通过高精度差分膨胀仪记录了Fe-4Cr合金在连续冷却过程中的线膨胀行为,获得其在不同冷速（75、150和330 K/min）下奥氏体→铁素体相变的相关动力学信息,并利用相变动力学模型解析式拟合了Fe-4Cr合金转变体积分数随温度变化的实验曲线。研究表明：冷却速度主要是通过改变晶界之间的位相角来影响动力学参数,即生长激活能QG和指前因子v0,从而影响奥氏体→铁素体相变动力学。
Expansion behavior of a Fe-4Cr alloy during austenite-territe phase transformation was studied by a differential dilatometer.Kinetics of austenite-ferrite phase transformation in Fe-4Cr alloy under different cooling rates（75,150,330 K/min） was investigated by fitting the calculated transformed fraction according to developed model based on the experimental data.The results show that cooling rates influence the process of grain growth mainly by changing the density of high angle boundaries which affect the active energy QG and pre-exponential factor v0.
参考文献
| [1] | Liu Y C;Sommer F;Mittemeijer E J .Abnormal austenite ferrite transformation behaviour in substitute Fe-base alloys[J].Acta Materialia,2003,51(02):507-513. |
| [2] | 宁保群,刘永长,高志眀,乔志霞,杨留栓.预冷淬火温度对T91铁素体耐热钢马氏体转变温度的影响[J].金属热处理,2007(09):33-35. |
| [3] | Mittemeijer E J .Analysis of the kinetics of phase transformations[J].Journal of Materials Science,1992,27:3977-3987. |
| [4] | Kempen ATW.;Sommer F.;Mittemeijer EJ. .Determination and interpretation of isothermal and non-isothermal transformation kinetics; the effective activation energies in terms of nucleation and growth[J].Journal of Materials Science,2002(7):1321-1332. |
| [5] | Liu F.;Sommer F.;Mittemeijer EJ. .An analytical model for isothermal and isochronal transformation kinetics[J].Journal of Materials Science,2004(5):1621-1634. |
| [6] | A. T. W. Kempen;F. Sommer;E. J. Mittemeijer .The kinetics of the austenite-ferrite phase transformation of Fe-Mn: differential thermal analysis during cooling[J].Acta materialia,2002(14):3545-3555. |
| [7] | F. Liu;F. Sommer;E. J. Mittemeijer .Determination of nucleation and growth mechanisms of the crystallization of amorphous alloys; application to calorimetric data[J].Acta materialia,2004(11):3207-3216. |
| [8] | Wang, DJ;Liu, YC;Bao, C;Tan, WX;Gao, ZM .Approaches for isochronal transformation kinetics model and their application to the crystallization of amorphous alloys[J].Applied physics, A. Materials science & processing,2009(3):721-729. |
| [9] | Liu YC;Sommer F;Mittemeijer EJ .The austenite-ferrite transformation of ultralow-carbon Fe-C alloy; transition from diffusion- to interface-controlled growth[J].Acta materialia,2006(12):3383-3393. |
| [10] | Doherty R D;Hughes D A .Current issues in recrystallization:a review[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,1997,238:219-274. |
| [11] | Molodov D A;Czubayko U;Gottstein G et al.Mobility of 《 111 》 tilt grain boundaries in the vicinity of the special misorientation ∑ = 7 in bicrystals of pure aluminium[J].Scripta Metallurgica et Materialia,1995,32:529-534. |
| [12] | G. Gottstein;D. A. Molodov;M. Winning;L. S. Shvindlerman .Grain Boundary Dynamics: A Novel Tool for Microstructure Control[J].Interface science,2001(3/4):297-306. |
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