SUS 304鋼のクリープ挙動に及ぼす変動荷重の影響

概要

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Intermittent loading creep tests were carried out on SUS 304 austenitic steel over a broad stress range. and its creep deformation, life and rupture ductility under intermittent loading were compared with those data under constant loading. The creep deformation (minimum creep rate) under intermittent loading decelerated at 600℃ and at 700℃ as compared with that under constant loading except the case of high stress at 600℃, and its value approached gradually to zero with decreasing stress. In these cases, the fracture mode showed an intergranular nature, and the rupture ductility for intermittent loading was lower than that for constant loading. In the case of high stress at 600℃, the transgranular mode of fracture was observed and the ductility for the both types of loading showed a similar trend. The dependence of life (t_R) on the minimum creep rate (ε^^・_<min>) under intermittent and constant loading was shown by the relation log t_R/ε_<cp>∝log ε^^・_<min> where ε_<cp> is the total creep strain.
社団法人日本材料学会の論文
1978-10-15