Short fatigue crack initiation at inclusions

Kaynak C. , Ankara A.

5th European Conference on Advanced Materials and Processes and Applications (EUROMAT 97), Maastricht, Netherlands, 21 - 23 April 1997, pp.45-48 identifier

  • Publication Type: Conference Paper / Full Text
  • City: Maastricht
  • Country: Netherlands
  • Page Numbers: pp.45-48


In this study, the initiation and early growth behaviour of short fatigue cracks in En7A steel with a high content of elongated MnS inclusions was investigated, by generating and evaluating data on the growth of short fatigue cracks under various stress levels and stress ratios for the six principal specimen orientations. Short cracks usually initiated at the debonded interfaces between the matrix and the inclusions. If there was no debonding, cracking sometimes occurred in the inclusions. In the early stages, short cracks propagated by a mechanism of inclusion influenced growth. Under low stress levels, usually one short crack was initiated which dominated most of the fatigue life, while under high stress levels there was multicrack interaction.