Method of predicting creep remaining life of product degraded by heating and pressurization and calibration curve creating method used for this prediction method

摘要

To provide a method of predicting the remaining creep life of a product deteriorated by heating and pressurization. Namely, a step of setting an arbitrary evaluation range on the surface of the product, a step of obtaining the number and the length of the grain boundaries where the void exists within the evaluation range, a step of obtaining a grain boundary on each of the grain boundaries Determining the number of voids present and the length of the grain boundary direction, the number and length of the grain boundaries in which the voids obtained are present and the number of voids present on each of the obtained grain boundaries and A step of obtaining an M parameter based on a length in the grain boundary direction based on the following equation, and a step of obtaining a damage rate of the product from the obtained M parameter, wherein the product has a bainite structure. Estimate creep remaining life expectancy method.(1) (Wherein, M represents the number of grain boundaries where the void exists, N represents the number of voids present on each grain boundary, L_iRepresents the length of the i-th void existing on the -th grain boundary in the grain boundary direction, LRepresents the length of the -th grain boundary where the void exists. )