Reaction between Fe-C Binary Alloys and Liquid Zinc

概要

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Twenty binary Fe-C alloys with a full-annealed structure were immersed in a pure zinc bath at 733 K for 600 s to clarify the reactivity of pearlite structure with liquid zinc. The structure of an alloy layer formed was observed and its thickness and the quantities of iron reacted with zinc were measured. The results obtained are as follows: (1) The alloy layer formed on a steel containing carbon up to a eutectoid level consists of a gamma layer next to the steel base, followed by a delta 1 layer and a zeta layer, and many ternary carbide particles are found in the alloy layer, increasing in number in propotion as a carbon concentration increases. Many cementite projections are found at an alloy layer / steel base interface, and the zeta layer grows irregularly in a hyper-eutectoid carbon level. (2) The thickness of the alloy layer and the quantities of iron having reacted with zinc do not depend on the carbon concentration up to the eutectoid level. (3) Cementite disrupts into the ternary carbide particles, and these particles are placed on the straight or curved line, or are distributed sparsely, depending on the cementite size and its relative position to the alloy layer/steel base interface. (4) The reactivity of pearlite structure is comparable with that of ferrite structure in 733 K, 600 s immersion.
長崎大学工学部,Faculty of Engineering, Nagasaki Universityの論文