409 Ni基超合金MM247の疲労寿命に及ぼす鋳造組織の影響(OS3-2 疲労,OS3 エネルギー構造機器の健全性評価と信頼性の高度化3)

概要

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The effect of solidified structure on low cycle fatigue strength of Nibased superalloy MM247 was investigated. Two kinds of cast temperature were evaluated. The fatigue strength of the lower casting temperature specimen was lower than that of the higher casting temperature. Specimen observation for the solidified structure showed micro porosity exists in the lower casting temperature specimen. In the lower casting temperature specimen, the grain was found to solidified from the gate riser to center of the wheel. Therefore the center of the wheel solidified with micro porosity due to less riser effect. In the case of the higher casting temperature specimen, the grain was found to solidified from center of the wheel to the gate riser, therefore micro porosity was not found in the wheel. From the above results it can be concluded that high cast temperature is favorable to increase low cycle fatigue strength.
社団法人日本機械学会の論文
2005-11-03