Phase Diagram and Solidification Structure in Fe-15%Cr-C-B Alloys

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  • Aso Setsuo
    Department of Materials Engineering and Applied Chemistry, Mining College, Akita University
  • Tagami Michihiro
    Department of Materials Engineering and Applied Chemistry, Mining College, Akita University
  • Goto Shoji
    Department of Materials Engineering and Applied Chemistry, Mining College, Akita University

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  • Fe-15%Cr-C-B 4元系合金の状態図と凝固組織
  • Fe 15パーセント Cr C B 4ゲンケイ ゴウキン ノ ジョウタイズ ト

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Abstract

Five kinds of phases were detected in the liquidus phase diagram of the Fe-15%Cr-C-B alloy system. Two types of peritectic reactions {L+M2B→M3(C, B) and L+M7(C, B)3→M3(C, B)} and four types of eutectic reactions {L→γ+M2B, L→γ+M3(C, B), L→γ+M23(C, B)6, L→γ+M7(C, B)3} were also detected on each liquidus phase boundary. The sum of carbon and boron concentrations in each boro-carbide was almost constant; that is, the sum was about 5.5% in M3(C, B), about 4.7% in M23(C, B)6 and about 7.5% in M7(C, B)3; however, the carbon and boron concentrations in each boro-carbide changed compensatory in these constant concentrations. In the M2B liquidus phase region, two types of boride were detected: one was a columnar boride with high boron content, which was identified as a M2B type boride, the other was a plate-like boride with low boron content, which was still unknown in this investigation. The conjugate relations of γ phase and the compound phase were in good agreement with the solidification structures.

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