|
|
|
| A THERMODYNAMIC STUDY OF THE Fe-C SYSTEM Ⅲ.THE METASTABLE IRON-CEMENTITE EQUILIBRIUM |
| CHOU YUAN-HSI Institute of Metallurgy and Ceramics;Academia Sinica |
|
Cite this article:
CHOU YUAN-HSI Institute of Metallurgy and Ceramics;Academia Sinica. A THERMODYNAMIC STUDY OF THE Fe-C SYSTEM Ⅲ.THE METASTABLE IRON-CEMENTITE EQUILIBRIUM. Acta Metall Sin, 1956, 1(3): 221-232.
|
|
|
Abstract Concluding this series on thermodynamic study of the Fe-C system,the presentpaper deals with an analysis of the metastable iron-cementite equilibrium on thebasis of the activity data derived previously by the author and the free energy ofcementite recalculated by the author in this paper.It has not been possible before to calculate the cementite eutectic temperaturedue to lack of data on activities in the liquid iron-carbon system.With the aid of the results of calculation in a previous paper,this temperature has been found tobe 1148°,or 5° below the graphite eutectic temperature.The cementite eutectoidtemperature 723°,determined by Mehl and Wells,is found to be consistent withthermodynamic requirements.Darken and Gurry chose 1146° as the cementite eutectic temperature andwith this value and certain other data calculated the free energy of cementite as afunction of temperature.On the basis of the more rigorously calculated cementiteeutectic temperature 1148° and the carefully determined cementite eutectoid tempe-rature 723° and certain other data,the free energy of cementite has been recal-culated by the author and found to be considerably different from Darken andGurry's results.The solubilities of cementite in austenite and in liquid iron respectively arethen calculated as functions of temperature.It should be pointed out,however,thatthe solubility of cementite in liquid iron thus calculated is only a first approximationand will certainly be revised in the future when more data on the free energy ofcementite at higher temperatures become available.A complete Fe-C equilibrium diagram including both stable and metastableequilibria has been constructed in the light of the results of this and a previouspaper.It is easily seen that certain important differences exist between the conven-tional and the revised diagrams.
|
|
Received: 18 March 1956
|
[1] 邹元爔,金属学报,1(1) ,1(1956) .
[2] Darken,L,S.and Gurry,R.W.,Trans.Am.Inst.Min.Met.Engrs.191,1015(1951) .
[3] 邹元爔,金属学报,1(2) ,209(1956) .
[4] Ruer,R.and Goerens,F.,Ferrum,14,161(1917) --文献[6] 内看到.
[5] Kase,T.,Sci.Repts.Tohoku Imp.Univ.,Series 1,19,11(1930) --文献[6] 内看到.
[6] Epstein,S.,The Alloys of Iron and Carbon,Vol.I,p.136--McGraw-Hill,New York(1936) .
[7] Darken,L.S.and Smith,R.P.,Ind.Eng.Chem.,43,1815(1951) .
[8] Umino,S.,Sci.Repts.Tohoku Imp.Univ.,Series 1,23,665(1835) --文献[2] 内看到.
[9] Seltz,H.,McDonald,H.J.and Wells,C.,Trans.Am.Inst.Min.Met.Engrs.,14,263(1940) .
[10] Browning,L.C.,Dewitt,T.W.and Emmett,P.H.,J.Am.Chem.Soc.,72,4211(1950) .
[11] Mehl,R.F.and Wells,C.,Trans.Am.Inst.Min.Met.Engrs.125,429(1937) .
[12] 渡濑武男,日本化学会会志,54,110(1933) .
[13] Rossini,F.D.et al.,U.S.Nat.Bureau of Standards Circular,461(1947) .
[14] Smith,R.P.,J.Am.Chem.Soc.,68,1163(1946) .
[15] Wert,C.A.,Trans.Am.Inst.Min.Met.Engrs.188,1242(1950) .
[16] Darken,L.S.and Gurry,R.W.,Physical Chemistry of Metals,p.401,McGraw-Hill,New York(1953) .
[17] Hillert,M.,Acta Metallurgica,2(1) ,11(1954) .
[18] Gurry,R.W.,Trans.Am.Inst.Min.Met.Engrs.150,147(1942) .
[19] Wells,C.,Trans.Am.Soc.Metals,26,289(1938) .
[20] Collette,G.and Jacque,L.,Comptes Rendus,236(9) ,1267(1953) .
[21] Hillert,M.,Acta Metallurgica,3(1) ,37(1955) .
[22] 文献[16] ,p.409-410． |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
