低炭素鋼のクリープ形状および寸法効果

概要

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The effects of changes in shape and size of specimens on creep and rupture properties of low carbon steel were investigated on the plate specimens having various thickness (t_0), breadth (b_0) and parallel length (L_0). t_0 ranged from 2 to 30 mm , b_0 from 30 to 60 mm, and L_0 from 32 to 180 mm. L_0/√<A> (A : area of cross section) varied between 2 and 13.7. Creep and rupture tests were carried out at 450℃ and 550℃. It is shown that, with increasing L_0/√<A>, the rupture time decreases in the case of plate specimens when L_0/√<A>≦6, but it is constant when L_0/√<A>>6. On the other hand, it increases with L_0/√<A> in the case of round specimens when L_0/√<A>≦6. With increasing L_0/√<A>, the minimum creep rate increases in the case of plate specimens when L_0/√<A> is small, but it is constant when L_0/√<A>>6. The changes in t_0, b_0 and L_0 of the plate specimens affect both the rupture time and the minimum creep rate little if L_0/√<A> is maintained constant. In the case of short rupture time, the plate specimens with the dimensions of b_0/t_0>10 show the fracture oblique to the tensile axis across the broad sides. The angle of inclination made by the line of fracture is approximately 60゜.
社団法人日本材料学会の論文
1973-03-15