金属学报  1956, Vol. 1 Issue (2): 209-220

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铁碳系统的热力学研究——Ⅱ.铁碳相图稳定平衡部分的热力学分析

邹元爔

中国科学院冶金陶瓷研究所

A THERMODYNAMIC STUDY OF THE Fe-C SYSTEM Ⅱ.THE STABLE IRON-GRAPHITE EQUILIBRIUM

CHOU YUAN-HSI Institute of Metallurgy and Ceramics;Academia Sinica

邹元爔. 铁碳系统的热力学研究——Ⅱ.铁碳相图稳定平衡部分的热力学分析[J]. 金属学报, 1956, 1(2): 209-220.
. A THERMODYNAMIC STUDY OF THE Fe-C SYSTEM Ⅱ.THE STABLE IRON-GRAPHITE EQUILIBRIUM[J]. Acta Metall Sin, 1956, 1(2): 209-220.

摘要 参考文献 相关文章 Metrics 全文: PDF(841 KB)   摘要: 根据Smith测定及经作者修正的奥氏体内的活度及作者计算的液态铁碳合金内的活度与碳化铁的热力学函数以及其他必需的关于铁碳稳定平衡的实验及计算数据,作者对铁碳相图的稳定平衡部分作了较全面的分析。作者的计算包括:(i)石墨在铁素体內的溶解度;(ii)铁素体、奥氏体、石墨共析平衡;(iii)奥氏体、铁液、石墨共晶平衡;(iv)δ铁、奥氏体、铁液包晶平衡;(v)奥氏体、铁液二相区域的液相线及固相接。计算结果示于图3,此图与现行铁碳相图颇有不同之处。 Abstract：In the previous paper,activities in liquid Fe-C alloys have been evaluatedfrom low carbon concentrations up to saturation with reference to pure liquidiron and solid graphite respectively as the standard states using Richardson andDennis' data on dilute solutions of carbon in liquid iron as the chief basis of cal-culation.Moreover,Smith's data on equilibrium between austenite and gaseousmixtures(CO_2/CO,CH_4/H_2)have been retreated to yield activities in austenitewith reference to pure γ iron and graphite respectively as the standard states.The purpose of the present paper is to make a thermodynamic analysis of theiron-graphite equilibrium diagram on the basis of these activity data and certainother data including the free energy of cementite,the derivation of which will bediscussed in another paper of this series.Direct experimental data on the solubility of graphite in ferrite are not avai-lable.Darken and Gurry as well as Hillert calculated the solubility of graphitein ferrite from that of cementite in ferrite determined by a number of investi-gators and the free energy of cementite calculated by Darken and Smith.In the present paper,the solubility of graphite in ferrite has been recalculatedusing the free energy of cementite calculated by the author and the results arecompared with the values reported in the literature.Wells' data on iron-graphite eutectoid equilibrium have been found to beessentially compatible with thermodynamic requirements.The agreement betweenthe experimental and the calculated values can,however,be still improved if 735°instead of 738° is chosen as the eutectoid temperature.Regarding the iron-graphite eutectic,the condition for equilibrium demandsthat the activities of iron in austenite and an iron-carbon melt both saturatedwith graphite at the eutectic temperature should be equal if the same standard state is used.It has been found in the present paper that this condition can bebetter fulfilled if 10.83 cal./g.atom/deg.is chosen as the heat capacity of liquidiron and 3650 cal./g.atom as the heat of fusion of iron.From an analysis of the δ iron-austenite-liquid peritectic equilibrium,it hasbeen found that a peritectic temperature of 1495° and a liquid phase of 0.58%Care better than 1493° and 0.52%C reported by Adcock as well as 1499° and0.53%C calculated by Darken and Gurry.Finally,the liquidus and solidus curves of the austenite-liquid field have beencalculated,the latter being found to concave up slightly in contradiction withthe conventional Fe-C equilibrium diagram. 收稿日期: 1956-02-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 邹元爔 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1956/V1/I2/209 [1] 邹元燨,金属学报,1(1) ,1(1956) . [2] Smith,R.P.,J.Am.Chem.Soc.,68,1163(1946) . [3] 邹元燨,将在本刊发表. [4] Richardson,F.D.and Dennis,W.E.,Trans.Faraday Soc.,49(2) ,171(1953) . [5] Darken,L.S.and Gurry,R.W.,Physical Chemistry of Metals,p.401,New York(1953) . [6] Hillert,M.,Acta Metallurgica,2(1) ,11(1954) . [7] Darken,L.S.and Gurry,R.W.,Trans.Amer.Inst.Min.Met.Engrs.,191,1015(1951) . [8] Rossini,F.D.et.al.,U.S.Nat.Bur.of Standards Cir.461(1947) . [9] Wert,C.A.,Trans.Amer.Inst.Min.Met.Engrs,188,1242(1950) . [10] Wells,C.,Trans.Amer.Soc.Metals,26,289(1938) . [11] Darken,L.S.and Smith,R.P.,Ind.Eng.Chem.,43,1815(1951) . [12] Austin,J.B.,Ind.Eng.Chem.,24,1225(1932) . [13] Umino,S.,东北大学研究所报告(日本),23,665(1935) . [14] Wüst,Meuthen and Dutter,V.D.I.Forschungs arbeiten,204(1918) ,Z.Instrumentenk,39,294(1919) . [15] Oberhoffer and Grosse,Stahl u.Eisen,47,576(1927) . [16] Umino,S.,东北大学研究所报告(日本),15,331,597(1926) . [17] Umino,S.,东北大学研究所报告(日本),18,91(1929) . [18] Adcock,F.,J.Iron and Steel Inst.,135,281(1937) , [19] 文献[5] ,p.412． [20] 文献[5] ,p 413． No related articles found! Viewed Full text Abstract Cited   Shared      Discussed