合金化溶融亜鉛めっき鋼板における Fe-Zn 合金相の析出・成長挙動に及ぼす鋼中 P の影響

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The formation and growth of the iron-zinc compound phases, especially Γ_1-Fe_5Zn_<21> and Γ-Fe_3Zn_<10>, at 773K in galvannealed coatings on the titanium-stabilized interstitial free (IF) steel and the interstitial-free rephosphorized (IFP) steel have been investigated by means of the cross-sectional SEM observation. The formation order of Γ_1 phase and Γ phase was different between the substrates ; on the IFP steel substrate, the formation of Γ phase was retarded, which resulted in the prior formation of Γ_1 phase. The formation and growth of Γ_1 phase, on which little influence of phosphorus in steel was observed, is considered to be controlled by the diffusion of iron atoms across the Γ_1/δ_1 interface, which is controlled by the diffusion-coefficient change and the iron-concentration gradient of δ_1 phase. The reaction-rate analysis reveals that Γ phase on the IF steel substrate grows by moving the Γ/substrate interface toward the substrate by the diffusion of zinc atoms from the coating into the substrate and that early formation and rapid growth in the earlier stages of alloying reaction are caused by moving Γ/Γ_1 interface toward the Γ_1 phase by the diffusion of iron atoms from the substrate to the coating. Both formation and growth of Γ phase on the IFP steel substrate were retarded, comparing to those on the IF steel substrate, which suggest that both solid-soluted and grain-boundary segregated phosphorus in the IFP substrate interferes the zinc diffusion from the coating into the substrate.
社団法人日本鉄鋼協会の論文
1997-11-01

合金化溶融亜鉛めっき鋼板における Fe-Zn 合金相の析出・成長挙動に及ぼす鋼中 P の影響

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