Abstract
Annealing effects on microstructure and mechanical properties of the cryorolled Fe-25Cr-20Ni austenitic stainless steel were investigated by means of optical, scanning and transmission electron microscopy, X-ray diffraction, microhardness and mini-tensile testing. After 90% cryorolling, the grains of austenitic stainless steel were refined to the nanometer scale, and the nano-level grain size increased to the submicron scale after subsequent annealing. The recrystallization temperature of the cryorolled Fe-25Cr-20Ni steel was about 730°C. After annealing for 10min at 800°C, the microstructure was fully recrystallized, and the grain size was about 500nm. The growth of recrystallization grains occurred with further annealing temperature increase. After annealing for 10min at 1000°C, the grain size increased to about 2µm. Meanwhile, the elongation was nearly the same as the original un-deformed sample, but the yield strength and tensile strength is 2.3 and 1.5 times of the original un-deformed sample, and the toughness increased by 27%. Tensile fracture morphology changed from a mixture of quasi-cleavage and ductile fracture (before annealing) to typical ductile fracture (after annealing).
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