Abstract
The corrosion fatigue propagation behaviours and mechanisms of quenched and tempered AISI 4340 and 4135 steels have been systematically investigated in 3.5% NaCl spray and in 3.5% NaCl solution. The crack closure for AISI 4135 steel has been studied in 3.5% NaCl spray and in air. It is shown that there is a great crack arrest tendency in 3.5% NaCl spray but no crack arrest in 3.5% NaCl solution. The crack closure effect for AISI 4135 steel is higher in 3.5% NaCl spray than in air because of thick oxide deposits within the crack. Through detailed analyses and SEM fractographic examination, it is found that the dominant crack growth mechanism is crack tip anodic dissolution in 3.5% NaCl spray but is hydrogen embrittlement in 3.5% NaCl solution. In this paper, a crack closure blunting model is presented for crack arrest. It is proposed that crack arrest is caused by the combined effects of crack closure and crack tip blunting. The crack arrest tendencies and corrosion fatigue parameters such as frequency, stress ratio and crack tip anodic current density can be predicted and described qualitatively by this model.
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