Notch Impact Behavior of Oxide Dispersion Strengthened (ODS) Fe20Cr5Al alloy

Abstract

In this paper tensile tests and LS and LT notched Charpy impact tests were performed at the temperature range between -196 and 200 °C on an oxide dispersion strengthened (ODS) Fe20Cr6Al0.5Y2O3 hot-rolled tube. The absorbed energy values in the range of high-temperatures of LS notched specimens is considerably higher than those of LT notched specimens; however such values tend to converge as temperature increases. Ductile fracture on the normal planes to RD with delaminations parallel to the tube surface were observed in the temperature range between RT and 200 °C. Delaminations of crack divider type were observed in LT specimens, whereas delaminations of crack arrester type were observed in LS specimens. The yttria particles in the grain boundaries and the transverse plastic anisotropy are the possible causes of that the delaminations were parallel to the tube surface