極低炭素 Ti 系合金化溶融亜鉛めっき鋼板の合金化挙動に及ぼす鋼中 P 濃度の影響

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An investigation was made on the effects of the P content on Г phase growth during the process of galvannealing ultra-low-carbon-0.05%-Ti-steel sheet. The results showed that a P content of equal or more than 0.025% tends to suppress the growth of the Г phase. With a low P content (0.005%), during the galvanizing process, a relatively small Al concentration is detectable at the interface between the Zn coating layer and the steel substrate and this accelerates the formation of the outburst structure. With a high P content (0.052%) in which more P is concentrated at the steel surface, the Al concentration in the interface is large. This results in the formation of an Fe-Al alloy layer having a stronger burrier effect of difusion and the outburst structure is significantly suppressed. During the galvannealing of low-P steel, the Г phase begins to grow after the ζ and δ_1 phases have developed to some extent. This is because the δ_1 phase, constituting mainly the outburst structure, directly contacts the substrate from the stage of the galvanizing process. Thereafter, the iron content of the δ_1 phase rises, accelerating the formation of the Г phase. With high-P steel, in contrast, the galvannealing process progresses through the Fe-Al alloy layer, since no direct contact occurs between the δ_1 phase and the substrate. The Г phase starts to grow only after the ζ phase disappears, which means the Г phase growth is delayed.
社団法人日本鉄鋼協会の論文
1994-07-01

極低炭素 Ti 系合金化溶融亜鉛めっき鋼板の合金化挙動に及ぼす鋼中 P 濃度の影響

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