フェライト系合金鋼のクリープ疲労寿命評価法の提案

概要

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Establishment of creep-fatigue life evaluation methods for high-temperature components in thermal power plants is important for assessment of remaining life. In this study, creep-fatigue tests were conducted by a high-temperature fatigue testing machine with two rotor materials and one boiler material. In order to study the creep damage mechanism during the stress relaxation process, a creep mechanism map was established based on the creep defomation theory. From the detailed comparison between the mechanism map and observed failure results, it was suggested that creep damage during relaxation should be divided into matrix creep damage and grain boundary creep damage. Considering these two types of damage for evaluation of creep damage during relaxation, a nonlinear damage accumulation model for creep-fatigue damage evaluation was newly proposed. Creep-fatigue life for all materials could be predicted well by a life prediction equation derived from the model.
一般社団法人日本機械学会の論文
1994-09-25