50Cr5NiMoV钢奥氏体分解动力学模型建立与应用
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摘要
测量了50Cr5NiMoV钢的等温膨胀曲线,研究了等温膨胀曲线中孕育期的读取误差对拟合相变动力学参数n的影响,提出了一种获得参数n的方法,建立了50Cr5NiMoV钢的等温奥氏体分解相变动力学模型。应用叠加原理预测连续冷却条件下奥氏体分解相变体积分数,借助连续冷却膨胀曲线对模型参数进行了验证。同时,利用该模型,基于商用ABAQUS软件,对50Cr5NiMoV支承辊热处理过程进行了温度-组织模拟。研究结果表明,该模型能够准确地预测支承辊热处理过程中显微组织演变规律。
The isothermal expansion curve of 50 Cr5 NiMoV steel had been measured. The influence of the reading error of incubation time in isothermal expansion curve on fitting phase transformation kinetic parameter n had been studied, and a method to obtain the parameter n had been put forward. A kinetic model for isothermal austenite decomposition transformation of 50 Cr5 NiMoV steel was established. The volume fraction of austenite decomposition phase transformation under continuous cooling was predicted by superposition principle, and the model parameters were verified by means of continuous cooling expansion curve. At the same time, by using this model and commercial ABAQUS software, the temperature-microstructure simulation of the 50 Cr5 NiMoV back-up roll during heat treatment was carried out. The results show that the model can accurately predict the microstructure evolution of the 50 Cr5 NiMoV back-up roll during heat treatment.
The isothermal expansion curve of 50 Cr5 NiMoV steel had been measured. The influence of the reading error of incubation time in isothermal expansion curve on fitting phase transformation kinetic parameter n had been studied, and a method to obtain the parameter n had been put forward. A kinetic model for isothermal austenite decomposition transformation of 50 Cr5 NiMoV steel was established. The volume fraction of austenite decomposition phase transformation under continuous cooling was predicted by superposition principle, and the model parameters were verified by means of continuous cooling expansion curve. At the same time, by using this model and commercial ABAQUS software, the temperature-microstructure simulation of the 50 Cr5 NiMoV back-up roll during heat treatment was carried out. The results show that the model can accurately predict the microstructure evolution of the 50 Cr5 NiMoV back-up roll during heat treatment.
引文
[1] Avrami M.Kinetics of phase change.Ⅰgeneral theory[J].Journal of Chemical Physics,1939,7(12):1103-1112.
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[16] Hawbolt E B.Kinetics of austenite-ferrite and austenite-pearlite transformations in a 1025 carbon steel[J].Metallurigical Transactions A.1985,V16A(4):565-578.
[17] Zhu Y T,Lowe T C.Application of,and precautions for the use of the rule of additivity in phase transformation[J].Metallurgical and Materials Transactions B,2000,31(4):675-682.
[18] Song X Y,Zhang X J,Fu L C,et al.Evaluation of microstructure and mechanical properties of 50Cr5NiMoV steel for forged backup roll[J].Materials Science and Engineering A,2016,677(20):465-473.
[2] Avrami M.Kinetics of phase change.ⅡTransformation time relations for random distribution of nuclei[J].Journal of Chemical Physics,1940,8(212):212-224.
[3] Avrami M.Granulation,phase change,and microstructure kinetics of phase change.Ⅲ[J].Journal of Chemical Physics,1941,9 (177):177-184.
[4] Serajzadeh S.Modelling of temperature history and phase transformations during cooling of steel[J].Journal of Materials Processing Technology,2004,146 (3):311-317.
[5] Anufriev N P,Maisuradze M V,Yudin Y V.Numerical simulation of structural transformations in hypoeutectoid low-alloy steels[J].Metal Science and Heat Treatment,2011,53(3/4):190-194.
[6] Christian J W.The Theory of Transformations in Metals and Alloys[M].Pergamon Press,Oxford,Unitied Kingdom,1965:399-495.
[7] Raju S,Mohandas E.Kinetics of solid state phase transformations[J].Measurement and Modelling of Some Basic Issues.J.Chem.Sci.,2010,122(1):83-89.
[8] Michael T,Todinov.Alternative approach to the problem of additivity[J].Metallurgical and Materials Transactions B,1998,29(1):269-273.
[9] Umemoto M,Horiuchi K,Tamura.Transformation kinetics of bainite during isothermal holding and continuous cooling[J].Trans.ISIJ,1982,22(11):1193-98.
[10] Fang l,Wood W E,Atteridge D G.Identification and range quantification of steel transformation products by transformation kinetics[J].Metallurgical and Materials Transactions A,1997,28(1):3-14.
[11] Sun N X,Liu X D,Lu K.An explanation to the anomalous avrami exponent[J].Scripta Materialia,1996,34(8):1201-1207.
[12] Khan S A,Bhadeshia H K D H.The bainite transformation in chemically heterogeneous 300M high-strength steel[J].Metallurigical Transactions,1990,21(3):859-875.
[13] Yudin Y V,Farber V M.Characteristic features of the kinetics of decomposition of supercooled austenite of alloy steels in the pearlite range[J].Metal Science and Heat treatment,2001,43(1/2):45-50.
[14] Umemoto M,Horiuchi K,Tamura.Transformation kinetics of bainite during isothermal holding and continuous cooling[J].Trans.ISIJ,1982(22):1193-98.
[15] Hawbolt E B,B.Chau,and J.K.Brimacombe.Kinetics of austenite-pearlite transformation in eutectoid carbon steel[J].Metallurgical Transactions A.1983,14(9):1803-1815.
[16] Hawbolt E B.Kinetics of austenite-ferrite and austenite-pearlite transformations in a 1025 carbon steel[J].Metallurigical Transactions A.1985,V16A(4):565-578.
[17] Zhu Y T,Lowe T C.Application of,and precautions for the use of the rule of additivity in phase transformation[J].Metallurgical and Materials Transactions B,2000,31(4):675-682.
[18] Song X Y,Zhang X J,Fu L C,et al.Evaluation of microstructure and mechanical properties of 50Cr5NiMoV steel for forged backup roll[J].Materials Science and Engineering A,2016,677(20):465-473.