X65管线厚板控冷过程的热力耦合计算与翘曲分析  

Thermo-Mechanical Coupling Computation and Warping Analysis During Controlled-Cooling of X65 Heavy Pipeline-Plate

作　　者：张德丰[1,2] 陆建生[3] 吕建国[3] 宋鹏[3] 

机构地区：[1]昆明冶金高等专科学校教务处,云南昆明650033 [2]奥地利雷欧苯矿业大学力学所 [3]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《中北大学学报（自然科学版）》2013年第1期79-85,共7页Journal of North University of China(Natural Science Edition)

基　　金：奥地利AD项目

摘　　要：通过开发线性混合热膨胀模型、拓展Avrami相变动力学模型和应用Leblond相变诱导塑性(TRIP)模型建立了热力耦合有限元模型,考虑了热膨胀、相变膨胀、相变诱导塑性.用该模型定量分析了X65管线厚板控制冷却时相变潜热、TRIP效应对温度、残余应力的影响,研究了3种控冷工艺下材料的翘曲.结果表明:在层流冷却系数为1mW/(mm2.K)的上下对称控冷时,相变期间潜热减缓心部冷速达52.3%,潜热和TRIP效应分别产生峰值为119MPa,-91MPa和87MPa,-60MPa的应力以减小整体残余应力;上表面层流冷却系数由1mW/(mm2.K)分别增至2mW/(mm2.K),3mW/(mm2.K)后,上表面和心部的温差由107℃分别增至192℃,253℃,该侧残余拉应力的峰值由338MPa减至150MPa,翘曲量由0分别增至0.05×10-3,1.7×10-3.A thermo-mechanical coupled finite element model was established,which combined the linear mixture thermal expansion model,the modified Avrami transformation dynamics model,and the Leblond transformation induced plasticity（TRIP） model.This coupled model considered thermal expansion,transformation dilatation and TRIP effect.The effect of latent heat and TRIP on the temperature and residual stresses of X65 heavy pipeline-plate was quantitatively analyzed.The warping of the plate was investigated under the condition of three kinds of controlled-cooling procedures.The result shows that latent-heat slows the cooling speed to 52.3% at the inner layer part of the plate during phase transformation when a symmetric controlled-cooling with laminar-cooling-coefficient is 1 mW/（mm^2·K） on both surfaces of the plate.The latent heat and TRIP effect induce the peak residual stresses 119 MPa and-91 MPa,87 MPa and-60 MPa,respectively,which reduce the total residual stresses in the plate.The temperature difference between top surface and inner layer is enlarged from 107 ℃ to 192 ℃,253 ℃ if the laminar-cooling-coefficient on top surface increases from 1 mW/（mm^2·K） to 2 mW/（mm^2·K）,3 mW/（mm^2·K）.The peak residual tensile stresses between top surface and inner layer are reduced from 338 MPa to 150 MPa simultaneously.As a result,the warping is increased from 0 to 0.05×10^-3,1.7×10^-3.

关 键 词：相变诱导塑性 热力耦合 相变膨胀 X65管线厚板 控制冷却 翘曲 

分 类 号：TG142.4[一般工业技术—材料科学与工程]