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Solidification cracking is a critical defect in welding, and its occurrence has conventionally been described using temperature-dependent critical-strain curves. However, whether the critical strain is uniquely determined by temperature remains unclear, particularly at the dendrite scale. In this study, solidification-cracking behavior in an Fe–15Mn–10Cr–8Ni–4Si alloy was investigated using in-situ synchrotron X-ray transmission imaging combined with local strain and temperature analyses. Crack-initiation events were identified from the time-resolved X-ray images, and the corresponding critical equivalent strains and critical temperatures were extracted at individual positions along the crack path. Solidification cracking occurred over approximately 1320–1000 °C, corresponding to the effective solid–liquid coexistence region predicted by a Scheil–Gulliver calculation. The median critical strain was higher at lower temperatures and generally decreased toward higher temperatures. A broad critical-strain distribution remained within each 30 °C temperature range. After subtraction of the temperature-bin median, the remaining variation was spatially nonuniform along the crack path. Comparison with a non-cracking case showed that most equivalent-strain values remained below the critical-strain distribution obtained in the cracking case, although the upper tail partially overlapped its lower part. These results provide experimental evidence that the critical strain at solidification-crack initiation is better represented as a temperature-dependent distribution than as a single-valued curve. The physical factors governing the distribution width and spatial variation remain to be identified.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Solidification cracking, in-situ synchrotron X-ray imaging, dendrite-scale observation, critical equivalent strain, critical-strain distribution, welding

刊行年月日: 2026-12-31

出版者: Informa UK Limited

掲載誌:

• Science and Technology of Advanced Materials (ISSN: 14686996) vol. 27 issue. 1 2736326

研究助成金:

• Japanese Society for the Promotion of Science JP24K01220 and JP23H01731

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1080/14686996.2026.2736326

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更新時刻: 2026-10-28 16:50:19 +0900

MDRでの公開時刻: 2026-10-29 10:32:27 +0900