石油套管淬火冷却中三维耦合场的有限元模拟  

FEM simulation of 3-dimensional coupled field for oil casing in quenching process

作　　者：李亚欣[1,2] 刘雅政[1] 周乐育[1] 李阳华 邹喜洋 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京科技大学中冶技术发展有限公司,北京100029 [3]衡阳华菱钢管(集团)有限公司技术中心,湖南衡阳421001

出　　处：《材料热处理学报》2011年第1期155-161,共7页Transactions of Materials and Heat Treatment

摘　　要：建立了石油套管在淬火冷却过程中温度、应力场的三维非线性热力耦合有限元模型,并分析了温度、应力场的变化规律和分布状态。模拟结果表明:冷却过程中,轴截面沿径向的温差先增加后减小,冷却2.5 s时,温差最大为274℃。冷却至5.5 s时,外表面首先开始发生马氏体转变;当冷却至11.5 s时,套管整体温度≤280℃,几乎完成了马氏体转变。套管切向应力对套管影响作用最明显,在冷却初期,热应力作用使切向应力随温差增大而升高,减小而降低;发生组织转变后,热应力和组织应力共存,随冷却进行切向应力迅速升高,至7.5 s达到最大为561 MPa;完成组织转变后,只有热应力存在,随冷却进行温差减小切向应力亦降低。Finite element model of 3-dimensional nonlinear thermo-mechanical coupled field of oil casing in quenching process was built,and the change and distribution of temperature and stress field was analyzed.The simulated results show that the difference of the radial temperature of axial section firstly increases and then decreases during cooling,and the maximum difference of temperature is 274 ℃ at 2.5 s.The martensite transformation firstly occurs at outside surface of oil casing when cooled to 5.5 s and almost finishes at 11 s,and at this moment the temperature of the oil casing is below 280 ℃.The tangential stress has a significant influence to oil casing.At the initial stage of quenching,the tangential stress changes with the difference of temperature for thermal stress,and in ternal stress consists of thermal stress and phase transformation stress after the phase transformation.The tangential stress increases with cooling,and it maximizes to 561 MPa when cooled to 7.5 s.When the phase transformation finishes,there is only thermal stress,the tangential stress reduces with the decrease of the difference of radial temperature in the course of cooling.

关 键 词：有限元 石油套管 淬火过程 耦合场 

分 类 号：TG156.3[金属学及工艺—热处理]