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N. Saeidi,M. Jafari,J. G. Kim,F. Ashrafizadeh,H. S. Kim 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.2
A novel ferrite-53% austenite medium-Mn transformation induced plasticity (TRIP) steel with extraordinary combinationof 1420 MPa tensile strength and 27% elongation was produced by a simple designed thermomechanical treatment. Thedeformation and strain hardening behavior of this material were studied in detail using feld emission scanning electronmicroscopy and electron backscatter difraction examinations of diferent strained specimens. Exclusive strain hardeningbehavior observed in this new TRIP steel was found to be related to the severe grain refnement to less than 200 nm andaustenite grain disintegration within the frst 1% of applied strain. Moreover, it was shown that the deformation of highlyunstable retained austenite benefts the mechanical properties, since it could promote the severe grain refnement and subsequent uniform strain distribution within the microstructure of the TRIP steel. Finally, based on the strain hardening behavioranalysis a new and simple measurable criterion was introduced as a reliable replacement of traditional austenite stabilityparameter or the K value.