Ni-Cr-W-Mo 四元系におけるγ/(γ+α_2)/α_2 境界の実験的決定

概要

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To determine experimentally the solubility of a tungsten-rich bcc α_2 phase in a nickel-rich fcc γ phase in a Ni-Cr-W-Mo quaternary system, four Ni-Cr-W-Mo alloys with 0.03 wt pct carbon, whose compositions were in a γ+α_2 phase field, were equilibrated at 1000, 1100, 1200, and 1300℃ for 8000, 4500, 100, and 100h, respectively. Chemical compositions of the constituent phases were determined by means of electron microprobe analysis. Tie-lines between γ and α_2 phases and γ/(γ+α_2)/α_2 phase boundaries were constructed in four isothermal sections of the Ni-Cr-W-Mo quaternary equilibrium phase diagram. The solubility of α_2 in γ decreased with decreasing temperatures. Precipitation of carbides such as M_6C and M_<12>C at lower temperatures apparently lead to further decrease in the α_2 solubility.
社団法人日本鉄鋼協会の論文
1984-02-01