鋳鉄による鋼管の鋳ぐるみにおける接合過程と溶射の効果の解析

概要

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In cast-in insert, thermal spraying with Ni base self-fluxing alloy improves the bonding state markedly. In this report, mild steel and stainless steel pipes were bonded to gray iron, and the solidification progress at the bonding interface was analyzed by a finite difference method to clarify the bonding process and the role of spraying. Diffusion of Ni was also calculated and compared with the measurements and the microstructures. The analysis showed that the solidification at the interface progresses in three ways, depending on the volume ratio of the insert and the melt : by gradual solidification, rapid solidification followed by remelting, and rapid solidification without remelting. Good bonding is possible with the two former, where the fused sprayed alloy between the steel and the solid liquid coexisting cast iron expands the critical region of solid fraction and contact period required for the good bonding. Agreement between calculated and measured Ni diffusion and the microstructures supported these bonding processes.
日本鋳造工学会の論文