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The single-pass hot compressions of two 5%Ni steels with and without niobium addition at different temperatures of 800-1 150℃and strain rates of 0.01-1s-1 were performed by using a Gleeble-3500 thermal simulator and the effect of niobium on the dynamic recrystallization ( DRX ) behavior was analyzed.The results showed that the niobium addition of 0.04% can retard DRX in 5%Ni steel significantly by increasing the activation energy for DRX from 394 to 462kJ / mol.The critical strain required for starting DRX in 5%Ni steel was increased by 0.04-0.10 with niobium addition when the steel was deformed at a strain rate of 0.01s-1 and temperatures varied from 950 to 1 000℃.The critical temperature required for starting DRX in 5%Ni steel was also increased from 1 000 to 1 050℃ with niobium addition when the steel was deformed at a strain rate of 0.1s-1 .Such a retarded DRX occurring in Nb-added 5%Ni steel can be attributed to the pinning effect of precipitates containing niobium.
The single-pass hot compressions of two 5% Ni steels with and without niobium addition at different temperatures of 800-1 150 ° C and strain rates of 0.01-1s-1 were performed by using a Gleeble-3500 thermal simulator and the effect of niobium The dynamic recrystallization (DRX) behavior was analyzed. The results showed that the niobium addition of 0.04% can retard DRX in 5% Ni steel significantly by increasing the activation energy for DRX from 394 to 462 kJ / mol. The critical strain required for starting DRX in 5% Ni steel was increased by 0.04-0.10 with niobium addition when the steel was deformed at a strain rate of 0.01s-1 and temperatures varied from 950 to 1 000 ° C. The critical temperature required for starting DRX in 5% Ni steel was also increased from 1 000 to 1 050 ℃ with niobium addition when the steel was deformed at a strain rate of 0.1s-1 .Such a retarded DRX occurring in Nb-added 5% Ni steel can be attributed to the pinning effect of precipitates containing niobium