Dynamic Observation of Solidification and Solidification Cracking during Welding with Optical Microscope (I) : Solidification Front and Behavior of Cracking(Materials, Metallurgy & Weldability)

概要

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Dynamic behaviors of solidification front and solidification cracking during welding of different steels have been observed with high speed cinecamera mounted on optical microscope. The dynamic observation of the solidification front has revealed very narrow apparent solidification temperature range compared with true solidification temperature range. The dynamic observation of the solidification cracking in rapid tensile test has revealed that crack initiation occurs at high temperature part in true solidification temperature range and that the crack propagates toward both higher and lower temperature regions. These observations have been well explained from the viewpoint of solidification theory. Moreover, a new concept of solidification cracking has been proposed on the basis of these observations.
大阪大学の論文