抄録
In the relation between OSD's parameter and logσ, two different linear relations were fourd to exist in the low and high stress regions. This behavior is due to two different kinds of mechanisms, intergranular fracture and transgranual fracture. The numerical constants calculated statistically from the short-time data can be used to extrapolate the long-time data. Based upon this relationship, a new calculable extrapolation method for creep rupture time under arbitrary stress and temperature was proposed. The difference between the predicted values and experimental values was also compared with the other time-temperature parameter methods for eight metallic materials. It was shown that the error of the present method was much smaller than those of the previously proposed methods viz. LM, OSD, MH, and MS methods.
