镍基合金管道环形焊接与焊后热处理模拟  

Numerical Simulation of Pipe Girth Welding and Post-weld Heat Treatment of Nickel-based Alloy

作　　者：吕刘帅 张小春[1] 苏博 王纳秀[1] LYU Liushuai;ZHANG Xiaochun;SU Bo;WANG Naxiu(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049

出　　处：《热加工工艺》2021年第3期128-133,共6页Hot Working Technology

基　　金：中国科学院战略先导专项项目(XDA02010000)。

摘　　要：对镍基合金管道环形焊缝进行焊接与焊后热处理模拟,为镍基合金焊接后处理工艺的优化提供有意义的参考。首先利用ABAQUS软件进行环形焊接模拟,考察管壁厚一定,随内径厚度比(D/B)变化时,轴向与周向焊接残余应力变化趋势;随后依据Norton蠕变准则,选取合适的蠕变激活能,考察相同保温时间下,不同保温温度对降低焊接残余应力的影响。焊接模拟结果显示,随着D/B值的增大,轴向焊接残余应力整体变化不明显,外表面有变小趋势,内表面有增大趋势,周向焊接残余应力变化明显,尤其是内表面,由压应力变成了拉应力。焊接后热处理模拟结果显示,对于同一种材料,适当升高保温温度可以在短时间内有效降低残余应力。Numerical simulation of pipe girth welding and the post-weld heat treatment of nickel-based alloy was carried out, which provides a meaningful reference for the optimization of nickel-based alloy post-weld treatment process. Firstly, the ABAQUS software was used to simulate the girth welding and to investigate the trend of residual stress in axial and circumferential direction with the change of D/B and constant pipe thickness. Then according to the Norton creep criterion, the appropriate creep activation energy was selected to investigate the influence of different holding temperature on reducing the residual stress with same holding time. The welding simulation results show that the overall variation of axial residual stress is not obvious with the increase of D/B, The axial residual stress on outer surface has a decrease tendency, the one on inner surface has a increase tendency, while the circumferential residual stress changes obviously, especially the inner surface, the compressive stress becomes tensile stress. The post-weld heat treatment simulation shows that for the same material residual stress can be effectively reduced in a short time with the holding temperature appropriately rising.

关 键 词：镍基合金 环形焊 焊接数值模拟 焊后热处理 

分 类 号：TG441.8[金属学及工艺—焊接]