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Journal of Electron Microscopy 48(4): 431-435 (1999)
© 1999 Oxford University Press

Effect of Ti and Nb additions on Cr depletion at grain boundaries in austenitic stainless steel irradiated with 1 MeV electrons at 523–673 K

Shigeki Kasahara1,*, Kiyotomo Nakata1, Jiro Kuniya1 and Heishichiro Takahashi2

1The 2nd Department of Materials Research, Hitachi Research Laboratory Hitachi Ltd, 7-1-1 Ohmika-cho, Hitachi-shi, Ibaraki 319-1221
2Center for Advanced Research of Energy Technology, Hokkaido University Kita 13, Nishi 8, Kita-ku, Sapporo 060-8628, Japan

*To whom correspondence should be addressed. E-mail: shigekik{at}mx5.nisiq.net

Radiation-induced chromium (Cr) depletion at grain boundaries (GB) is known as one of the major phenomena to degrade corrosion resistance of austenitic stainless steel. Electron irradiation is commonly used as a simulation of neutron irradiation to study the mechanism of the Cr depletion fundamentally. In this study, the availability of a high-voltage electron microscope (HVEM) and a transmission electron microscope with a field emission gun and an energy dispersive X-ray analyser (FEG-TEM/EDX) combination, is discussed as one of the simulation techniques for the radiation-induced segregation near GB due to the neutron irradiation under a boiling water reactor core environment. For the discussion, we investigated the effect of Ti and Nb addition on suppression of the Cr depletion in the temperatures of 523–673 K. Radiation-induced segregation (RIS) occurs in SUS316L irradiated with electrons at 523 K, and behaviour of the solute segregation obtained from the electron irradiation simulates RIS under neutron irradiation at 561 K. The tendency of the Cr depletion under the electron irradiation of 523–573 K, is similar to that from the neutron irradiation for the materials containing small amounts of Ti and Nb. It is confirmed that the combination of HVEM and FEG-TEM/EDX is one of the appropriate simulation techniques for the studies of radiation-induced segregation near GB.

Keywords     austenitic stainless steel, electron irradiation, HVEM, radiation induced Cr depletion at grain boundaries, FEG-TEM, Nb and Ti containing alloy

Received     30 November 1998, accepted 27 April 1999


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