核电汽轮机低压焊接转子热处理残余应力的数值分析  

Influence of Heat Treatment on Residual Stress in LP Welded Rotor of Nuclear Steam Turbines

作　　者：喻超[1] 王炜哲[1] 陈钢 蒋浦宁 

机构地区：[1]上海交通大学机械与动力工程学院,动力机械与工程教育部重点实验室,上海200240 [2]上海电气电站设备有限公司上海汽轮机厂,上海200240

出　　处：《动力工程学报》2014年第1期19-24,31,共7页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(50906049)

摘　　要：利用ABAQUS建立了大型核电低压转子焊接轴对称有限元模型,基于ABAQUS子程序DFLUX编制了焊接热源模型,实现了焊接过程的数值模拟,并通过计算分析获得焊缝区域的残余应力分布规律,探讨了热处理对焊接残余应力分布规律的影响.结果表明:焊接残余应力分布局限于焊缝及其影响区,总体上关于焊缝对称分布,对转子其他部位应力分布未产生影响;热处理后,转子外表面上焊缝无双向拉伸的应力状态,残余高应力分布于焊缝中部位置;热处理工艺对降低焊缝残余应力峰值及应力梯度效果显著.An axisymmetric finite element model for LP welded rotor of large nuclear steam turbine was es- tablished using commercial package ABAQUS, while a welding heat source model set up with DFLUX subroutine in ABAQUS, based on which numerical simulations were performed to the welding process, and subsequently relevant calculation and analysis were carried out to the residual stress distribution in the weld zone, so as to analyze the influence of heat treatment on the residual stress distribution. Results show that the welding residual stress lies only in the weld and heat affected zone, distributing symmetrically a bout the weld, without influencing the stress distribution in other areas of rotor~ after heat treatment, no biaxial tensile stress is found on the weld surface, and high residual stress distributes along the center line of the weld~ heat treatment has a significant effect on peak value and gradient of the residual stress.

关 键 词：核电汽轮机 焊接转子 热源模型 热处理 残余应力 有限元 

分 类 号：TK263[动力工程及工程热物理—动力机械及工程]