由低温下的溶解度导出氮在α-Fe中的活度数据,求得了Fe-C-N三元系中各二元交互作用系数,并导出了该系中的分配方程组.依此在PDP-11/23计算机上计算了γ′及ε单相区界域.计算结果表明:原Naumann和Langenscheid相图中的γ′相区正确,但ε相区需修正.计算结果与Wells及Bell的大部分实验结果符合.采用石墨为标准态(见附录证明)的计算也得到相同结论.
The activity of N in α-Fe was derived from the solubility data at580℃ in the Fe-N diagram. The interaction coefficients of Fe-N, Fe-C and C-Nwere obtained and the phase boundaries of single-phase ε-and γ_1-fields were subse-quently calculated. The results show that the γ_1-region of Naumann and LangescheidFe-C-N ternary phase diagram is correct, but the ε-region requires revision. Calcu-lation give an evidence that most of the experimental data on the ε-phase report-ed by Wells and Bell appears reasonable. Calculations taking graphite as a standaredstate confirms the above conclusions.
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