Abstract
Abstract Fatigue tests have been conducted both in laboratory air and using an intermittent air/corrosion fatigue sequential cycling technique. All tests were performed on smooth specimens made from a quenched and tempered steel and subjected to fully reversed torsional loading. Crack initiation and growth behaviour was recorded using a surface replication technique. Debonding at the metal matrix/ inclusion interface appears to be the main cause of the formation of short cracks. The growth of these short cracks dominates the fatigue lifetime, being significantly influenced by the material microstructure. Empirical models for short and long crack growth were developed by employing elastic plastic fracture mechanics parameters to predict the total fatigue life of a specimen. Later, these crack growth equations derived from air fatigue tests conducted at stresses above the fatigue limit were applied to the crack growth results obtained from intermittent air fatigue/corrosion fatigue tests carried out at sub-fatigue limit stress levels. A reasonable agreement was observed between predicted and experimental crack growth rates
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