Study on oxide dispersion strengthened ferritic steels for FBR fuel cladding materials(III A)

Fujiwara, Masayuki*; Nishida, Toshio*; Soshiroda, Tetsuo*; *

PNC TJ9058 88-007, 189 Pages, 1988/08

PNC-TJ9058-88-007.pdf:35.57MB

As the Oxide Dispersion Strengthened (ODS) ferritic steels have excellent resistance to swelling as well as superior strength at elevated temperatures, they are expected for the long life fuel claddings of the large scale FBR's. To evaluate the applicability of the ODS ferritic steels for the fuel claddings, we investigated the effects of the manufacturing conditions, the additional elements (Nb, V, Zr), the combined strengthening of solutin (W,Mo) and dispersion hardenings, and the kinds of the oxide particles (YO, ZrO) on the properties, especially the elevated - temperature strength, of the ODS ferritic steels. (1)The conditions of the mechanical alloying(MA) process using the attritor showed the strong effect on the properties of the ODS steels. The higher energy the alloy powders are given, the better dispersion of the oxide particles is obtained. The higher agitater speed of the attritor is thought to be the most efficient condition among the MA conditions. (2)The mixed oxied were formed in the Nb and Zr added steels, but in the V added steel the formation of the mixed oxides was not observed. The additions of Nb and V raised the elevated - temperature strength, while the addition of Zr showed little effect on the strength. (3)The additions of the solution hardening elements, Mo and W, up to about 2% increased the creep rupture strength. The effect of W was larger than that of Mo. (4)We chose ZrO instead of YO, and studied the effect of ZrO dispersion on the elevated - temperature strength of the ODS ferritic steels. Although the effect of ZrO on the strength is rather smaller than that of YO, the dispersion strengthening by ZrO particles was observed.

Current status of extreme environment single crystal neutron diffractometer SENJU, and latest news from JRR-3

Kaneko, Koji; Ohara, Takashi; Kiyanagi, Ryoji; Kawasaki, Takuro; Oikawa, Kenichi; Tamura, Itaru; Yamauchi, Yasuhiro; Hanashima, Takayasu*; Moyoshi, Taketo*; Nakao, Akiko*; et al.

no journal, , 

Condition of the experimental device in JRR-3

Shimojo, Yutaka; Sakata, Mami; Hayashi, Kazuhiko; Kawana, Daichi*; Asami, Toshio*; Sugiura, Ryosuke*; Okawara, Manabu*

no journal, , 

no abstracts in English