レーザ急冷凝固処理部における棒状共晶凝固組織の生成機構 : ステンレス鋼のレーザ表面改質に関する研究(第2報)

概要

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Three kinds of Fe-Cr-Ni ternary alloys were surface-melted by a CO_2 laser and effects of rapid solidification on solidification modes and microstructures were investigated. It was found that characteristic rod-like eutectic structure formed in these alloys rapidly solidified by laser surface melting which could not be seen in conventional TIG weld metals. The rod-like eutectic structure almost formed in the limited compositional range with iron content of more than 57% in which primary ferrite solidification occurred in conventional TIG weld metals. It was also seen that the formation tendency of the rod- like eutectic structure first increased and then decreased with increasing laser traveling velocity. Austenite in the rod-like eutectic structure was a rod-like in shape and orientation relationship of <100>δ//<100>γ was confirmed between austenite and ferrite. STEM analysis revealed that element distributuin across austenite and ferrite was not so largely changed in the rod-like eutectic structure comparing with that in vermicular ferrite structure in the TIG weld metal.
社団法人溶接学会の論文
1990-08-05