Fatigue crack growth of powder metallurgy (P/M) processed steels was investigated. It was found that heterogeneous microstructures play an important role in the fatigue crack behavior of P/M steels. In particular, porosity significantly influences fatigue crack growth. It was also found that an increase in porosity and R-ratio results in a decrease in DKth values. An increase in the R-ratio and porosity increases the monotonic contribution during fatigue due to strain localization between pores at the crack tip.
|Original language||English (US)|
|Number of pages||11|
|Journal||International Journal of Powder Metallurgy (Princeton, New Jersey)|
|State||Published - Jan 1 2005|
ASJC Scopus subject areas
- Metals and Alloys
- Industrial and Manufacturing Engineering