共焦点型レーザー顕微鏡の材料工学への応用

概要

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Direct observation of high temperature behavior of materials is difficult due to intensive radiation from the sample. Modification of recently developed conforcal laser scanning microscope (∿×2,100) installed above an infrared image furnace, capable of operating up to 1923K, has made it possible to directly monitor the phase transformation, crystal growth and motion of inclusions at high temperature. Low carbon (LC : C 0.038,S 0.01 and Mn 0.2 mass%) and high carbon (HC : C 0.83,S 0.001 and Mn 0.48mass%) steel were contained in an alumina crucible and heated in the infrared image furnace under pure Ar to melting. On heating, transformation for HC and transformation for LC were clearly observed. Collision and agglomeration of Al_2O_3 inclusions on steel melt were also observed in-situ. On cooling, the dendritic crystal growth in the steel melt was identified. These observations demonstrate the usefulness of this technique to investigate the dynamics of materials at high temperature.laser scanning microscopesteelphase transformationcrystal growthinclusionagglomeration
東北大学の論文