ブレーズ法による高クロム鋳鉄と鋼の接合過程

概要

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To clarify the bonding process of copper-brazed high chromium cast iron and mild steel, specimens were water-quenched during bonding, and bonded structure, distribution of alloys in bonded zone and quantitative analysis of base materials dissolved into molten copper were investigated. Both base materials begin to dissolve first into molten copper when bonding temperature rises up over the melting point of copper and the dissolution continues up to the solubility of solute atoms dissolved. Soon, the molten copper and γ phase come to a state of equilibrium at the interfaces of both base materials and copper. Since chemical potential of iron in the molten copper at cast iron side is lower than that at steel side, however, iron diffuses from the steel through molten copper to cast iron. In molten copper near cast iron, therefore, concentration of iron increases and constitutional supercooling occurs, and Fe-Cu-Cr-C alloy crystallizes in a rod-like shape. Once the alloy precipitates, iron concentration in the copper around it decreases. To make up for the shortage of iron, more dissolution of the steel takes place, and consequently the alloys continue to develop toward the steel.
Japan Foundry Engineering Societyの論文