金属学报  1987, Vol. 23 Issue (1): 33-41

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Fe-C合金贝氏体相变热力学(LFG 模型)

徐祖耀;牟翊文

上海交通大学;上海交通大学

THERMODYNAMICS OF BAINITIC TRANSFORMATION IN Fe-C ALLOYS(LFG MODEL)

XU Zuyao (T.Y.Hsu)MOU Yiwen (Shanghai Jiaotong University)

徐祖耀;牟翊文. Fe-C合金贝氏体相变热力学(LFG 模型)[J]. 金属学报, 1987, 23(1): 33-41.
, . THERMODYNAMICS OF BAINITIC TRANSFORMATION IN Fe-C ALLOYS(LFG MODEL)[J]. Acta Metall Sin, 1987, 23(1): 33-41.

摘要 参考文献 相关文章 Metrics 全文: PDF(665 KB)   摘要: 由 LFG 模型计算贝氏体相变三种可能过程的相变驱动力和 KRC 的结果基本相近,但在高碳合金显示差别.认为对处理间隙固溶体,LFG 模型似略胜一筹.但两个模型所得均以ΔG~(γ→a+Fe_3C)为最大,ΔG~(γ→a+γ_1)次之,ΔG~(γ→a′)最小,ΔG_N~(γ→a′)更远远低于ΔG_N~(γ→a+γ_1)。在 Bs(或 Bs 附近)温度,对 x_γ=0.01—0.02;LFG 的ΔG~(γ→a+γ_1)为-190—-237Jmol~(-1);对 x_γ=0.0235合金,LFG 的ΔG~(γ→a′)和ΔG~(a′→a″+Fe_3C)之和仅-181Jmol~(-1).本文再次表明,按热力学,至少在上部温度,贝氏体不可能以切变机制形成.由形核(长大)驱动力的计算证明,亚共析钢共析反应的领先相为铁素体,而过共析钢的领先相为渗碳体. Abstract：The calculated results obtained from the refined LFG model is similar to that from KRC,but there exists divergency between them in alloys with higher C contents.It seems that for treating interstitial solid solution,LFG model is more suitable over the KRC.Both the results from the two models show that △G~(γ→α+Fe_3c) is the largest,followed by △G~(γ→α+γ_1) and △G~(α-γ′) is the smallest and △G_N~(γ→α′)is far less than △G_N~(γ→α+γ_1′).At B_s,from LFG,for x_γ=0.001-0.002,△G_N~(γ→α+γ_1)△G_N~(γ→α+γ_1)- -196--237 J.mol~(-1);for x_γ=0.035,the sum of △G~(γ→α′) and △G~(α′→α″+Fe_3)is only—181 J.mol~(-1).The present work verifies again that at least at upper tem- perature range,the formation of bainite with shear mechanism is thermodynam- ically impossible.Calculation of the driving force for nucleaction(growth)gives an evidencs that the leading phase of the eutectoid reaction in hypoeutectoid steels is ferrite while that in hypereutectoid steels is cementite. 收稿日期: 1987-01-18      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 徐祖耀 牟翊文 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1987/V23/I1/33 1 Hsu TY(Xu Zuyao),Mou Yiwen.In:Marder AR,Goldstein J I,eds.Proc,on Phase Transformations in Ferrous Alloys,TMS-AIME,1984,327 2 Hsu TY(Xu Zuyao),Mou Yiwen.Acta Metall,1984;32:1469 3 徐祖耀,牟翊文,金属学报,1985;21:A102 4 Mou Yiwen,Hsu T Y(Xu Zuyao).Acta Metall,1986;34:325 5 Fowler R H.Proc Cambridge Phil Soc,1936;32:144 6 Lacher J R.Proc Cambridge Phil Soc,1937;33:518 7 Fowler R H,Guggenheim E A.In:Statistical Thermodynamics.Cambridge University Press,1956,426-442． 8 Aaronson H I,Domain H A,Pound G M.Trans Metall Soc AIME,1966;236:753 9 Shiflet G J,Bradley J.R,Aaronson H I.Metall Trans,1978;9A:999 10 Bhadeshia H K D H.Met Sci,1981;15:178 11 Bhadeshia H K D H.Acta Metall,1980;28:1103 12 Hsu TY(Xu Zuyao),Chang Hongbing.Acta Metall,1984;32:343 13 Kaufman L,Clougherty E V,Weiss R J.Acta Metall,1963;11:323 14 Orr R L,Chipman J.Trans Metall Soc AIME,1967;239:630 15 1972;109-113 16 Kanfman L,Radcliffe S V,Cohen M.In:Zackey V F,Aaronson H I,edso,New York:Interscience,1962;313 17 徐祖耀,马氏体相变与马氏体,科学出版社,1980,258 18 徐祖耀,金属材料热力学,科学出版社,1980;279 19 Hsu T Y(Xu Zuyao).J Mater Sci,1985;20:23 20 Steven W,Haynes A G.J Iorn Steel Inst,1956;183:349[ No related articles found! Viewed Full text Abstract Cited   Shared      Discussed