The influence of hydrogen on ultra-high cycle fatigue properties of high strength spring steel 50CrV4

Acta Metall Sin

2008, Vol. 44

Issue (1): 64-68 DOI:

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The influence of hydrogen on ultra-high cycle fatigue properties of high strength spring steel 50CrV4

Yongde LI;shou xin LI;;;;;

沈阳中科院金属研究所疲劳部

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Yongde LI; shou xin LI. The influence of hydrogen on ultra-high cycle fatigue properties of high strength spring steel 50CrV4. Acta Metall Sin, 2008, 44(1): 64-68 .

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Abstract The influence of hydrogen on ultra-high cycle fatigue (UHCF) properties of high strength spring steel was discussed in this study. Three groups of specimens with different hydrogen content (CH) were obtained from three different heat treatment procedures: quenched and tempered (specimen QT), annealed at 380℃ in a vacuum after QT (specimen VA) and treated by High-pressure Thermal Hydrogen Charging (HPTHC) after QT (specimen HPTHC). It was observed by SEM that the crack initiation site was internal inclusion clusters for a high cycle fatigued specimen . The fatigue strength (σw) decreased according to σ0-аexp(CH)law with the increase of CH. Basquin exponent--b in Basquin Eq. decreased gradually with the increase of CH.

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Received: 23 July 2007

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