip bands (SBs) and highly dense dislocation walls (HDDWs). Experimental evidences of the glide plane softening can be obtained from the interaction between the gliding perfect dislocations and the L'12 ordered precipitates in the austenite matrix. Furthermore, the observation of the localized cross-slip of dislocations at the slip band intersections enables to understand why slip bands are extensively developed without mutual obstructions between the slip bands. The enhanced strain hardening rate of the aluminum-containing austenitic high-Mn steels can be attributed to the pronounced planar dislocation glides followed by formation of extensive slip band which prevent premature failure by suppressing strain localization.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Kim SD,Park JY,Park SJ,Jang JH,Moon J,Ha HY,Lee CH,Kang JY,Shin JH,Lee THdoi
10.1038/s41598-019-51586-ysubject
Has Abstractpub_date
2019-10-23 00:00:00pages
15171issue
1issn
2045-2322pii
10.1038/s41598-019-51586-yjournal_volume
9pub_type
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