Precipitation Behaviors of Cementite in Fe-0.8 mass%C-0.1 mass%B Alloy

Yamashita Takako, Matsuzaki Akihiro, Takajo Shigeaki, Hasebe Mitsuhiro

doi:10.2320/jinstmet1952.63.6_708

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Fe-0.8 mass%C-0.1 mass%B合金におけるセメンタイトの析出挙動
Fe-0.8 massパーセントC-0.1massパーセントB ゴウキンニオケルセメンタイトノセキシュツキョドウ

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The microstructure and precipitation behavior of cementite in Fe-0.8 mass%C-0.1 mass%B alloy were investigated to reveal the influence of B on the precipitation behavior of cementite.<BR>Two types of coarse cementite were observed in the specimen heated at (γ+cementite) equilibrium temperature of 1100°C. The one was Fe₃(C_0.33B_0.67) that precipitated from the liquid phase enriched with B through the partitioning of solutions during solidification. The other was Fe₃C that precipitated from the early liquid phase.<BR>The composition of Fe₃(C_0.33B_0.67) remained unchanged even after the subsequent heat treatment due to its high thermodynamic stability. The Fe₃(C_0.33B_0.67) precipitate was effective as a nucleation site of cementite in the (α+cementite) equilibrium region because Fe₃(C_0.33B_0.67) provided a cementite nucleus with B and thermodynamically enhanced its nucleation. The cementite nucleated on the coarse Fe₃(C_0.33B_0.67) precipitate abnormally coarsened due to its size effect.

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Journal of the Japan Institute of Metals and Materials

Journal of the Japan Institute of Metals and Materials 63 (6), 708-716, 1999

The Japan Institute of Metals and Materials

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