号数ばね論文集51号(2006年)
ページ数pp.1-7
種類論文
論文名ばね腐食疲労におよぼすTi, V合金元素の影響
TitleEffects of Titanium and Vanadium on the Spring Corrosion Fatigue
著者吉原 直1) 茨木信彦1) 杉山充弘2) 丹下 彰2)
AuthorNao YOSHIHARA 1) Nobuhiko IBARAKI 1) Mitsuhiro SUGIYAMA 2) Akira TANGE 2)
抄録
Abstract0.4%C-Ti-V steel can enhance the suspension spring design stress comparing the common steel grades such as SAE 9260 or 9254 and has been increasingly applied to automobiles. Titanium and vanadium addition to this steel grade have the two significant features for improving spring corrosion fatigue property. Titanium and vanadium system precipitations lead to the fine austenite grain size with their pinning action. Furthermore tianium and vanadium system precipitations can trap the diffusible hydrogen in the steel during corrosion fatigue. Hydrogen trapping effect and austenite grain size refining can contribute to delay the fatigue crack propagation under the corrosion pit. It is cleared that titanimum has the larger effect than vanadium on the corrosion fatigue property, hydrogen embrittlement, and fracture toughness from this study and there is room for optimizing titanium and vanadium contents.
著者の所属1)蠖生誉醜歃蝓。押貌本発条
Belonging1)KOBE STEEL, LTD. 2)NHK SPRING CO., LTD.
Key WordsSuspension spring steel, Corrosion fatigue, Hydrogen embrittlement, Fracture toughness, Titanium