溶融亜鉛めつきの合金相形成におよぼす下地鋼板の組織と成分の影響
1986 年 72 巻 8 号 p. 989-996
詳細
1986 年 72 巻 8 号 p. 989-996
The effects of surface microstructure and chemical compositions of steels on characteristics of Fe-Zn intermetallic phases formed on continuously galvanized steel sheets have been investigated, using ultra low carbon and low carbon steels.
From a SEM observation, the morphology of Fe-Zn IMP formed at interface between steel and plating layer were classified into three types ; outburst structure, fine granular structure, and pillar-like structure. The formation of the outburst structure was accelerated by decreasing solute carbon content in steels. Phosphorus inhibited this formation when solute carbon was combined with a carbide forming element such as Nb or Ti. The comparison between distribution of Fe-Zn IMP and corresponding steel surface indicated that the outburst structure was given priority to form at the grain boundaries exposed on the steel surface, whereas fine granular structure formed mainly at the surface grain interior.
