陆书萌,万莉,卜恒勇,李绍宏,李萌蘖,熊茹,郑善举

• 1:昆明理工大学材料科学与工程学院
• 2:中国核动力研究设计院反应堆燃料及材料重点实验室

摘要(Abstract)：

采用DIL 805A动态热膨胀相变仪研究了SA508 Gr.4N钢贝氏体的TTT曲线和等温相变动力学。结果表明：试验钢的等温贝氏体相变动力学符合Johnson-Mehl型方程，最大相变速率随等温温度的升高而减小。试验钢的贝氏体转变温度区间为360～450℃,最大贝氏体转变量随等温温度的升高而降低。结合热膨胀曲线和室温下的组织分析表明，SA508 Gr.4N钢贝氏体转变不完全，等温结束后未转变的奥氏体在冷却过程中转变为M-A岛。在等温温度高于450℃保温6 h的过程中无珠光体和铁素体相变发生，当等温温度低于M_s点时先发生马氏体相变，随后在等温过程中发生贝氏体转变。

关键词(KeyWords)： SA508 Gr.4N钢;贝氏体;等温转变;相变动力学

Abstract:

Keywords:

基金项目(Foundation): 反应堆燃料及材料重点试验室开发基金(STRFML-2020-03);; 云南省基础研究计划项目(202101AU070152)

作者(Author): 陆书萌,万莉,卜恒勇,李绍宏,李萌蘖,熊茹,郑善举

DOI: 10.13289/j.issn.1009-6264.2021-0444

参考文献(References)：

• [1] 刘正东.钢铁材料技术国产化是实现核电产业自主化的基础[J].中国冶金，2008,18(11):1-3.LIU Zheng-dong.Localization of steel technologies is solid basis of proprietary intellectual property of nuclear power industries[J].China Metallurgy,2008,18(11):1-3.
• [2] 何西扣，刘正东，赵德利，等.中国核压力容器用钢及其制造技术进展[J].中国材料进展，2020,39(7):509-518.HE Xi-kou,LIU Zheng-dong,ZHAO De-li,et al.Progress on nuclear pressure vessel steels and its manufacturing technology in china[J].Materials China,2020,39(7):509-518.
• [3] 何西扣，李昌义，刘正东，等.反应堆压力容器用低合金钢平衡相热力学计算与分析[J].金属热处理，2013,38(5):14-17.HE Xi-kou,LI Chang-yi,LIU Zheng-dong,et al.Thermodynamic calculation and analysis on equilibrium phase in low alloy steel for reactor pressure vessel[J].Heat Treatment of Metals,2013,38(5):14-17.
• [4] Pous-Romero H,Bhadeshia H.Continuous cooling transformations in nuclear pressure vessel steels[J].Metallurgical and Materials Transactions A,2014,45(11):4897-4906.
• [5] 李昌义，刘正东，林肇杰，等.反应堆压力容器用钢的淬透性问题[J].材料热处理学报，2011,32(6):68-72.LI Chang-yi,LIU Zheng-dong,LIN Zhao-jie,et al.Hardenability of nuclear reactor pressure vessel steels[J].Transactions of Materials and Heat Treatment,2011,32(6):68-72.
• [6] ASTM SA-508/SA-508M.Specification for quenched and tempered vacuum-treated carbon and alloy steel forgings for pressure vessels[S].ASTM International,West Conshohocken,PA,2004:939-948.
• [7] Park S G,Lee K H,Min K D,et al.Influence of the thermodynamic parameters on the temper embrittlement of SA508 Gr.4N Ni-Cr-Mo low alloy steel with variation of Ni,Cr and Mn contents[J].Journal of Nuclear Materials,2012,426(13):1-8.
• [8] Park S G,Kim M C,Lee B S,et al.Correlation of the thermodynamic calculation and the experimental observation of Ni-Mo-Cr low alloy steel changing Ni,Mo,and Cr contents[J].Journal of Nuclear Materials,2010,407(2):126-135.
• [9] 刘宁，刘正东，何西扣，等.核压力容器用SA508Gr.4N钢加热过程中的奥氏体相变[J].金属热处理，2017,42(3):88-92.LIU Ning,LIU Zheng-dong,HE Xi-kou,et al.Austenite transformation of SA508Gr.4N steel for nuclear reactor pressure vessels during heating process[J].Heat Treatment of Metals,2017,42(3):88-92.
• [10] 刘宁.核电压力容器用SA508Gr.4N钢热变形与热处理工艺研究[D].昆明：昆明理工大学，2017.LIU Ning.Study on thermal deformation and heat treatment of SA508Gr.4N steel for nuclear power pressure vessel[D].Kunming:Kunming University of Science and Technology,2017.
• [11] Liu N,Liu Z D,He X K,et al.Hot deformation behavior of SA508GR.4N steel for nuclear reactor pressure vessels[J].Journal of Iron and Steel Research(International),2016,23(12):1342-1348.
• [12] Lee K H,Park S G,Kim M C,et al.Characterization of transition behavior in SA508 Gr.4N Ni-Cr-Mo low alloy steels with microstructural alteration by Ni and Cr contents[J].Materials Science and Engineering A,2011,529:156-163.
• [13] 周超.核电站反应堆压力容器用SA508-4Ni-Cr-Mo钢的组织和性能研究[D].天津：天津大学，2012.ZHOU Chao.Structure and properties of SA508-4Ni-Cr-Mo steel for reactor pressure vessel[D].Tianjin:Tianjin University,2012.
• [14] Hehemann R F,Kinsman K R,Aaronson H I.A debate on the bainite reaction[J].Metallurgical Transactions,1972,3(5):1077-1094.
• [15] Hehemann R F,Troiano A R.The bainite transformation[J].Metal Progress,1956,70:97-104.
• [16] Steven W.The temperature of formation of martensite and bainite in low alloy steels,some effects of chemical composition[J].Journal of the Iron and Steel Institute,1956,183:349-359.
• [17] Trzaska J.Calculation of critical temperatures by empirical formulae[J].Archives of Metallurgy and Materials,2016,61(2):981-986.
• [18] Kirkaldy J S.Prediction of microstructure and hardenability in low alloy steels[C]//Proceedings of the International Conference on Phase Transformation in Ferrous Alloys,1983:125-148.
• [19] Lee Y K.Empirical formula of isothermal bainite start temperature of steels[J].Journal of Materials Science Letters,2002,21(16):1253-1255.
• [20] Bodnar R L,Ohhashi T,Jaffee R I.Effects of Mn,Si,and purity on the design of 3.5NiCrMoV,1CrMoV,and 2.25Cr-1Mo bainitic alloy steels[J].Metallurgical Transactions A,1989,20(8):1445-1460.
• [21] Li M V,Niebuhr D V,Meekisho L L,et al.A computational model for the prediction of steel hardenability[J].Metallurgical and Materials Transactions B,1998,29(3):661-672.
• [22] Zhao Z B,Liu C,Liu Y X,et al.A new empirical formula for the bainite upper temperature limit of steel[J].Journal of Materials Science,2001,36(20):5045-5056.
• [23] Zhao J C.Continuous cooling transformations in steels[J].Materials Science and Technology,1992,8(11):997-1003.
• [24] Trzaska J.Empirical formulae for the calculation of austenite supercooled transformation temperatures[J].Archives of Metallurgy and Materials,2015,60(1):181-185.
• [25] Koistinen D P,Marburger R E.A general equation prescribing the extent of the austenite - martensite transformation in pure iron -carbon alloys and plain carbon steels[J].Acta Metallurgica,1959,7(1):59-60.
• [26] Johnson W A,Mehl R F.Reaction kinetics in process of nucleation and growth[J].Transaction of AIME,1939,135:416-442.
• [27] Avrami M.Kinetics of phase change.II transformation-time relations for random distribution of nuclei[J].The Journal of Chemical Physics,1940,8(2):212-224.
• [28] John W C.The kinetics of grain boundary nucleated reactions[J].Acta Metallurgica,1956,4(5):449-459.

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