Materials Transactions Online

Materials Transactions, Vol.47 No.01 (2006) pp.239-242
© 2006 The Japan Institute of Metals

Friction Stir Welding of Ultrafine Grained Interstitial Free Steels

Hidetoshi Fujii1, Rintaro Ueji2, Yutaka Takada1, Hiromoto Kitahara3, Nobuhiro Tsuji3, Kazuhiro Nakata1 and Kiyoshi Nogi1

1Joining and Welding Research Institute, Osaka University, Ibaraki 567-0047, Japan
2Department of Advanced Materials Science, Kagawa University, Takamatsu 761-0396, Japan
3Department of Adaptive Machine Systems, Osaka University, Suita 565-0871, Japan

Friction stir welding (FSW) was applied to ultra low-carbon interstitial free steels with mean grain sizes ranging from 0.7 μm, prepared by accumulative roll-bonding, to 27 μm. The steel with the intermediate grain size (1.8 μm) is most preferable for obtaining the highest hardness in the stir zone with the smallest grain size.

(Received 2005/11/14; Accepted 2005/11/28; Published 2006/1/15)

Keywords: friction stir welding, accumulative roll bonding, steel, ultrafine grained microstructure

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