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| STUDY ON γ/γ+NbC_x PHASE BOUNDARY IN Fe-Nb-C SYSTEM |
| HONG Yanruo(Y.R.Hong);Professor;Gruduate School; Beijing University of Iron and Steel Technology |
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Cite this article:
HONG Yanruo(Y.R.Hong);Professor;Gruduate School; Beijing University of Iron and Steel Technology. STUDY ON γ/γ+NbC_x PHASE BOUNDARY IN Fe-Nb-C SYSTEM. Acta Metall Sin, 1988, 24(1): 114-118.
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Abstract The thermodynamic properties of nonstoichoimetric niobium mono-carbide (NbC_x) have been investigated by a, galvanic cell technique using calciastabilized zirconia(CSZ) and yttria stabilized zirconia(YSZ) solid electrolytes. EMFmeasurements were made in the temperature range 1100--1360K for compositionsvarying from NbC_(0.72) to NbC_(0.98) and activity relationships and partial molar freeenthalpies for Nb and C and integral molar free enthalpies for NbC_x have beencalculated from the results. The Fe-Nb-C system was assumed to be a regular solutionand the equation for evaluating γ/γ+NbC_x phase boundary in the Fe-Nb-C systemwas evaluated by using the integral molar free enthalpy of NbC_x determined bythis work lnN_(Nb)-N_(Nb)[13990+29390x-29390(1+x)N_c]/T+xlnN_c+ +[(1+x)6995N_(Nb)~2]/T-5284x/T+(13900+A)/T-B/8.314- -N_c[29390-10570x+5284(1+x)N_c]/T=0 When substituted 0.98, 0.945, 0.91 and 0.87 for x in the equation, the calcu-lated results were in excellent agreement with the results determined by Meyer, Chris-tensen, Nordberg, Johanson and SHENG Lizhen, Mori, respectively. The cause ofthe differences amony former data was also shown in present paper.
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Received: 18 January 1988
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1 Meyer L. Dissertation Claustthal Berg, Hottn, 1966
2 Christensen N, Johansen T H. Progress Report Submitted to the Royal Norwegian Council For Scientific and Industrial Research, Jan 31, 1966
3 Nordberg H, Aronsson B. J Iron Steel, Inst, London, 1968; 206: 1236
4 Johansen T H, Christensen N, Augland B. Trans AIME, 1967; 239: 1651
5 盛利贞,时実正治,山口(纟厶),角南英八郎,中嶋由行。铁钢,1968;54:763
6 Huber E J Jr., Head E L, Holley C E Jr., et al., J Phys Chem, 1961; 65: 1846
7 Elliott J F, Rodney P. Trans ASM, 1961; 53: 13
8 Smith A, Mass W. Z Anorg Chem, 1894; 7: 96
9 Brauer G, Renner H, Wernet J. Z Anorg Chem, 1954; 277: 249
10 Honeycombe R W K. Scand J Metall, 1979; 8: 21
11 Harvig H. Jernkontorets Ann, 1971; 155: 157
12 #12
13 #12
14 Robinson D, Argent B B. J Mater Sci, 1975; 10: 217
15 Argent B B, Wakeman D W. N P L Symposium No9 On Intermetallic Compounds, 1958; (1) : 3
16 Hudd R C, Jones A, Kale M N. J Iron Steel Inst, London, 1971; 209: 121
17 #12
18 #12
19 Laskhamanan V K. M Eng Thesis, McMaster University, Ontario, Canada, 197 |
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