Dynamic strain aging effect during high-temperature tensile test of AL6XN super austenite steel

The tensile behavior of solution-treated AL6XN austenitic steels was investigated at 773-973 K and strain rates from 3.3×10-5 to 3.3×10-3 s-1.The results show that the serrated flow and plateaus in flow stress is observed for AL6XN steel during the hightemperature tensile-tests at above conditions(excluding 873 K,3.3×10-5 s-1),suggesting the occurance of dynamic strain aging.The critical strain of the serrated flow decreases with temperature increasing from 773 to 923 K,and the activation energy for the interaction between substitutional solutes,such as chromium,and molybdenum and dislocations is 304 kJ/mol,which is considered as the mechanism of dynamic strain aging.TEM observations reveal a planar slip mode for dislocations in the deformed AL6XN austenitic steel.