1009 環境共生形快削鋼(Bi鋼)の疲労強度に及ぼす複合表面改質の影響(オーガナイズドセッション : 表面改質材の機械的安全性保証)

概要

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The air valve shaft which is one of car components and frictional parts is used the led free-cutting steel, but this steel including lead is worth for recycling. So the recycling is better by changing with the bismuth Steel. Coated DLC-film, this shaft is improved the properties of tribology. But the fatigue reliability of the DLC-film isn't clarified. We tried the establishment of the fatigue reliability using fractgraphy. It is result of testing as follow. (1) DLC-film is inferior virgin on fatigue strength. (2) The minute crack which occurs by the slid observed on the nearly fracture surface DLC-film. (3) Residual stress on DLC-film is very high compressive residual stress. Therefore, fatigue strength of DLC-film is interior virgin.
2001-09-20