ブレーズ法による高クロム鋳鉄と鋼の接合性に及ぼす鋼中合金元素の影響

概要

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A 26 % Cr eutectic cast iron and steels varying chromium, nickel or carbon content independently were copper brazed under a bonding condition of 1383 K × 0.6 ks, and the effects of alloying elements on the microstructure of bonded zone and the bond-strength were clarified. Length (LA) of rod-like crystals which precipitate at cast iron side of bonded zone and width (WB) of the bonded zone increase with an increase in chromium content, and which leads to larger bond-strength (τB). Nickel delays both precipitation of the rod-like crystals and growth of bonded zone, but the τB increases. The LA and the WB decrease and the τB lowers as carbon content increases. When carbon increases over a critical content, the rod-like crystals crystallize at the steel side and the LA and the WB also become larger. Since chromium, nickel and carbon change the chemical potential of the iron in steel as well as in molten copper adjacent to the steel, the bonding process is resultantly influenced by these alloying elements.
Japan Foundry Engineering Societyの論文