溶接学会論文集
Online ISSN : 2434-8252
Print ISSN : 0288-4771
In-situ observation of phase transformation during rapid cooling processes
YAMADA TomonoriYONEMOTO YukihiroYAMASHITA SusumuMURAMATSU ToshiharuKOMIZO Yu-ichi
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2011 年 29 巻 3 号 p. 86s-89s

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Inclusions contributing to acicular ferrite nucleation were investigated from a crystallographic point of view to understand the formation mechanism for acicular ferrite microstructure in low alloy steel laser weld metals. The sample was low carbon Ti-B weld metals with an oxygen content of 480 ppm. In this sample, intragranular acicular ferrite formation was observed from some inclusions and acicular ferrite had Kurdjumov-Sachs orientation relationship with austenite matrix. The multi-phase inclusions contributed to nucleation of acicular ferrite. They were surrounded by a Ti-enriched layer. It was confirmed by selected area diffraction and EDS analysis that the Ti-enriched layer was TiO. The acicular ferrite had Baker-Nutting orientation relationship with TiO layer on the inclusion surface. The lattice misfit was 3.0 % at the interface between the acicular ferrite and TiO.
Therefore, it is considered that the TiO on the inclusion surface contributes to the heterogeneous nucleation of acicular ferrite by small lattice misfit.

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© 2011 by JAPAN WELDING SOCIETY
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