Shape Memory And Mechanical Properties Of Cold Rolled And Annealed Fe-17mn-5si-5cr-4ni-1ti-0.3c Alloy

In the present study, the shape, memory, and mechanical properties of cold-rolled and annealed Fe-17Mn-5Si-5Cr-4Ni-1Ti-0.3C (wt.%) alloy were investigated. The cold-rolled alloy was annealing heat-treated at different temperatures in the range of 500-900 degrees C for 30 min. The shape recovery behavior of the alloy was investigated using strip bending test followed by recovery heating. The microstructural evolution and the stress-strain response of the alloy heat-treated at different temperatures revealed that the recovery took place at a heat-treatment temperature higher than 600 degrees C. Recrystallization occurred when the heat-treatment temperature was higher than 800 degrees C. Meaningful shape recovery was observed only when the alloy was annealed at temperatures higher than 600 degrees C. The highest recovery strain of up to 2.56% was achieved with a pre-strain of 5.26% and recovery heating temperature of 400 degrees C, when the alloy was heat-treated at 700 degrees C. Conversely, the yield strength reduced significantly with increasing annealing heat-treatment temperature. The experimental observations presented in this paper provide a guideline for post-annealing heat-treatment when a good compromise between mechanical property and shape recovery performance is required.