Effect of Cold-rolling on Creep Behavior of a 10Cr-30Mn Austenitic Steel

Abstract

The effect of cold-rolling on creep deformation has been investigated for 10Cr-30Mn austenitic steels containing 0.003, 0.11 and 0.55 mass% carbon. After 20% cold-rolling at room temperature, the specimens were subjected to creep test at 873K for up to about 10000h. The test results were compared with those of solution-annealed specimens. The cold -rolling caused a decrease in minimum creep rate ε_min and an increase in time to rupture t_r at high stresses and short times. At low stresses and long times, however, the effect of cold-rolling on the ε_min and t_r depended on carbon concentration and test duration. The t_r of the specimens was described by t_r=1.45/(ε_min·Ω_p), where, Ω_p is the creep damage parameter given by Ω_p=dlnε/dε. Both the ε_min and Ω_p are correlated with the microstructural evolution during creep, such as the precipitation of σ phase, M₂₃C₆ and the recrystallization of deformed grains produced by cold-rolling.