EFFECT OF ENVIRONMENTS ON FATIGUE BEHAVIOUR OF A DUAL-PHASE STEEL

Acta Metall Sin

1988, Vol. 24

Issue (3): 193-199 DOI:

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EFFECT OF ENVIRONMENTS ON FATIGUE BEHAVIOUR OF A DUAL-PHASE STEEL

AI Suhua;WANG Zhongguang Institute of Metal Research; Academia Sinica; Shenyang

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AI Suhua;WANG Zhongguang Institute of Metal Research; Academia Sinica; Shenyang. EFFECT OF ENVIRONMENTS ON FATIGUE BEHAVIOUR OF A DUAL-PHASE STEEL. Acta Metall Sin, 1988, 24(3): 193-199.

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Abstract Corrosion fatigue behaviour of an as-rolled dual-phase steel has beeninvestigated in tap water or 3.5%NaCl agueous solution under full immersion andintermittent wetting. It was found that in comparison with the data in air, expo-sure to either tap water or salt water results in a substantial reduction in fatiguelife and intermittent wetting later shows the most harmful effects. However, underthe same aggressive condition, the corrosion environments become more and moreharmful while the stress level decreases. A combined observation of fracture surfacewith the flat free surface in SEM shows that corrosion fatigue cracks initiateoften at corrosion pits resulted from the anodic dissolution. In addition, the inter-action between hydrogen and crack tip is considered another important factorwhich controls the crack initiation and propagation in corrosion fatigue. The mar-tensite exhibits a higher resistance to corrosion fatigue than the ferrite matrix.

Key words: corrosion fatigue crack iniciation propagation of crack corrosion pits intermittent wetting

Received: 18 March 1988

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