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5063137 
Journal Article 
Effect of isochronal annealing on the microstructure, texture and mechanical properties of a cold-rolled high manganese steel 
Pramanik, S; Saleh, AA; Pereloma, EV; Gazder, AA 
2018 
1 
Materials Characterization
ISSN: 1044-5803
EISSN: 1873-4189 
144 
66-76 
WOS:000447477300008 
A Fe-17Mn-3Al-2Si-lNi-0.06C wt.% steel was subjected to cold-rolling to 42% thickness reduction and isochronally annealed for 300 s between 500 and 850 degrees C. The high Mn steel was characterised via electron back scattering diffraction, transmission electron microscopy and uniaxial tensile testing. The reversion of deformation-induced epsilon and alpha'-martensite to austenite (gamma) was witnessed with the formation of fine twins in reverted/recovered gamma grains after annealing to 650 degrees C. The nucleation of new gamma grains at the boundary of reverted/recovered gamma grains was also noted. Upon reversion, the gamma orientations originated from the epsilon and alpha'-martensite orientations by phase transformation via the Shoji-Nishiyama and Kurdjumov-Sachs orientation relationships, respectively. Upon segmenting the gamma grains, the recrystallised gamma grains were observed to nucleate with orientations similar to those of the reverted/recovered gamma grains. Uniaxial tension on a fully recrystallised gamma microstructure showed that the initial gamma grain size has a more significant effect on the yield strength than the epsilon and alpha'-martensite fractions. On the other hand, the initial epsilon and alpha'-martensite fractions affect the total elongation. 
High Mn steel; Phase transformation; Transformation induced plasticity; Electron back-scattering diffraction (EBSD); Transmission electron microscopy (TEM)