Tomoya Nagira
;
Houichi Kitano
;
Takashi Kimura
;
Fumiyoshi Yoshinaka
;
Susumu Takamori
;
Takahiro Sawaguchi
;
Takayuki Yamashita
;
Yasuhiro Aoki
;
Hidetoshi Fujii
コレクション
引用
説明:
(abstract)The dynamics of curved columnar growth and ripple formation in Fe-Mn-Cr-Ni-Si alloys were studied in situ during GTA melt-run welding using synchrotron radiation X-ray imaging with high spatial resolution. In situ observations demonstrated that primary dendrite arm growth ceased when the angle between the growth direction of the primary dendrite arms and the direction of the maximum temperature gradient exceeded 44–49 º at welding speeds of 1–7 mm/s. Consequently, curved columnar grains were formed by changing the growth direction via the development of secondary dendrite arms into primary dendrite arms. Image analysis revealed that a weld ripple, where solutes were highly segregated in the dendrite trunk, was formed by a rapid increase in the interface velocity.
権利情報:
-
In Copyright
© The Author(s) 2025.
キーワード: in situ observation, X-ray imaging, GTA welding
刊行年月日: 2025-08-04
出版者: SAGE Publications
掲載誌:
- Science and Technology of Welding and Joining (ISSN: 13621718) vol. 30 issue. 4 p. 296-304
研究助成金:
- Japan Society for the Promotion of Science 23H01731 and 24K01220
原稿種別: 著者最終稿 (Accepted manuscript)
MDR DOI: https://doi.org/10.48505/nims.5774
公開URL: https://doi.org/10.1177/13621718251360932
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更新時刻: 2025-09-22 16:30:19 +0900
MDRでの公開時刻: 2025-09-22 16:18:41 +0900