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Yamada, Tomonori; Yonemoto, Yukihiro; Yamashita, Susumu; Muramatsu, Toshiharu; Komizo, Yuichi*
Yosetsu Gakkai Rombunshu (Internet), 29(3), p.86s - 89s, 2011/08
It is known that residual stress is important to keep the structural integrity. Laser welding is effective for the residual stress decrease because heat input is smaller and heats have a very small effect. Therefore, the repairing technology by laser welding has draw wide attention for a life extension of FBRs (Fast Breeder Reactors). To establish the laser repair technology, special attentions should be paid to the morphological developments. In the present work, morphological developments were directly observed using laser scanning conforcal microscopy during laser weld cooling.
; Yoshikawa, Hiroshi; ; ; Hori, Toshihiko*; Ito, Yuichi*; Yokomizo, Hideaki
Japanese Journal of Applied Physics, 35(10), p.5530 - 5538, 1996/10
Times Cited Count：3 Percentile：20.96(Physics, Applied)no abstracts in English
; ; Ito, Yuichi*; Yoshikawa, Hiroshi; ; *; Yokomizo, Hideaki
AECL-10728 (Vol. 2), p.665 - 667, 1992/00
no abstracts in English
Zhang, S.; Morito, Shigekazu*; Komizo, Yuichi*
no journal, ,
Yamada, Tomonori; Shobu, Takahisa; Yada, Hiroki; Muramatsu, Toshiharu; Komizo, Yuichi*
no journal, ,
no abstracts in English
Yamada, Tomonori; Shobu, Takahisa; Yamashita, Susumu; Nishimura, Akihiko; Muramatsu, Toshiharu; Komizo, Yuichi*
no journal, ,
Residual stresses caused by welding processes are very important to keep structural health. The stresses depend heavily on the weld thermal history. Thus, we have studied mainly the hydrodynamic which affect the temperature distribution during a welding process. In this present work, we have carried out in-situ X-ray transmission imaging of a few metallic sample during laser welding. Hydrodynamics in a molten aluminum pool was observed using an intense synchrotron radiation source with tracer particles. In the laser intensity of 33 kW/cm
, steady flow which consisted of downward flow and upward flow was observed in the molten pool. The Maximum flow velocities were about 19.5 mm/s. The simultaneous observation of molten pool shape and flow velocity enabled the evaluation of convective heat transport. Estimated heat quantity caused by the convective heat transport is almost the same or more than that of heat conduction which is supported by the simulation.
Zhang, S.; Terasaki, Hidenori*; Komizo, Yuichi*
no journal, ,
In weld metal, it is important to decrease the residual stress of the welded joints because residual stress generated by welding promotes brittle fracture, stress corrosion cracking. As one of a countermeasure to use a volume expansion of martensitic transformation during low temperature transformation (LTT) has been examined. Then to establish this examination, the interplay between a solid state transformation and a stress deformation is very important. In this colloquium, we will present in-situ observation of the relationship between the stress deformation and the martensitic transformation of LTT, by using synchrotron radiation X-rays.
Yamada, Tomonori; Terada, Takaya; Zhang, S.; Shobu, Takahisa; Nishimura, Akihiko; Muramatsu, Toshiharu; Komizo, Yuichi*
no journal, ,
no abstracts in English
