ニッケル基一方向擬固超合金Mar-M247LCのクリープ疲労寿命と繰返し構成関係

概要

論文の詳細を見る
This study investigates the effects of solidification direction on cyclic constitutive relation and creep-fatigue lives of Mar-M247LC Nickel-base directionally solidified (DS) superalloy.Strain controlled low cycle fatigue tests with 10 and 60 min.hold-times in tension were carried out at 1173K in air for three kinds of specimens of which loading direction was 0°,45°and 90°to the solidification direction.Step-up relaxation tests with a 10 min.tension hold-time were also conducted for the three kinds of specimens to determine the material constants used in the creep constitutive equation.Creep-fatigue lives were significantly affected by loading direction when the fatigue lives were correlated with the total strain renge ; the 0°specimen had the maximum creep-fatigue life and the 45°specimen had the minimum life.On the other hand, the cyclic stress range a better correlation of creep-fatigue lives for all the specimens, which showed that stress is a better parameter for the life prediction. An elastic-plastic-creep constitutive equation was developed taking account of the anisotropy of Young's modulus,and the equation successfully predicted the experimental stress amplitude.The creep-fatigue life prediction method was developed based on the constitutive equation.
社団法人日本材料学会の論文
1993-07-15