抄録
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 εmin and an increase in time to rupture tr at high stresses and short times. At low stresses and long times, however, the effect of cold-rolling on the εmin and tr depended on carbon concentration and test duration. The tr of the specimens was described by tr=1.45/(εmin·Ωp), where, Ωp is the creep damage parameter given by Ωp=dlnε/dε. Both the εmin and Ωp 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.
