カスタービン翼用耐熱合金の熱疲労強度に及ぼす材質の変化の影響

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In this paper is described the effect of change in property of the materials for gas turbine blade, such as Inconel 700, Inconel X, etc., due to their heating for a long period of time, on their thermal fatigue strength. The thermal fatigue test was carried out by applying the burner heating method on knife-edge type specimens. The results are summarized as follows : (1) In prolonged heating, the material showed overage-softening after a certain period of age-hardening. but its ductility and toughness decreased gradually. In this case, its thermal fatigue strength increased during age-hardening. but decreased during overage-softening just as in the case of experiment with its stress rupture strength. (2) From above mentioned relation between hardness and strength it was found that tracking of changes in the hardness of these materials is a useful means for the evaluation of the durability and the time for replacement of the turbine blade in use. (3) The correlation between hardness and thermal fatigue strength mentioned above is consi-dered to depend on the proportional relation between the change of plastic strain range and that of 0. 2% proof stress, but this is not the Only reason to explain these facts, and also there is some room to examine the relation between thermal fatigue strength and reduction of area in tensile test. It seems that precise examination of thermal fatigue strength needs further experiments. (4) The experimental results decided by the estimated strain in the edge of the test specimen dispersed from 1 to 1/10 of the calculated life according to modified Coffin-Langer's formula which corresponded to I to 1/2 of the calculated strain range. It was the aim of this testing method to make qualitative comparison of thermal fatigue lifo of materials, and it is also applicable to making their quantitative examination approximately.
社団法人日本材料学会の論文
1970-03-15

カスタービン翼用耐熱合金の熱疲労強度に及ぼす材質の変化の影響

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