10Cr-30Mn オーステナイト鋼のクリープ挙動に及ぼす冷間圧延の効果

概要

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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, M_<23>C_6 and the recrystallization of deformed grains produced by cold-rolling.
社団法人日本鉄鋼協会の論文
1995-08-01