材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
ニッケル基一方向凝固超合金Mar-M247LCのクリープ疲労寿命と繰返し構成関係
長谷部 忠司坂根 政男大南 正瑛
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1993 年 42 巻 478 号 p. 868-873

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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 60min. 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 10min. 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 range; 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 gave 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.

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