Hamidreza Jafarian - School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST),
Ehsan Borhani - Department of Nano technology, Nano-Materials Science and Engineering group, Semnan University,

In this paper, microstructure and mechanical properties of austenite in Fe-24Ni-0.3C alloy subjected to accumulative roll bonding (ARB) process and subsequent annealing were studied. After 6 cycles of ARB process, elongated ultrafine-grained (UFG) austenite with mean grain size of 300 nm was obtained. Annealing treatment of 6-cycle ARB processed austenite at temperatures from 773 to 873 K resulted in formation of partly and fully recrystallized austenites with mean grain sizes between 750 nm to 2.5 μm.

Ultrafine-grains, Transformation induced plasticity (TRIP), Accumulative roll bonding (ARB), Microstructure